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Add Repo: LIV2_GottaGoFastRAM

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LIV2_GottaGoFastRAM/.github/workflows/release.yml ADDED
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+ name: Generate release files
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+
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+ permissions:
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+ contents: write
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+ on:
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+ push:
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+ tags:
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+ - "Release_**"
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+ - "Rev**"
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+ - "Proto**"
11
+ - "proto**"
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+ workflow_dispatch:
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+
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+ jobs:
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+ draft_release:
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+ runs-on: ubuntu-latest
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+
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+ steps:
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+ - name: Checkout
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+ uses: actions/checkout@v3
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+ - name: release
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+ uses: softprops/action-gh-release@v1
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+ with:
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+ draft: true
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+ files: |
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+ Binaries/*.jed
LIV2_GottaGoFastRAM/Images/wavedrom-waveforms.txt ADDED
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+ # Used on wavedrom.com to generate timing diagrams
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+
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+ {signal: [
4
+ {name: 'State', wave: 'xx=========x', period: 0.5, data: "0 1 2 3 4 5 6 7 0",},
5
+ {name: 'CLK', wave: 'P.....',},
6
+ {name: 'ADDR', wave: 'xxx=......xx', period: 0.5, data: "Match"},
7
+ {name: 'AS', wave: '1...0....1..', period:0.5},
8
+ {name: 'DS', wave: '1...0....1..', period:0.5},
9
+ {name: 'RW', wave: '0.1.........', period:0.5},
10
+ {name: 'BUFFER_OE', wave: '1....0...1..', period:0.5},
11
+ {name: 'WR', wave: '1...........', period:0.5},
12
+ {name: 'DATA', wave: 'x.......=.x.', period:0.5},
13
+ {name: 'MADDR', wave: 'x...=..=..xx',period:0.5, data: "Row Column"},
14
+ {name: 'RAS', wave: '1...010...1.',period:0.5},
15
+ {name: 'CAS', wave: '1..0.1..0.1.',period:0.5},
16
+ ],
17
+ head:{text:'Read Cycle', tock: 0,},
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+ config: {hscale: 2}}
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+
20
+
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+ {signal: [
22
+ {name: 'State', wave: 'xx=========x', period: 0.5, data: "0 1 2 3 4 5 6 7 0",},
23
+ {name: 'CLK', wave: 'P.....',},
24
+ {name: 'ADDR', wave: 'xxx=......xx', period: 0.5, data: "Match"},
25
+ {name: 'AS', wave: '1...0....1..', period:0.5},
26
+ {name: 'DS', wave: '1.....0..1..', period:0.5},
27
+ {name: 'RW', wave: '1...0.....1.', period:0.5},
28
+ {name: 'BUFFER_OE', wave: '1.....0..1..', period:0.5},
29
+ {name: 'WR', wave: '1.....0..1..', period:0.5},
30
+ {name: 'DATA', wave: 'x....=....xx', period:0.5},
31
+ {name: 'MADDR', wave: 'x...=..=..xx',period:0.5, data: "Row Column"},
32
+ {name: 'RAS', wave: '1...010...1.',period:0.5},
33
+ {name: 'CAS', wave: '1..0.1..0.1.',period:0.5},
34
+ ],
35
+ head:{text:'Write Cycle', tock: 0,},
36
+ config: {hscale: 2}}
LIV2_GottaGoFastRAM/LICENSE.md ADDED
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+ CERN Open Hardware Licence v1.2
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LIV2_GottaGoFastRAM/README.md ADDED
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1
+ # GottaGoFastRAM 8MB Autoconfig Fast RAM
2
+
3
+ This is an 8MB Autoconfig Fast RAM for Amiga 500/1000/2000/CDTV based on mkl's mem68k
4
+ It's small size allows it to be stacked on top of an ide68k board
5
+ Rather than use the original mem68k Abel code I have written a new memory controller in Verilog
6
+
7
+ ![PCB](Images/pcb.png?raw=True)
8
+ ![Assembled](Images/assembled.jpg?raw=True)
9
+ ## Table of contents
10
+ 1. [PCB Ordering](#ordering-pcbs)
11
+ 2. [Mounting Options](#mounting-options)
12
+ 3. [Cfgin/out](#cfginout)
13
+ 4. [Jumpers](#jumpers)
14
+ 5. [CDTV](#cdtv)
15
+ 6. [Timing Diagrams](#timing-diagrams)
16
+ 7. [Bill of materials](#bill-of-materials)
17
+ 8. [Known Issues](#known-issues)
18
+ 9. [Experimental firmware](#experimental-firmware)
19
+
20
+ ## Ordering PCBs
21
+ I recommend ordering the PCB with a 0.6 or 0.8mm thickness if you intend on stacking with an ide68k or mouting using a DIP socket/machined pin strips.
