2021-02-08 15:40:43 +00:00
\m4_TLV_version 1d: tl-x.org
\SV
m4_include_lib(['https://raw.githubusercontent.com/stevehoover/warp-v_includes/2d6d36baa4d2bc62321f982f78c8fe1456641a43/risc-v_defs.tlv'])
2021-02-09 23:22:48 +00:00
// v====================== lib/risc-v_shell_lib.tlv =======================v
// Configuration for WARP-V definitions.
2021-02-08 15:40:43 +00:00
m4+definitions(['
m4_define_vector(['M4_WORD'], 32)
m4_define(['M4_EXT_I'], 1)
m4_define(['M4_NUM_INSTRS'], 0)
m4_echo(m4tlv_riscv_gen__body())
2021-02-09 23:22:48 +00:00
// A single-line M4 macro instantiated at the end of the asm code.
// It actually produces a definition of an SV macro that instantiates the IMem conaining the program (that can be parsed without \SV_plus).
m4_define(['m4_asm_end'], ['`define READONLY_MEM(ADDR, DATA) assign DATA \= instrs[ADDR[\$clog2(\$size(instrs)) + 1 : 2]]; logic [31:0] instrs [0:M4_NUM_INSTRS-1]; assign instrs \= '{m4_instr0['']m4_forloop(['m4_instr_ind'], 1, M4_NUM_INSTRS, [', m4_echo(['m4_instr']m4_instr_ind)'])};'])
2021-02-08 15:40:43 +00:00
'])
2021-02-09 23:22:48 +00:00
// Register File
\TLV rf(_entries, _width, $_reset, $_port1_en, $_port1_index, $_port1_data, $_port2_en, $_port2_index, $_port2_data, $_port3_en, $_port3_index, $_port3_data)
$rf_wr_en = m4_argn(4, $@);
$rf_wr_index[\$clog2(_entries)-1:0] = m4_argn(5, $@);
$rf_wr_data[_width-1:0] = m4_argn(6, $@);
2021-02-08 15:40:43 +00:00
2021-02-09 23:22:48 +00:00
$rf_rd_en1 = m4_argn(7, $@);
$rf_rd_index1[\$clog2(_entries)-1:0] = m4_argn(8, $@);
2021-02-08 15:40:43 +00:00
2021-02-09 23:22:48 +00:00
$rf_rd_en2 = m4_argn(10, $@);
$rf_rd_index2[\$clog2(_entries)-1:0] = m4_argn(11, $@);
2021-02-08 15:40:43 +00:00
2021-02-09 23:22:48 +00:00
/xreg[_entries-1:0]
<<1$value[_width-1:0] = /top$_reset ? #xreg :
/top$rf_wr_en && (/top$rf_wr_index == #xreg)
? /top$rf_wr_data :
$RETAIN;
$_port2_data[_width-1:0] = $rf_rd_en1 ? /xreg[$rf_rd_index1]$value : 'X;
$_port3_data[_width-1:0] = $rf_rd_en2 ? /xreg[$rf_rd_index2]$value : 'X;
2021-02-08 15:40:43 +00:00
2021-02-09 23:22:48 +00:00
// Data Memory
\TLV dmem(_entries, _width, $_reset, $_port1_en, $_port1_index, $_port1_data, $_port2_en, $_port2_index, $_port2_data)
// Allow expressions for most inputs, so define input signals.
$dmem_wr_en = m4_argn(4, $@);
$dmem_wr_index[\$clog2(_entries)-1:0] = m4_argn(5, $@);
$dmem_wr_data[_width-1:0] = m4_argn(6, $@);
$dmem_rd_en = m4_argn(7, $@);
$dmem_rd_index[\$clog2(_entries)-1:0] = m4_argn(8, $@);
2021-02-08 15:40:43 +00:00
/dmem[_entries-1:0]
2021-02-09 23:22:48 +00:00
<<1$value[_width-1:0] = /top$_reset ? #dmem :
/top$dmem_wr_en && (/top$dmem_wr_index == #dmem)
? /top$dmem_wr_data :
$RETAIN;
$_port2_data[_width-1:0] = $dmem_rd_en ? /dmem[$dmem_rd_index]$value : 'X;
2021-02-08 15:40:43 +00:00
\TLV cpu_viz()
// String representations of the instructions for debug.
