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- STB_O now deasserts only if SRDY active (fixes bus freezes during heavy traffic)

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git-svn-id: http://moon:8086/svn/vhdl/trunk@34 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2008-10-09 11:53:48 +00:00
parent 86866b26a7
commit 7e82a94595
2 changed files with 13 additions and 13 deletions
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lib/CPUs/MIPS/src/core/dcache.vhd
+8 -8
View File
@@ -344,13 +344,13 @@ cache_state:
sn <= mem_access;
end if;
when mem_access =>
data_write <= '1';
CYC_O <= '1';
if SRDY_I = '1' then
mem_index_count_en <= '1';
STB_O <= '1';
if mem_index_count = 2**word_index_width-1 then
sn <= mem_data;
data_write <= '1';
mem_index_count_en <= '1';
CYC_O <= '1';
STB_O <= '1';
if mem_index_count = 2**word_index_width-1 then
if SRDY_I = '1' then
sn <= mem_data;
end if;
end if;
when mem_data =>
@@ -419,7 +419,7 @@ mem_index_counter:
if rising_edge(CLK_I) then
if mem_index_count_rst = '1' then
mem_index_count <= 0;
elsif mem_index_count_en = '1' then
elsif mem_index_count_en = '1' and SRDY_I = '1' then
if mem_index_count /= 2**word_index_width-1 then
mem_index_count <= mem_index_count + 1;
end if;
lib/CPUs/MIPS/src/core/icache.vhd
+5 -5
View File
@@ -278,12 +278,12 @@ cache_state:
sn <= mem_access;
end if;
when mem_access =>
mem_index_count_en <= '1';
data_write <= '1';
CYC_O <= '1';
if SRDY_I = '1' then
mem_index_count_en <= '1';
STB_O <= '1';
if mem_index_count = 2**word_index_width-1 then
STB_O <= '1';
if mem_index_count = 2**word_index_width-1 then
if SRDY_I = '1' then
sn <= mem_data;
end if;
end if;
@@ -345,7 +345,7 @@ mem_index_counter:
if rising_edge(CLK_I) then
if mem_index_count_rst = '1' then
mem_index_count <= 0;
elsif mem_index_count_en = '1' then
elsif mem_index_count_en = '1' and SRDY_I = '1' then
if mem_index_count /= 2**word_index_width-1 then
mem_index_count <= mem_index_count + 1;
end if;