| // Licensed to the Apache Software Foundation (ASF) under one | |
| // or more contributor license agreements. See the NOTICE file | |
| // distributed with this work for additional information | |
| // regarding copyright ownership. The ASF licenses this file | |
| // to you under the Apache License, Version 2.0 (the | |
| // "License"); you may not use this file except in compliance | |
| // with the License. You may obtain a copy of the License at | |
| // | |
| // http://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, | |
| // software distributed under the License is distributed on an | |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
| // KIND, either express or implied. See the License for the | |
| // specific language governing permissions and limitations | |
| // under the License. | |
| // | |
| // Description: Wrapper for Apple Integer Basic ROM | |
| // | |
| // Author.....: Alan Garfield | |
| // Niels A. Moseley | |
| // Date.......: 26-1-2018 | |
| // | |
| module rom_basic #( | |
| parameter BASIC_FILENAME = "../../../roms/basic.hex" | |
| ) ( | |
| input clk, // clock signal | |
| input [11:0] address, // address bus | |
| output reg [7:0] dout // 8-bit data bus (output) | |
| ); | |
| reg [7:0] rom_data[0:4095]; | |
| initial | |
| $readmemh(BASIC_FILENAME, rom_data, 0, 4095); | |
| always @(posedge clk) | |
| dout <= rom_data[address]; | |
| endmodule | |