\SV_plus
2021-02-09 23:22:48 +00:00
// A default signal for ones that are not found.
logic sticky_zero;
assign sticky_zero = 0;
// Instruction strings from the assembler.
2021-02-08 15:40:43 +00:00
logic [40*8-1:0] instr_strs [0:M4_NUM_INSTRS];
assign instr_strs = '{m4_asm_mem_expr "END "};
/cpuviz
\viz_alpha
initEach() {
let imem_header = new fabric.Text("📒 Instr. Memory", {
top: -29,
left: -440,
fontSize: 18,
fontWeight: 800,
fontFamily: "monospace"
})
let decode_header = new fabric.Text("⚙️ Instr. Decode", {
top: 0,
left: 40,
fontSize: 18,
fontWeight: 800,
fontFamily: "monospace"
})
let rf_header = new fabric.Text("📂 Reg. File", {
top: -29 - 40,
left: 280,
fontSize: 18,
fontWeight: 800,
fontFamily: "monospace"
})
let dmem_header = new fabric.Text("🗃️ Data Memory", {
top: -29 - 40,
left: 450,
fontSize: 18,
fontWeight: 800,
fontFamily: "monospace"
})
2021-02-09 23:22:48 +00:00
let missing = new fabric.Text("", {
top: 420,
left: -400,
fontSize: 16,
fontWeight: 500,
fontFamily: "monospace",
fill: "purple"
})
let missing_sigs = new fabric.Group(
[new fabric.Text("🚨 Missing Signals", {
2021-02-08 15:40:43 +00:00
top: 350,
left: -400,
fontSize: 18,
fontWeight: 800,
fill: "red",
fontFamily: "monospace"
2021-02-09 23:22:48 +00:00
}),
new fabric.Rect({
2021-02-08 15:40:43 +00:00
top: 400,
left: -500,
fill: "#ffffe0",
width: 400,
height: 300,
stroke: "black"
2021-02-09 23:22:48 +00:00
}),
missing
],
{visible: false}
)
return {missing,
objects: {imem_header, decode_header, rf_header, dmem_header, missing_sigs}};
2021-02-08 15:40:43 +00:00
},
renderEach: function() {
2021-02-09 23:22:48 +00:00
var missing_list = ""; // String of missing signals.
let sticky_zero = this.svSigRef(`sticky_zero`); // A default zero-valued signal.
// Attempt to look up a signal, using sticky_zero as default and updating missing_list if expected.
siggen = (name, full_name, expected = true) => {
var sig = this.svSigRef(full_name ? full_name : `L0_${name}_a0`)
2021-02-08 15:40:43 +00:00
if (sig == null) {
missing_list += `◾ $${name} \n`;
sig = sticky_zero;
}
return sig
}
2021-02-09 23:22:48 +00:00
// Look up signal, and it's ok if it doesn't exist.
2021-02-08 15:40:43 +00:00
siggen_rf_dmem = (name, scope) => {
2021-02-09 23:22:48 +00:00
return siggen(name, scope, false)
2021-02-08 15:40:43 +00:00
}
2021-02-09 23:22:48 +00:00
// Determine which is_xxx signal is asserted.
