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picorv32
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Be more explicit about single register file write port

This commit is contained in:
Clifford Wolf 2016-08-31 00:08:33 +02:00
parent 12c218c1b3
commit 82d837bf96
1 changed files with 16 additions and 4 deletions
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20
picorv32.v
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@ -1063,6 +1063,9 @@ module picorv32 #(
if (cpu_state == cpu_state_ldmem) dbg_ascii_state = "ldmem";
end
reg cpuregs_write;
reg [31:0] cpuregs_wrdata;
reg set_mem_do_rinst;
reg set_mem_do_rdata;
reg set_mem_do_wdata;
@ -1169,6 +1172,8 @@ module picorv32 #(
trap <= 0;
reg_sh <= 'bx;
reg_out <= 'bx;
cpuregs_write = 0;
cpuregs_wrdata = 'bx;
set_mem_do_rinst = 0;
set_mem_do_rdata = 0;
set_mem_do_wdata = 0;
@ -1264,25 +1269,32 @@ module picorv32 #(
latched_branch: begin
current_pc = latched_store ? (latched_stalu ? alu_out_q : reg_out) : reg_next_pc;
`debug($display("ST_RD: %2d 0x%08x, BRANCH 0x%08x", latched_rd, reg_pc + (latched_compr ? 2 : 4), current_pc);)
cpuregs[latched_rd] <= reg_pc + (latched_compr ? 2 : 4);
cpuregs_wrdata = reg_pc + (latched_compr ? 2 : 4);
cpuregs_write = 1;
end
latched_store && !latched_branch: begin
`debug($display("ST_RD: %2d 0x%08x", latched_rd, latched_stalu ? alu_out_q : reg_out);)
cpuregs[latched_rd] <= latched_stalu ? alu_out_q : reg_out;
cpuregs_wrdata = latched_stalu ? alu_out_q : reg_out;
cpuregs_write = 1;
end
ENABLE_IRQ && irq_state[0]: begin
cpuregs[latched_rd] <= current_pc | latched_compr;
cpuregs_wrdata = current_pc | latched_compr;
cpuregs_write = 1;
current_pc = PROGADDR_IRQ;
irq_active <= 1;
mem_do_rinst <= 1;
end
ENABLE_IRQ && irq_state[1]: begin
eoi <= irq_pending & ~irq_mask;
cpuregs[latched_rd] <= irq_pending & ~irq_mask;
cpuregs_wrdata = irq_pending & ~irq_mask;
cpuregs_write = 1;
next_irq_pending = next_irq_pending & irq_mask;
end
endcase
if (cpuregs_write)
cpuregs[latched_rd] <= cpuregs_wrdata;
if (ENABLE_TRACE && latched_trace) begin
latched_trace <= 0;
trace_valid <= 1;