22
+ If you are going to mount using the socket pins and not stacking with an ide68k I'd recommend going with the usual 1.6mm to reduce flexing.
23
+
24
+ ## Mounting options
25
+
26
+ 1. Can be soldered to the bottom of a machined pin socket/machined pin strips (will require some cutting of the dip socket to fit the caps/ferrites near the plastic)
27
+ <img src="Images/mounting_strip.jpg" width=300 />
28
+ 2. Can be soldered to socket pins and stacked with an ide68k
29
+ <img src="Images/stacked1.jpg" width=300 />
30
+ <img src="Images/stacked2.jpg" width=300 />
31
+
32
+ ## Cfgin/out
33
+ These pins allow you to insert the memory module into your autoconfig chain.
34
+ If there are no other autoconfig devices in your system you can just leave these unconnected otherwise you will need to either connect CFGOut to the CFGin of the first device in your existing autoconfig chain, or connect CFGIn to the CFGOut pin of the last device in your existing autoconfig chain.
35
+ In the Amiga 2000 you can connect CFGIN to U606 Pin 8 which will add the device to the end of the chain but __NOTE: This takes up the config signal for the leftmost slot (CN601) so do NOT install a Zorro card there__
36
+
37
+ You can also connect cfgin and cfgout with a jumper to disable the device temporarily
38
+
39
+ ## Jumpers
40
+ J1: Cfgin pull up/down (You will probably want to leave this at default unless you know what you're doing)
41
+ J2-3: Bridge these if you have not fitted the buffer U4
42
+
43
+ ## CDTV
44
+ The CDTV's DMAC takes up the first autoconfig slot, so if you intend to use this with a CDTV use the CDTV specific .JED file to program the CPLD
45
+
46
+ If you have a Rev A or Rev B (not B1) board you will need to apply a [small mod for CDTV compatibility](https://github.com/LIV2/GottaGoFastRAM/issues/4/#issuecomment-868977723)
47
+
48
+ ## Timing Diagrams
49
+ ![Read Cycle](Images/read.svg?raw=True)
50
+ ![Write Cycle](Images/write.svg?raw=True)
51
+
52
+ ### Bill of materials
53
+ |Component|Location|QTY|Link|Remarks|
54
+ |---------|--------|---|------|--------|
55
+ |4Mx16 3V DRAM TSSOP - K4E641612D or GM71VS65163 |U3|1|-|eBay/Aliexpress etc.|
56
+ |XC9572XL-10VQ64C|U1|1|[Mouser](https://www.mouser.se/ProductDetail/217-C9572XL-10VQG64C)<br />[DigiKey](https://www.digikey.com/short/2f7qn38b)||
57
+ |74LVC2G17 TSSOP-6/SOT-363|U4|1|[Mouser](https://www.mouser.com/ProductDetail/771-74LVC2G17GVQ100H)<br />[DigiKey](https://www.digikey.com/short/95mn57tt) ||
58
+ |AP2210N-3.3 SOT-23|U5|1|[Mouser](https://www.mouser.com/ProductDetail/621-AP2210N-3.3TRG1)<br />[DigiKey](https://www.digikey.com/short/30rd0zn5)|Maybe can be substituted with MCP1703AT-3302E|
59
+ |74LVC245N TSSOP|U6,U7|2|[Mouser](https://www.mouser.com/ProductDetail/595-SN74LVC245APWRG4)<br />[DigiKey](https://www.digikey.com/short/pnq3wff3)|Can be substituted with SN74LVTH245 or SN74LVCR2245|
60
+ |Ferrite Bead, 1206 package|FB1, FB2|2|[Mouser](https://www.mouser.com/ProductDetail/875-MI1206K601R-10)<br />[DigiKey](https://www.digikey.com/short/n4p04ctv)|Can be substituted with 0 Ohm 1206 resistors|
61
+ |10K Resistor, 0603|R1|1|[Mouser](https://www.mouser.com/ProductDetail/603-RT0603FRD0710KL)<br />[DigiKey](https://www.digikey.com/short/nvvrt5dw)||
62
+ |0.1uF Ceramic Capacitor, 0603|C1,4-13|11|[Mouser](https://www.mouser.com/ProductDetail/80-C603C104K5RAC3121)<br />[DigiKey](https://www.digikey.com/short/f7trtfwt)||
63
+ |4.7uF Ceramic Capacitor, 1206|C2|1|[Mouser](https://www.mouser.com/ProductDetail/187-CL31B475KAHNFNE)<br />[DigiKey](https://www.digikey.com/short/d7mbf5nn)||
64