2021-02-08 15:40:43 +00:00
siggen_mnemonic = () => {
2021-02-09 23:22:48 +00:00
let instrs = ["lui", "auipc", "jal", "jalr", "beq", "bne", "blt", "bge", "bltu", "bgeu", "lb", "lh", "lw", "lbu", "lhu", "sb", "sh", "sw", "addi", "slti", "sltiu", "xori", "ori", "andi", "slli", "srli", "srai", "add", "sub", "sll", "slt", "sltu", "xor", "srl", "sra", "or", "and", "csrrw", "csrrs", "csrrc", "csrrwi", "csrrsi", "csrrci", "load", "store"];
for(i=0;i<instrs.length;i++) {
var sig = this.svSigRef(`L0_is_${instrs[i]}_a0`)
if(sig != null && sig.asBool()) {
return instrs[i].toUpperCase()
2021-02-08 15:40:43 +00:00
}
2021-02-09 23:22:48 +00:00
}
return "ILLEGAL"
2021-02-08 15:40:43 +00:00
}
2021-02-09 23:22:48 +00:00
//let example = siggen("error_eg")
2021-02-08 15:40:43 +00:00
let pc = siggen("pc");
let rd_valid = siggen("rd_valid");
let rd = siggen("rd");
let result = siggen("result");
let src1_value = siggen("src1_value");
let src2_value = siggen("src2_value");
let imm = siggen("imm");
let imm_valid = siggen("imm_valid");
let rs1 = siggen("rs1");
let rs2 = siggen("rs2");
let rs1_valid = siggen("rs1_valid");
let rs2_valid = siggen("rs2_valid");
let mnemonic = siggen_mnemonic();
2021-02-09 23:22:48 +00:00
let rf_rd_en1 = siggen_rf_dmem("rf_rd_en1")
let rf_rd_index1 = siggen_rf_dmem("rf_rd_index1")
let rf_rd_en2 = siggen_rf_dmem("rf_rd_en2")
let rf_rd_index2 = siggen_rf_dmem("rf_rd_index2")
let rf_wr_en = siggen_rf_dmem("rf_wr_en"
let rf_wr_index = siggen_rf_dmem("rf_wr_index")
let rf_wr_data = siggen_rf_dmem("rf_wr_data")
let dmem_rd_en = siggen_rf_dmem("dmem_rd_en")
let dmem_rd_index = siggen_rf_dmem("dmem_rd_index")
let dmem_wr_en = siggen_rf_dmem("dmem_wr_en")
let dmem_wr_index = siggen_rf_dmem("dmem_wr_index")
2021-02-08 15:40:43 +00:00
let pcPointer = new fabric.Text("👉", {
2021-02-09 23:22:48 +00:00
top: 18 * (pc.asInt() / 4),
2021-02-08 15:40:43 +00:00
left: -295,
2021-02-09 23:22:48 +00:00
fill: "blue",
2021-02-08 15:40:43 +00:00
fontSize: 14,
fontFamily: "monospace"
})
2021-02-09 23:22:48 +00:00
let pc_arrow = new fabric.Line([23, 18 * (pc.asInt() / 4) + 6, 46, 35], {
2021-02-08 15:40:43 +00:00
stroke: "#d0e8ff",
strokeWidth: 2
})
let rs1_arrow = new fabric.Line([330, 18 * rf_rd_index1.asInt() + 6 - 40, 190, 75 + 18 * 2], {
stroke: "#d0e8ff",
strokeWidth: 2,
visible: rf_rd_en1.asBool()
})
let rs2_arrow = new fabric.Line([330, 18 * rf_rd_index2.asInt() + 6 - 40, 190, 75 + 18 * 3], {
stroke: "#d0e8ff",
strokeWidth: 2,
visible: rf_rd_en2.asBool()
})
let rd_arrow = new fabric.Line([310, 18 * rf_wr_index.asInt() + 6 - 40, 168, 75 + 18 * 0], {
stroke: "#d0d0ff",
strokeWidth: 3,
visible: rf_wr_en.asBool()
})
let ld_arrow = new fabric.Line([470, 18 * dmem_rd_index.asInt() + 6 - 40, 175, 75 + 18 * 1], {
stroke: "#d0e8ff",
strokeWidth: 2,
visible: dmem_rd_en.asBool()
})
let st_arrow = new fabric.Line([470, 18 * dmem_wr_index.asInt() + 6 - 40, 175, 75 + 18 * 1], {
stroke: "#d0d0ff",
strokeWidth: 3,
visible: dmem_wr_en.asBool()
})
2021-02-09 23:22:48 +00:00
// Instruction with values
2021-02-08 15:40:43 +00:00
let regStr = (valid, regNum, regValue) => {
return valid ? `r${regNum}` : `rX` // valid ? `r${regNum} (${regValue})` : `rX`
};
let immStr = (valid, immValue) => {
immValue = parseInt(immValue,2) + 2*(immValue[0] << 31)
return valid ? `i[${immValue}]` : ``;
};
let srcStr = ($src, $valid, $reg, $value) => {
return $valid.asBool(false)
? `\n ${regStr(true, $reg.asInt(NaN), $value.asInt(NaN))}`
: "";
};
let str = `${regStr(rd_valid.asBool(false), rd.asInt(NaN), result.asInt(NaN))}\n` +
` = ${mnemonic}${srcStr(1, rs1_valid, rs1, src1_value)}${srcStr(2, rs2_valid, rs2, src2_value)}\n` +
` ${immStr(imm_valid.asBool(false), imm.asBinaryStr())}`;
let instrWithValues = new fabric.Text(str, {
top: 70,
left: 65,
fill: color,
fontSize: 14,
fontFamily: "monospace"
});
2021-02-09 23:22:48 +00:00
2021-02-08 15:40:43 +00:00
// Animate fetch (and provide onChange behavior for other animation).
