78 lines
2.2 KiB
JavaScript
78 lines
2.2 KiB
JavaScript
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/**
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* EEPROM Component.
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*
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* This is basically a RAM component that persists its contents.
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*
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* We consider EEPROMs more 'expensive' than RAMs, so we arbitrarily limit
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* the addressWith to a maximum of 10 bits (1024 addresses) with a default of 8-bit (256).
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*
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* In the EEPROM all addresses are initialized to zero.
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* This way we serialize unused values as "0" instead of "null".
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*
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* These two techniques help keep reduce the size of saved projects.
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*/
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function EEPROM(x, y, scope = globalScope, dir = "RIGHT", bitWidth = 8, addressWidth = 8, data = null) {
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RAM.call(this, x, y, scope, dir, bitWidth, addressWidth);
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this.data = data || this.data;
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}
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EEPROM.prototype = Object.create(RAM.prototype);
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EEPROM.prototype.tooltipText = "Electrically Erasable Programmable Read-Only Memory";
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EEPROM.prototype.constructor = EEPROM;
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EEPROM.prototype.shortName = "EEPROM";
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EEPROM.prototype.maxAddressWidth = 10;
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EEPROM.prototype.helplink = "https://docs.circuitverse.org/#/memoryElements?id=eeprom";
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EEPROM.prototype.mutableProperties = {
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"addressWidth": {
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name: "Address Width",
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type: "number",
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max: "10",
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min: "1",
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func: "changeAddressWidth",
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},
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"dump": RAM.prototype.mutableProperties.dump,
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"reset": RAM.prototype.mutableProperties.reset,
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}
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EEPROM.prototype.customSave = function () {
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var saveInfo = RAM.prototype.customSave.call(this);
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// Normalize this.data to use zeroes instead of null when serialized.
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var data = this.data;
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for (var i = 0; i < data.length; i++) {
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data[i] = data[i] || 0;
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}
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saveInfo.constructorParamaters.push(data);
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return saveInfo;
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}
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//This is a EERAM without a clock - not normal
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//reset is supported
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EEPROM.moduleVerilog = function () {
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return `
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module EEPROM(dout, addr, din, we, dmp, rst);
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parameter WIDTH = 8;
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parameter ADDR = 10;
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output [WIDTH-1:0] dout;
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input [ADDR-1:0] addr;
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input [WIDTH-1:0] din;
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input we;
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input dmp;
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input rst;
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reg [WIDTH-1:0] mem[2**ADDR-1:0];
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integer j;
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assign dout = mem[addr];
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always @ (*) begin
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if (!rst)
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for (j=0; j < 2**ADDR-1; j=j+1) begin
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mem[j] = 0;
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end
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if (!we)
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mem[addr] = din;
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dout = mem[addr];
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end
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endmodule
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`;
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}
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