+ |10uF Ceramic Capacitor, 1206|C3|1|[Mouser](https://www.mouser.com/ProductDetail/187-CL31A106MAHNNNE)<br />[DigiKey](https://www.digikey.com/short/rqt1br0q)||
65
+ |Socket pins|Pins|64|[Aliexpress](https://www.aliexpress.com/item/32791545218.html?spm=a2g0o.productlist.0.0.6e223b55CVrXSq&algo_pvid=8fda9f5a-6e07-4dc8-9ed4-bd809bf75756&algo_expid=8fda9f5a-6e07-4dc8-9ed4-bd809bf75756-0&btsid=2100bde316043149660504011ef819&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_)|Use these if stacking with an ide68k module|
66
+ |64-Pin DIP socket - machined pin|Pins|1|[Mouser](https://www.mouser.com/ProductDetail/575-193964)|If not stacking with ide68k - pcb can be soldered to bottom of this flush with the plastic|
67
+
68
+ ## Known issues
69
+ 1. Rev A & B - Incorrect voltage supplied to U4 causes incompatibility with CDTV. Fixed in Rev B1 but you can [rework Rev A or B boards by following the instructions here](https://github.com/LIV2/GottaGoFastRAM/issues/4/#issuecomment-868977723)
70
+
71
+ ## Experimental Firmware
72
+ * [AutoSnoop Firmware - Autoconfig after all other Z2 devices without any wires](https://github.com/LIV2/GottaGoFastRAM/tree/snoopy)
LIV2_GottaGoFastRAM/RTL/gottagofast.v ADDED
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1
+ /*
2
+ GottaGoFastRAM - 8MB Autoconfig FastRAM for Amiga 500(+)/1000/2000/CDTV
3
+ Copyright 2020 Matthew Harlum
4
+
5
+ This program is free software: you can redistribute it and/or modify
6
+ it under the terms of the GNU General Public License as published by
7
+ the Free Software Foundation, either version 3 of the License, or
8
+ (at your option) any later version.
9
+
10
+ This program is distributed in the hope that it will be useful,
11
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
12
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13
+ GNU General Public License for more details.
14
+
15
+ You should have received a copy of the GNU General Public License
16
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
17
+
18
+ Inspired by mkl's mem68k
19
+ */
20
+
21
+ `ifndef makedefines // The defines ignored if being built by Makefile
22
+ `define SERIAL 32'd421
23
+ `define PRODID 8'1
24
+
25
+ `define autoconfig // If disabled RAM is always mapped to $200000-9FFFFF
26
+ //`define cdtv // Uncomment to build CDTV compatible version
27
+ //`define Offer_6M // If told to shutup when offering 8MB, offer up a 2MB and also 4MB block next (useful with an A590/2091)
28
+ `define rev_b
29
+ `endif
30
+
31
+ module gottagofast(
32
+ input CLK,
33
+ input RESETn,
34
+ input CFGINn,
35
+ input UDSn,
36
+ input LDSn,
37
+ input ASn,
38
+ input RWn,
39
+ inout [15:12] DBUS,
40
+ input [23:1] ADDR,
41
+ output reg [11:0] MADDR,
42
+ output reg CFGOUTn,
43
+ output RASn,
44
+ output UCASn,
45
+ output LCASn,
46
+ output OEn,
47
+ output MEMWn
48
+ );
49
+
50
+ reg reset_delayed1;
51
+ reg reset;
52
+
53
+ // Memory controller
54
+
55
+ reg ram_cycle;
56
+ reg access_ras;
57
+ reg access_ucas;
58
+ reg access_lcas;
59
+ reg refresh_ras;
60
+ reg refresh_cas;
61
+ reg [7:0] addr_match;
62
+
63
+ `ifdef autoconfig
64
+ // Autoconfig
65
+ localparam [15:0] mfg_id = 16'd5194;
66
+ localparam [7:0] prod_id = 8'd1;
67
+ localparam [31:0] serial = `SERIAL;
68
+
69
+ wire autoconfig_cycle;
70
+ reg shutup = 0;
71
+ reg CFGINnr;
72
+ reg configured;
73
+ reg [2:0] autoconfig_state;
74
+ reg [3:0] data_out;
75
+
76
+ localparam Offer_8M = 3'b000,
77
+ // If offering 2MB + 4MB blocks you need to offer the 2MB block first
78
+ // This is because of a kickstart bug where the memory config overflows if there is already 2MB configured before another 4MB then 2MB is configured...
