jens/vhdl
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

- added pin non-maskable interrupt (NMI).

Browse Source 
Exception vector is reset vector at (X"BFC00000")
-  Interrupt pending flags (IP) are not masked in hardware by IM.

Committed on the Free edition of March Hare Software CVSNT Server.
Upgrade to CVS Suite for more features and support:
http://march-hare.com/cvsnt/


git-svn-id: http://moon:8086/svn/vhdl/trunk@489 cc03376c-175c-47c8-b038-4cd826a8556b
This commit is contained in:
jens
2009-10-03 16:40:29 +00:00
parent 63b60eee52
commit c5027772aa
1 changed files with 18 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/CPUs/MIPS/src/core/mips_cop.vhd
+18 -7
View File
@@ -42,6 +42,7 @@ entity cop is
clk : in STD_LOGIC;
eb : in STD_LOGIC;
int : in unsigned(5 downto 0);
nmi : in STD_LOGIC;
ir_en : in STD_LOGIC;
ir : in word_t;
ctrl_in : in cop0_ctrl_in_t;
@@ -80,6 +81,7 @@ architecture Behavioral of cop is
signal reg_rptr : reg_ptr_t;
signal reg_wptr : reg_ptr_t;
signal inject_exc : STD_LOGIC;
signal latch_vect_en : STD_LOGIC;
type cop_pipe_t is record
opc : opcode_t;
@@ -158,6 +160,7 @@ exception_state:
status_rest <= '0';
inject_exc <= '0';
imem_addr_we <= '0';
latch_vect_en <= '0';
exc_staten <= exc_state;
@@ -181,6 +184,7 @@ exception_state:
end if;
when exc_commit =>
latch_vect_en <= '1';
ctrl_out.exc_pending <= '1';
ctrl_out.exc_commit <= '1';
if ctrl_in.sdu.ID_stall = '0' then
@@ -330,7 +334,8 @@ cop_cache_op:
cop_ip_reg_write:
process(clk)
variable ip_v : unsigned(7 downto 0);
variable ip_v : unsigned(7 downto 0);
variable ipm_v : unsigned(7 downto 0);
begin
if rising_edge(clk) then
if rst = '1' then
@@ -340,9 +345,11 @@ cop_ip_reg_write:
sw_int <= din(9 downto 8);
end if;
end if;
ip_v := (int & sw_int) and im;
ip_v := (int & sw_int);
ipm_v := ip_v and im;
ip <= ip_v;
ctrl_out.int <= eval_int(ip_v) and status(0);
ctrl_out.int <= (eval_int(ipm_v) and status(0));
ctrl_out.NMI <= nmi;
end if;
end process;
@@ -352,10 +359,14 @@ cop_exc_vector:
if rising_edge(clk) then
if rst = '1' then
ctrl_out.exc_vec <= X"BFC00000";
else
ctrl_out.exc_vec <= X"80000080";
if status(22) = '1' then
ctrl_out.exc_vec <= X"BFC00180";
elsif latch_vect_en = '1' then
if ctrl_in.events.nmi = '1' then
ctrl_out.exc_vec <= X"BFC00000";
else
ctrl_out.exc_vec <= X"80000080";
if status(22) = '1' then
ctrl_out.exc_vec <= X"BFC00180";
end if;
end if;
end if;
end if;