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- Registered CYC_O

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git-svn-id: http://moon:8086/svn/vhdl/trunk@63 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2008-10-17 13:39:07 +00:00
parent 1c499c6b34
commit f8962066f0
1 changed files with 25 additions and 3 deletions
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lib/CPUs/MIPS/src/core/mips_bui.vhd
+25 -3
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@@ -186,7 +186,29 @@ begin
MRDY_O <= '1';
CYC_O <= not bout_fifo_empty or dmem_mem_rd_gnt or dcache_mem_gnt or icache_mem_gnt;
cyc_registered_out:
process(CLK_I)
variable cyc : std_logic;
begin
if rising_edge(CLK_I) then
if RST_I = '1' then
cyc := '0';
CYC_O <= '0';
else
CYC_O <= cyc or not bout_fifo_empty;
if cyc = '0' then
if (bout_fifo_we and bout_rdy) = '1' then
cyc := '1';
end if;
elsif SRDY_I = '1' then
cyc := dmem_mem_rd_gnt or dcache_mem_gnt or icache_mem_gnt;
end if;
end if;
end if;
end process;
-- CYC_O <= not bout_fifo_empty or dmem_mem_rd_gnt or dcache_mem_gnt or icache_mem_gnt;
STB_O <= not bout_fifo_empty;
ADDR_O <= bout_fifo_addr_out;
DAT_O <= bout_fifo_data_out;
@@ -255,7 +277,7 @@ inst_dcache : dcache
dcache_en <= cpu_dmem_en and not busy;
-- Instantiate synchronous FIFO
inst_bout_fifo: entity work.fifo_sync
inst_bout_fifo: entity work.fifo_sync_dist
GENERIC MAP
(
addr_width => 4,
@@ -294,7 +316,7 @@ inst_bout_fifo: entity work.fifo_sync
bout_fifo_we_in <= '1' when dmem_mem_wr_gnt = '1' else '0';
-- Instantiate synchronous FIFO
inst_write_fifo: entity work.fifo_sync
inst_write_fifo: entity work.fifo_sync_dist
GENERIC MAP
(
addr_width => 4,