79
+ `ifdef Offer_6M
80
+ Offer_2M = 3'b001,
81
+ Offer_4M = 3'b010,
82
+ `else
83
+ Offer_4M = 3'b001,
84
+ Offer_2M = 3'b010,
85
+ `endif
86
+ Offer_1M = 3'b011,
87
+ SHUTUP = 3'b100;
88
+
89
+ assign DBUS[15:12] = (RESETn & autoconfig_cycle & RWn & !ASn & !UDSn) ? data_out[3:0] : 'bZ;
90
+
91
+ `ifdef cdtv
92
+ reg cdtv_configured;
93
+
94
+ assign autoconfig_cycle = (ADDR[23:16] == 8'hE8) & !CFGINnr & !shutup & cdtv_configured;
95
+ `else
96
+ assign autoconfig_cycle = (ADDR[23:16] == 8'hE8) & !CFGINnr & !shutup;
97
+ `endif
98
+
99
+ `ifdef cdtv
100
+ // CDTV DMAC is first in chain.
101
+ // So we wait until it's configured before we talk
102
+ always @(negedge UDSn or negedge reset)
103
+ begin
104
+ if (!reset) begin
105
+ cdtv_configured <= 1'b0;
106
+ end else begin
107
+ if (ADDR[23:16] == 8'hE8 & ADDR[8:1] == 8'h24 & !ASn & !RWn) begin
108
+ cdtv_configured <= 1'b1;
109
+ end
110
+ end
111
+ end
112
+ `endif
113
+
114
+ // Register Config in/out at end of bus cycle
115
+ always @(posedge ASn or negedge reset)
116
+ begin
117
+ if (!reset) begin
118
+ CFGOUTn <= 1'b1;
119
+ CFGINnr <= 1'b1;
120
+ end else begin
121
+ CFGOUTn <= !shutup;
122
+ CFGINnr <= CFGINn;
123
+ end
124
+ end
125
+
126
+ // Offers an 8MB block first, if there's no space offer 4MB, 2MB then 1MB before giving up
127
+ always @(posedge CLK or negedge reset)
128
+ begin
129
+ if (!reset) begin
130
+ data_out <= 'bZ;
131
+ end else if (autoconfig_cycle & RWn) begin
132
+ case (ADDR[8:1])
133
+ 8'h00: data_out <= 4'b1110;
134
+ 8'h01:
135
+ case (autoconfig_state)
136
+ Offer_8M: data_out <= 4'b0000;
137
+ Offer_4M: data_out <= 4'b0111;
138
+ Offer_2M: data_out <= 4'b0110;
139
+ Offer_1M: data_out <= 4'b0101;
140
+ default: data_out <= 4'b0000;
141
+ endcase
142
+ 8'h02: data_out <= ~prod_id[7:4]; // Product number
143
+ 8'h03: data_out <= ~prod_id[3:0]; // Product number
144
+ 8'h04: data_out <= ~4'b1000;
145
+ 8'h05: data_out <= ~4'b0000;
146
+ 8'h08: data_out <= ~mfg_id[15:12]; // Manufacturer ID
147
+ 8'h09: data_out <= ~mfg_id[11:8]; // Manufacturer ID
148
+ 8'h0A: data_out <= ~mfg_id[7:4]; // Manufacturer ID
149
+ 8'h0B: data_out <= ~mfg_id[3:0]; // Manufacturer ID
150
+ 8'h0C: data_out <= ~serial[31:28]; // Serial number
151
+ 8'h0D: data_out <= ~serial[27:24]; // Serial number
152
+ 8'h0E: data_out <= ~serial[23:20]; // Serial number
153
+ 8'h0F: data_out <= ~serial[19:16]; // Serial number
154
+ 8'h10: data_out <= ~serial[15:12]; // Serial number
155
+ 8'h11: data_out <= ~serial[11:8]; // Serial number
156
+ 8'h12: data_out <= ~serial[7:4]; // Serial number
157
+ 8'h13: data_out <= ~serial[3:0]; // Serial number
158
+ 8'h20: data_out <= 4'b0;
159
+ 8'h21: data_out <= 4'b0;
160
+ default: data_out <= 4'hF;
161
+ endcase
162
+ end
163
+ end
164
+
165
+ always @(negedge UDSn or negedge reset)
166
+ begin
167
+ if (!reset) begin
168
+ configured <= 1'b0;
