URL
https://opencores.org/ocsvn/zipcpu/zipcpu/trunk
Subversion Repositories zipcpu
Compare Revisions
- This comparison shows the changes necessary to convert path
/zipcpu/trunk/rtl/core
- from Rev 174 to Rev 160
- ↔ Reverse comparison
Rev 174 → Rev 160
/div.v
57,11 → 57,6
reg r_sign, pre_sign, r_z, r_c, last_bit; |
reg [(LGBW-1):0] r_bit; |
|
reg zero_divisor; |
initial zero_divisor = 1'b0; |
always @(posedge i_clk) |
zero_divisor <= (r_divisor == 0)&&(r_busy); |
|
initial r_busy = 1'b0; |
always @(posedge i_clk) |
if (i_rst) |
68,7 → 63,7
r_busy <= 1'b0; |
else if (i_wr) |
r_busy <= 1'b1; |
else if ((last_bit)||(zero_divisor)) |
else if ((last_bit)||(o_err)) |
r_busy <= 1'b0; |
|
initial o_busy = 1'b0; |
77,7 → 72,7
o_busy <= 1'b0; |
else if (i_wr) |
o_busy <= 1'b1; |
else if (((last_bit)&&(~r_sign))||(zero_divisor)) |
else if (((last_bit)||(o_err))&&(~r_sign)) |
o_busy <= 1'b0; |
else if (~r_busy) |
o_busy <= 1'b0; |
87,22 → 82,21
o_valid <= 1'b0; |
else if (r_busy) |
begin |
if ((last_bit)||(zero_divisor)) |
o_valid <= (zero_divisor)||(~r_sign); |
if ((last_bit)||(o_err)) |
o_valid <= (o_err)||(~r_sign); |
end else if (r_sign) |
begin |
o_valid <= (~zero_divisor); // 1'b1; |
// if (o_err), o_valid is already one. |
// if not, o_valid has not yet become one. |
o_valid <= (~o_err); // 1'b1; |
end else |
o_valid <= 1'b0; |
|
initial o_err = 1'b0; |
always @(posedge i_clk) |
if((i_rst)||(o_valid)) |
o_err <= 1'b0; |
else if (((r_busy)||(r_sign))&&(zero_divisor)) |
o_err <= 1'b1; |
else |
o_err <= 1'b0; |
else if (o_busy) |
o_err <= (r_divisor == 0); |
|
initial last_bit = 1'b0; |
always @(posedge i_clk) |
178,7 → 172,6
o_quotient[r_bit[(LGBW-1):0]] <= 1'b1; |
r_z <= 1'b0; |
end |
r_sign <= (r_sign)&&(~zero_divisor); |
end else if (r_sign) |
begin |
r_sign <= 1'b0; |