2021-02-09 23:22:48 +00:00
let fetch_instr_str = siggen(`instr_strs(${pc.asInt() >> 2})`, `instr_strs(${pc.asInt() >> 2})`).asString("UNKNOWN fetch instr")
let fetch_instr_viz = new fabric.Text(fetch_instr_str, {
2021-02-08 15:40:43 +00:00
top: 18 * (pc.asInt() >> 2),
left: -272,
fill: "blue",
fontSize: 14,
fontFamily: "monospace"
})
fetch_instr_viz.animate({top: 32, left: 50}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
});
let src1_value_viz = new fabric.Text(src1_value.asInt(0).toString(), {
left: 316 + 8 * 4,
top: 18 * rs1.asInt(0) - 40,
fill: "blue",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 800,
visible: rs1_valid.asBool(false)
})
setTimeout(() => {src1_value_viz.animate({left: 166, top: 70 + 18 * 2}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})}, 500)
let src2_value_viz = new fabric.Text(src2_value.asInt(0).toString(), {
left: 316 + 8 * 4,
top: 18 * rs2.asInt(0) - 40,
fill: "blue",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 800,
visible: rs2_valid.asBool(false)
})
setTimeout(() => {src2_value_viz.animate({left: 166, top: 70 + 18 * 3}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})}, 500)
let load_viz = new fabric.Text(rf_wr_data.asInt(0).toString(), {
left: 470,
top: 18 * dmem_rd_index.asInt() + 6 - 40,
fill: "blue",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 1000,
visible: false
})
if (dmem_rd_en.asBool()) {
setTimeout(() => {
load_viz.setVisible(true)
load_viz.animate({left: 165, top: 75 + 18 * 1 - 5}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})
setTimeout(() => {
load_viz.setVisible(true)
load_viz.animate({left: 350, top: 18 * rf_wr_index.asInt() - 40}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})
}, 1000)
}, 500)
}
let store_viz = new fabric.Text(src2_value.asInt(0).toString(), {
left: 165,
top: 75 + 18 * 1 - 5,
fill: "blue",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 1000,
visible: false
})
if (dmem_wr_en.asBool()) {
setTimeout(() => {
store_viz.setVisible(true)
store_viz.animate({left: 515, top: 18 * dmem_wr_index.asInt() - 40}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})
}, 1000)
}
let result_shadow = new fabric.Text(result.asInt(0).toString(), {
left: 146,
top: 70,
fill: "#d0d0ff",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 800,
visible: false
})
let result_viz = new fabric.Text(result.asInt(0).toString(), {
left: 146,
top: 70,
fill: "blue",
fontSize: 14,
fontFamily: "monospace",
fontWeight: 800,
visible: false
})
if (rd_valid.asBool() && !dmem_rd_en.asBool()) {
setTimeout(() => {
result_viz.setVisible(true)
result_shadow.setVisible(true)
result_viz.animate({left: 317 + 8 * 4, top: 18 * rd.asInt(0) - 40}, {
onChange: this.global.canvas.renderAll.bind(this.global.canvas),
duration: 500
})
}, 1000)
}
2021-02-09 23:22:48 +00:00
// Missing signals
if (missing_list) {
this.getInitObject("missing_sigs").setVisible(true)
this.fromInit().missing.setText(missing_list)
}
2021-02-08 15:40:43 +00:00
2021-02-09 23:22:48 +00:00
return {objects: [pcPointer, pc_arrow, rs1_arrow, rs2_arrow, rd_arrow, instrWithValues, fetch_instr_viz, src1_value_viz, src2_value_viz, result_shadow, result_viz, ld_arrow, st_arrow, load_viz, store_viz]};
2021-02-08 15:40:43 +00:00
}
/imem[m4_eval(M4_NUM_INSTRS-1):0] // TODO: Cleanly report non-integer ranges.