169
+ shutup <= 1'b0;
170
+ addr_match <= 8'b00000000;
171
+ autoconfig_state <= Offer_8M;
172
+ end else if (autoconfig_cycle & !ASn & !RWn) begin
173
+ if (ADDR[8:1] == 8'h26) begin
174
+ // We've been told to shut up (not enough memory space)
175
+ // Try offering a smaller block
176
+ if (autoconfig_state >= SHUTUP-1) begin
177
+ // All options exhausted - time to shut up!
178
+ shutup <= 1;
179
+ autoconfig_state <= SHUTUP;
180
+ end else begin
181
+ // Offer the next smallest block
182
+ autoconfig_state <= autoconfig_state + 1;
183
+ end
184
+ end
185
+ else if (ADDR[8:1] == 8'h24) begin
186
+ case (autoconfig_state)
187
+ Offer_8M:
188
+ begin
189
+ addr_match <= 8'hFF;
190
+ shutup <= 1'b1;
191
+ end
192
+ Offer_4M:
193
+ begin
194
+ case(DBUS)
195
+ 4'h2: addr_match <= (addr_match|8'b00001111);
196
+ 4'h4: addr_match <= (addr_match|8'b00111100);
197
+ 4'h6: addr_match <= (addr_match|8'b11110000);
198
+ endcase
199
+ shutup <= 1'b1;
200
+ end
201
+ Offer_2M:
202
+ begin
203
+ case(DBUS)
204
+ 4'h2: addr_match <= (addr_match|8'b00000011);
205
+ 4'h4: addr_match <= (addr_match|8'b00001100);
206
+ 4'h6: addr_match <= (addr_match|8'b00110000);
207
+ 4'h8: addr_match <= (addr_match|8'b11000000);
208
+ endcase
209
+ `ifdef Offer_6M
210
+ autoconfig_state <= Offer_4M;
211
+ `else
212
+ shutup <= 1'b1;
213
+ `endif
214
+ end
215
+ Offer_1M:
216
+ begin
217
+ case(DBUS)
218
+ 4'h2: addr_match <= (addr_match|8'b00000001);
219
+ 4'h3: addr_match <= (addr_match|8'b00000010);
220
+ 4'h4: addr_match <= (addr_match|8'b00000100);
221
+ 4'h5: addr_match <= (addr_match|8'b00001000);
222
+ 4'h6: addr_match <= (addr_match|8'b00010000);
223
+ 4'h7: addr_match <= (addr_match|8'b00100000);
224
+ 4'h8: addr_match <= (addr_match|8'b01000000);
225
+ 4'h9: addr_match <= (addr_match|8'b10000000);
226
+ endcase
227
+ shutup <= 1'b1;
228
+ end
229
+ default: addr_match <= 8'b0;
230
+ endcase
231
+ configured <= 1'b1;
232
+ end
233
+ end
234
+ end
235
+ `endif
236
+
237
+ // Memory controller
238
+
239
+ assign RASn = !(access_ras | (refresh_ras & refresh_cas));
240
+ assign UCASn = !((access_ucas) | refresh_cas);
241
+ assign LCASn = !((access_lcas) | refresh_cas);
242
+ `ifdef rev_b // On Rev B OEn drives the buffers
243
+ assign OEn = !ram_cycle | ASn | !RESETn | (UDSn & LDSn);
244
+ `else
245
+ assign OEn = !(RWn & access_ras);
246
+ `endif
247
+ assign MEMWn = RWn | (UDSn & LDSn);
248
+
249
+ // Filter reset line by registering it
250
+ always @(posedge CLK)
251
+ begin
252
+ reset_delayed1 <= RESETn;
253
+ reset <= reset_delayed1;
254
+ end
255
+
256
+ // CAS before RAS refresh
257
+ // CAS Asserted in S1 & S2
258
+ // RAS Asserted in S2
259
+ always @(negedge CLK or negedge reset)
260
+ begin
261
+ if (!reset) begin
262
+ refresh_cas <= 1'b0;
263
+ end else begin
264
+ refresh_cas <= (!refresh_cas & ASn & !access_ras);
265
+ end
266
