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change the way the rom is encoded, makes things easier

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This commit is contained in:
Raphael Jacquot 2019-02-04 11:31:58 +01:00
parent 9f0fadf1b1
commit a44c6f6f36
3 changed files with 32789 additions and 10 deletions
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14
gen_rom_hex.py Executable file
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@ -0,0 +1,14 @@
#!/usr/bin/env python3
f = open("../docs/gxrom-r", "rb")
count=0
filedata = f.read()
f.close()
for b in filedata:
print("%1x %1x "%(int(b&0x0f),int((b&0xf0)>>4)), end="")
count += 1
if count == 8:
print(end=" ")
if count == 16:
print(end="\n")
count = 0

32768
rom-gx-r.hex Normal file
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File diff suppressed because it is too large Load diff

17
saturn_core.v
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@ -8,8 +8,8 @@ module hp_rom (
);
localparam ROM_FILENAME = "rom-gx-r.hex";
reg [7:0] rom [0:524287];
//reg[7:0] rom [0:4096];
//reg [3:0] rom [0:(2**20)-1];
reg[7:0] rom [0:4096];
initial
begin
@ -19,8 +19,7 @@ end
always @(posedge clk)
if (enable)
nibble_out <= address[0] ? rom[address[19:1]][7:4] : rom[address[19:1]][3:0];
nibble_out <= rom[address];
endmodule
@ -695,6 +694,7 @@ task inst_govlng_gosbvl;
4'hF:
begin
decode_state <= DECODE_GOSBVL;
rstk_ptr <= rstk_ptr + 1;
$write("%5h GOSBVL\t", saved_PC);
end
endcase
@ -709,17 +709,14 @@ task inst_govlng_gosbvl;
begin
$display("\t=> %5h", jump_base);
if (decode_state == DECODE_GOSBVL)
begin
rstk_ptr = rstk_ptr + 1;
RSTK[rstk_ptr] = PC;
end
RSTK[rstk_ptr] <= PC;
PC <= jump_base;
end_decode();
end
else
begin
load_ctr = load_ctr + 1;
read_state = READ_START;
load_ctr <= load_ctr + 1;
read_state <= READ_START;
end
end
endcase