\viz_alpha
initEach() {
let binary = new fabric.Text("", {
top: 18 * this.getIndex(), // TODO: Add support for '#instr_mem'.
left: -600,
fontSize: 14,
fontFamily: "monospace"
})
let disassembled = new fabric.Text("", {
top: 18 * this.getIndex(), // TODO: Add support for '#instr_mem'.
left: -270,
fontSize: 14,
fontFamily: "monospace"
})
return {objects: {binary: binary, disassembled: disassembled}}
},
renderEach: function() {
2021-02-09 23:22:48 +00:00
let siggen = (name) => {return this.svSigRef(`${name}`) == null ? this.svSigRef(`sticky_zero`) : this.svSigRef(`${name}`)}
2021-02-08 15:40:43 +00:00
// Instruction memory is constant, so just create it once.
let reset = this.svSigRef(`L0_reset_a0`);
let pc = this.svSigRef(`L0_pc_a0`) == null ? this.svSigRef(`sticky_zero`) : this.svSigRef(`L0_pc_a0`);
let rd_viz = !reset.asBool() && (pc.asInt() >> 2) == this.getIndex();
if (!global.instr_mem_drawn) {
global.instr_mem_drawn = [];
}
if (!global.instr_mem_drawn[this.getIndex()]) {
global.instr_mem_drawn[this.getIndex()] = true
2021-02-09 23:22:48 +00:00
let binary_str = siggen(`instrs(${this.getIndex()})`).asBinaryStr(NaN)
let disassembled_str = siggen(`instr_strs(${this.getIndex()})`).asString("")
2021-02-08 15:40:43 +00:00
disassembled_str = disassembled_str.slice(0, -5)
//debugger
this.getInitObject("binary").setText(binary_str)
this.getInitObject("disassembled").setText(disassembled_str)
}
this.getInitObject("disassembled").set({textBackgroundColor: rd_viz ? "#b0ffff" : "white"})
}
/xreg[31:0]
\viz_alpha
initEach: function() {
return {} // {objects: {reg: reg}};
},
renderEach: function() {
siggen = (name) => this.svSigRef(`${name}`) == null ? this.svSigRef(`sticky_zero`) : this.svSigRef(`${name}`);
2021-02-09 23:22:48 +00:00
let rf_rd_en1 = siggen(`L0_rf_rd_en1_a0`)
let rf_rd_index1 = siggen(`L0_rf_rd_index1_a0`)
let rf_rd_en2 = siggen(`L0_rf_rd_en1_a0`)
let rf_rd_index2 = siggen(`L0_rf_rd_index2_a0`)
let rf_wr_index = siggen(`rf_wr_index_a0`)
let wr = siggen(`L1_Xreg[${this.getIndex()}].L1_wr_a0`)
let value = siggen(`Xreg_value_a0(${this.getIndex()})`)
2021-02-08 15:40:43 +00:00
let rd = (rf_rd_en1.asBool(false) && rf_rd_index1.asInt() == this.getIndex()) ||
2021-02-09 23:22:48 +00:00
(rf_rd_en2.asBool(false) && rf_rd_index2.asInt() == this.getIndex())
2021-02-08 15:40:43 +00:00
let mod = wr.asBool(false);
2021-02-09 23:22:48 +00:00
let wr_color = mod && rf_wr_index.asInt() == this.getIndex()
let reg = parseInt(this.getIndex())
let regIdent = reg.toString().padEnd(2, " ")