+ end
267
+
268
+ always @(posedge CLK or negedge reset)
269
+ begin
270
+ if (!reset) begin
271
+ refresh_ras <= 1'b0;
272
+ end else begin
273
+ refresh_ras <= refresh_cas;
274
+ end
275
+ end
276
+
277
+ // Memory access
278
+ always @(negedge CLK or negedge reset)
279
+ begin
280
+ if (!reset) begin
281
+ ram_cycle = 1'b0;
282
+ end else begin
283
+ `ifdef autoconfig
284
+ ram_cycle = (
285
+ ((ADDR[23:20] == 4'h2) & addr_match[0]) |
286
+ ((ADDR[23:20] == 4'h3) & addr_match[1]) |
287
+ ((ADDR[23:20] == 4'h4) & addr_match[2]) |
288
+ ((ADDR[23:20] == 4'h5) & addr_match[3]) |
289
+ ((ADDR[23:20] == 4'h6) & addr_match[4]) |
290
+ ((ADDR[23:20] == 4'h7) & addr_match[5]) |
291
+ ((ADDR[23:20] == 4'h8) & addr_match[6]) |
292
+ ((ADDR[23:20] == 4'h9) & addr_match[7])
293
+ ) & !ASn & configured;
294
+ `else
295
+ ram_cycle = ((ADDR[23:20] >= 4'h2) & (ADDR[23:20] <= 4'h9) & !ASn);
296
+ `endif
297
+ end
298
+ end
299
+
300
+ always @(posedge CLK or negedge reset)
301
+ begin
302
+ if (!reset) begin
303
+ access_ras <= 1'b0;
304
+ access_ucas <= 1'b0;
305
+ access_lcas <= 1'b0;
306
+ end else begin
307
+ access_ras <= (ram_cycle & !access_ucas & !access_lcas); // Assert @ S4, Deassert @ S0
308
+ access_ucas <= (access_ras & !access_ucas & !UDSn); // Assert @ S6, Deassert @ S0
309
+ access_lcas <= (access_ras & !access_lcas & !LDSn); // Assert @ S6, Deassert @ S0
310
+ end
311
+ end
312
+
313
+ // Row/Col mux
314
+ // Switch to ROW address at falling edge of S0
315
+ // Switch to column address at falling edge of S4
316
+ always @(negedge CLK)
317
+ begin
318
+ if (!access_ras) begin
319
+ MADDR[11:0] <= ADDR[22:11]; // Row Address
320
+ end else begin
321
+ MADDR[11:10] <= 2'b00;
322
+ MADDR[9:0] <= ADDR[10:1]; // Column Address
323
+ end
324
+ end
325
+
326
+ endmodule
LIV2_GottaGoFastRAM/Rev_A/LICENSE.md ADDED
@@ -0,0 +1,189 @@
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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LIV2_GottaGoFastRAM/Rev_A/README.md ADDED
@@ -0,0 +1,48 @@
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
+ # GottaGoFastRAM 8MB Autoconfig Fast RAM
2
+
3
+ This is an 8MB Autoconfig Fast RAM for Amiga 500/1000/2000/CDTV based on mkl's mem68k
4
+ It's small size allows it to be stacked on top of an ide68k board
5
+ Rather than use the original mem68k Abel code I have written a new memory controller in Verilog
6
+
7
+ Unfortunately the memory modules are hard to find, I was able to get some by scouring eBay for some 16/32MB simms and looking for ones pictured with the right ram modules - If you see a 16/32MB simm with 2/4 50-pin TSSOP modules then they're probably the right ones
8
+
9
+ ![PCB](Images/pcb.png?raw=True)
10
+
11
+ ## PCB Ordering
12
+ I recommend ordering the PCB with a 0.6 or 0.8mm thickness if you intend on stacking with an ide68k or mouting using a DIP socket/machined pin strips.
13
+ If you are going to mount using the socket pins and not stacking with an ide68k I'd recommend going with the usual 1.6mm to reduce flexing.
14
+
15
+ ## Mounting options
16
+
17
+ 1. Can be soldered to the bottom of a machined pin socket/machined pin strips (will require some cutting of the dip socket to fit the caps/ferrites near the plastic)
18
+ 2. Can be soldered to socket pins and stacked with an ide68k
19
+
20
+ ## Cfgin/out
21
+ These pins allow you to insert the memory module into your autoconfig chain.
22
+ If there are no other autoconfig devices in your system you can just leave these unconnected otherwise you will need to either connect CFGOut to the CFGin of the first device in your existing autoconfig chain, or connect CFGIn to the CFGOut pin of the last device in your existing autoconfig chain.
23
+ You can also connect cfgin and cfgout with a jumper to disable the device temporarily
24
+
25
+ ## Jumpers
26
+ J1: Cfgin pull up/down (You will probably want to leave this at default unless you know what you're doing)
27
+ J2-3: Bridge these if you have not fitted the buffer U4
28
+
29
+ ## CDTV
30
+ The CDTV's DMAC takes up the first autoconfig slot, so if you intend to use this with a CDTV use the CDTV specific .JED file to program the CPLD
31
+
32
+ ## Timing Diagrams
33
+ ![Read Cycle](Images/read.svg?raw=True)
34
+ ![Write Cycle](Images/write.svg?raw=True)
35
+
36
+ ### Bill of materials
37
+ |Component|Location|QTY|Link|Remarks|
38
+ |---------|--------|---|------|--------|
39
+ |4Mx16 5V DRAM - KM416C4100|U3|1|-|Look for 16MB SIMMs on eBay which show only 2 tssop package RAMs|
40
+ |XC9572XL-10VQ64C|U1|1|[Mouser](https://www.mouser.se/ProductDetail/217-C9572XL-10VQG64C)||
41
+ |74LVC2G17|U4|1|[Mouser](https://www.mouser.com/ProductDetail/771-74LVC2G17GVQ100H)||
42
+ |AP2210N-3.3|U5|1|[Mouser](https://www.mouser.com/ProductDetail/621-AP2210N-3.3TRG1)||
43
+ |Ferrite Bead, 1206 package|FB1, FB2|2|[Mouser](https://www.mouser.com/ProductDetail/875-MI1206K601R-10)||
44
+ |0.1uF Ceramic Capacitor, 0603|C1,4-11|9|[Mouser](https://www.mouser.com/ProductDetail/80-C603C104K5RAC3121)||
45
+ |4.7uF Ceramic Capacitor, 1206|C2,C12|2|[Mouser](https://www.mouser.com/ProductDetail/791-1206X475K160CT)||
46
+ |10uF Ceramic Capacitor, 1206|C3|1|[Mouser](https://www.mouser.com/ProductDetail/80-C1206C106K4R)||
47
+ |Socket pins|Pins|64|[Aliexpress](https://www.aliexpress.com/item/32791545218.html?spm=a2g0o.productlist.0.0.6e223b55CVrXSq&algo_pvid=8fda9f5a-6e07-4dc8-9ed4-bd809bf75756&algo_expid=8fda9f5a-6e07-4dc8-9ed4-bd809bf75756-0&btsid=2100bde316043149660504011ef819&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_)|Use these if stacking with an ide68k module|
48
+ |64-Pin DIP socket - machined pin|Pins|1|[Mouser](https://www.mouser.com/ProductDetail/575-193964)|If not stacking with ide68k - pcb can be soldered to bottom of this flush with the plastic|