let newValStr = regIdent + ": "
2021-02-08 15:40:43 +00:00
let reg_str = new fabric.Text(regIdent + ": " + value.asInt(NaN).toString(), {
top: 18 * this.getIndex() - 40,
left: 316,
fontSize: 14,
fill: mod ? "blue" : "black",
fontWeight: mod ? 800 : 400,
fontFamily: "monospace",
textBackgroundColor: rd ? "#b0ffff" : wr_color ? "#ffef87" : null
})
if (mod) {
setTimeout(() => {
console.log(`Reg ${this.getIndex()} written with: ${newValStr}.`)
reg_str.set({text: newValStr, dirty: true})
this.global.canvas.renderAll()
}, 1500)
}
return {objects: [reg_str]}
}
/dmem[31:0]
\viz_alpha
initEach: function() {
return {} // {objects: {reg: reg}};
},
renderEach: function() {
siggen = (name) => this.svSigRef(`${name}`) == null ? this.svSigRef(`sticky_zero`) : this.svSigRef(`${name}`);
2021-02-09 23:22:48 +00:00
let dmem_rd_en = siggen(`L0_dmem_rd_en_a0`);
let dmem_rd_index = siggen(`L0_dmem_rd_index_a0`);
let dmem_wr_index = siggen(`L0_dmem_wr_index_a0`);
2021-02-08 15:40:43 +00:00
let wr = siggen(`L1_Dmem[${this.getIndex()}].L1_wr_a0`);
let value = siggen(`Dmem_value_a0(${this.getIndex()})`);
let rd = dmem_rd_en.asBool() && dmem_rd_index.asInt() == this.getIndex();
let mod = wr.asBool(false);
let wr_color = mod && dmem_wr_index.asInt() == this.getIndex();
let reg = parseInt(this.getIndex());
let regIdent = reg.toString().padEnd(2, " ");
let newValStr = regIdent + ": ";
let dmem_str = new fabric.Text(regIdent + ": " + value.asInt(NaN).toString(), {
top: 18 * this.getIndex() - 40,
left: 480,
fontSize: 14,
fill: mod ? "blue" : "black",
fontWeight: mod ? 800 : 400,
fontFamily: "monospace",
textBackgroundColor: rd ? "#b0ffff" : wr_color ? "#ffef87" : null
})
if (mod) {
setTimeout(() => {
console.log(`Reg ${this.getIndex()} written with: ${newValStr}.`)
dmem_str.set({text: newValStr, dirty: true})
this.global.canvas.renderAll()
}, 1500)
}
return {objects: [dmem_str]}
}
2021-02-09 23:22:48 +00:00
// ^===================================================================^
\SV
m4_makerchip_module // (Expanded in Nav-TLV pane.)
\TLV
// /====================\
// | Sum 1 to 9 Program |
// \====================/
//
// Program for MYTH Workshop to test RV32I
// Add 1,2,3,...,9 (in that order).
//
// Regs:
// r10 (a0): In: 0, Out: final sum
// r12 (a2): 10
// r13 (a3): 1..10
// r14 (a4): Sum
//
// External to function:
m4_asm(ADD, r10, r0, r0) // Initialize r10 (a0) to 0.
// Function:
m4_asm(ADD, r14, r10, r0) // Initialize sum register a4 with 0x0
m4_asm(ADDI, r12, r10, 1010) // Store count of 10 in register a2.
m4_asm(ADD, r13, r10, r0) // Initialize intermediate sum register a3 with 0
// Loop:
m4_asm(ADD, r14, r13, r14) // Incremental addition
m4_asm(ADDI, r13, r13, 1) // Increment intermediate register by 1
m4_asm(BLT, r13, r12, 1111111111000) // If a3 is less than a2, branch to label named <loop>
m4_asm(ADD, r10, r14, r0) // Store final result to register a0 so that it can be read by main program
m4_asm(ADDI, r1, r0, 101)
m4_asm(ORI, r6, r0, 0)
m4_asm(SW, r6, r1, 0)
m4_asm(LW, r4, r6, 0)
// Optional:
m4_asm(JAL, r7, 11111111111111101000) // Done. Jump to itself (infinite loop). (Up to 20-bit signed immediate plus implicit 0 bit (unlike JALR) provides byte address; last immediate bit should also be 0)
m4_asm_end()
//1 - PC
$reset = *reset;
$next_pc[31:0] = $reset ? '0 :
$taken_br ? $br_tgt_pc : //9
$is_jal ? $br_tgt_pc : // 13
$is_jalr ? $jalr_tgt_pc : // 13
$pc + 32'd4 ;
$pc[31:0] = >>1$next_pc;
//2 - IMEM - Read
`READONLY_MEM($pc, $$instr[31:0])
//3 - Decode Logic - RISBUJ
$is_i_instr = $instr[6:2] ==? 5'b0000x ||
$instr[6:2] ==? 5'b001x0 ||
$instr[6:2] ==? 5'b11001 ;
$is_r_instr = $instr[6:2] ==? 5'b01011 ||
$instr[6:2] ==? 5'b011x0 ||
$instr[6:2] ==? 5'b10100 ;
$is_s_instr = $instr[6:2] ==? 5'b0100x;
$is_b_instr = $instr[6:2] ==? 5'b11000;
$is_j_instr = $instr[6:2] ==? 5'b11011;
$is_u_instr = $instr[6:2] ==? 5'b0x101;
//4 - Instr Fields
$funct7[6:0] = $instr[31:25];
$funct3[2:0] = $instr[14:12];
$rs1[4:0] = $instr[19:15];
$rs2[4:0] = $instr[24:20];
$rd[4:0] = $instr[11:7];
$opcode[6:0] = $instr[6:0];
`BOGUS_USE($funct7 $funct3 $rs1 $rs2 $rd $opcode)
$funct7_valid = $is_r_instr;
$funct3_valid = $is_r_instr || $is_i_instr || $is_s_instr || $is_b_instr;
$rs1_valid = $is_r_instr || $is_i_instr || $is_s_instr || $is_b_instr;
$rs2_valid = $is_r_instr || $is_s_instr || $is_b_instr ;
$rd_valid = $is_r_instr || $is_i_instr || $is_u_instr || $is_j_instr;
$imm_valid = $is_i_instr || $is_s_instr || $is_b_instr || $is_u_instr || $is_j_instr;
`BOGUS_USE($funct7_valid $funct3_valid $rs1_valid $rs2_valid $rd_valid $imm_valid)
//5 - Imm
$imm[31:0] = $is_i_instr ? {{21{$instr[31]}}, $instr[30:20]} :
$is_s_instr ? {{21{$instr[31]}}, $instr[30:25], $instr[11:7]} :
$is_b_instr ? {{20{$instr[31]}}, $instr[7], $instr[30:25], $instr[11:8], 1'b0} :
$is_u_instr ? {$instr[31:12], 12'b0} :
$is_j_instr ? {{12{$instr[31]}}, $instr[19:12], $instr[20], $instr[30:21], 1'b0} :
32'b0 ;
`BOGUS_USE($imm)
//6 - Decode Instr Name
$dec_bits[10:0] = {$funct7[5], $funct3, $opcode};
$is_beq = $dec_bits ==? 11'bx_000_1100011;
$is_bne = $dec_bits ==? 11'bx_001_1100011;
$is_blt = $dec_bits ==? 11'bx_100_1100011;
$is_bge = $dec_bits ==? 11'bx_101_1100011;
$is_bltu = $dec_bits ==? 11'bx_110_1100011;
$is_bgeu = $dec_bits ==? 11'bx_111_1100011;
$is_addi = $dec_bits ==? 11'bx_000_0010011;
$is_add = $dec_bits ==? 11'b0_000_0110011;
`BOGUS_USE($is_beq $is_bne $is_blt $is_bge $is_bltu $is_bgeu $is_addi $is_add)
//7 - RF Read
//$rf_rd_en1 = $rs1_valid;
//$rf_rd_index1[4:0] = $rs1;
//$src1_value[31:0] = $rf_rd_data1;
//$rf_rd_en2 = $rs2_valid;
//$rf_rd_index2[4:0] = $rs2;
//$src2_value[31:0] = $rf_rd_data2;
//`BOGUS_USE($src1_value $src2_value)
//8 - ALU
//$result[31:0] = $is_addi ? $src1_value + $imm :
// $is_add ? $src1_value + $src2_value :
// 32'bx;
//$rf_wr_en = $rd_valid && ($rd != 5'b0);
//$rf_wr_index[4:0] = $rd;
//$rf_wr_data[31:0] = $is_load ? $ld_data : $result; // 14
//9- Branch
$taken_br = $is_beq ? ($src1_value == $src2_value) :
$is_bne ? ($src1_value != $src2_value) :
$is_blt ? (($src1_value < $src2_value) ^ ($src1_value[31] != $src2_value[31])) :
$is_bge ? (($src1_value >= $src2_value) ^ ($src1_value[31] != $src2_value[31])) :
$is_bltu ? ($src1_value < $src2_value) :
$is_bgeu ? ($src1_value >= $src2_value) :
1'b0;
$br_tgt_pc[31:0] = $pc + $imm;
// 10 - Stop
//*passed = |cpu/xreg[10]>>5$value == (1+2+3+4+5+6+7+8+9);
//11
$is_lui = $dec_bits ==? 11'bx_xxx_0110111 ;
$is_auipc = $dec_bits ==? 11'bx_xxx_0010111 ;
$is_jal = $dec_bits ==? 11'bx_xxx_1101111 ;
$is_jalr = $dec_bits ==? 11'bx_000_1100111 ;
$is_load = $opcode == 7'b0000011 ;
$is_sb = $dec_bits ==? 11'bx_000_0100011 ;
$is_sh = $dec_bits ==? 11'bx_001_0100011 ;
$is_sw = $dec_bits ==? 11'bx_010_0100011 ;
$is_slti = $dec_bits ==? 11'bx_010_0010011 ;
//12
$result[31:0] = $is_addi || $is_load || $is_s_instr ? $src1_value + $imm : // 14
$is_add ? $src1_value + $src2_value :
$is_lui ? {$imm[31:12], 12'b0} :
$is_auipc ? $pc + $imm :
$is_jal ? $pc + 32'd4 :
$is_jalr ? $pc + 32'd4 :
$is_slti ? (($src1_value[31] == $imm[31]) ? $src1_value < $imm : {31'b0, $src1_value[31]}) :
32'bx;
//13
$is_jump = $is_jal || $is_jalr;
$jalr_tgt_pc[31:0] = $src1_value + $imm;
//14
//$dmem_wr_en = $is_s_instr;
//$dmem_rd_en1 = $is_load;
//$dmem_rd_index1[4:0] = $result[6:2];
//$dmem_wr_index[4:0] = $result[6:2];
//$dmem_wr_data[31:0] = $src2_value;
//$ld_data[31:0] = $dmem_rd_data1;
//*passed = |cpu/xreg[4]>>5$value == 0;
// YOUR CODE HERE
// ...
// Note: Because of the magic we are using for visualisation, if visualisation is enabled below,
// be sure to avoid having unassigned signals (which you might be using for random inputs)
// other than those specifically expected in the labs. You'll get strange errors for these.
// Assert these to end simula/toption (before Makerchip cycle limit).
*passed = *cyc_cnt > 50;
*failed = 1'b0;
// Macro instantiations for:
// o instruction memory
// o register file
// o data memory
// o CPU visualization
//|cpu
m4+rf(32, 32, $reset, $rd_valid && ($rd != 5'b0), $rd, $is_load ? $ld_data : $result, $rs1_valid, $rs1, $src1_value[31:0], $rs2_valid, $rs2, $src2_value[31:0])
//m4+rf(32, 32, $reset, $rd_valid && ($rd != 5'b0), $rd, $result, $rs1_valid, $rs1, $src1_value[31:0], $rs2_valid, $rs2, $src2_value[31:0])
m4+dmem(32, 32, $reset, $is_s_instr, $result[6:2], $src2_value, $is_load, $result[6:2], $ld_data[31:0])
m4+cpu_viz()
\SV
endmodule
