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White Rabbit Switch - Gateware
Commit 2e6a0ce0 authored by Maciej Lipinski's avatar Maciej Lipinski
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swcore:input_block, added dropping of input packets when transfer (output queue full) impossible

parent 680beefd
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Showing with 30 additions and 10 deletions
modules/wrsw_swcore/xswc_input_block.vhd
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......@@ -247,7 +247,8 @@ architecture syn of xswc_input_block is
type t_write_state is (S_IDLE,
S_DROP_PCK,
S_LAST_DROP,
S_LAST_DROP,
S_STUCK_WITH_DATA,
S_START_FIFO_RD, -- start requesting data from FIFO, but still
-- not outputing to write_pump (initial cycle)
-- trick: drdy restricted only to S_WRITE_MPM
......@@ -693,7 +694,10 @@ begin --arch
when S_LAST_DROP =>
--===========================================================================================
if(write_ctrl_out = b"01") then
if(transfering_pck = '1') then -- this means that we are fucked, the SWCORE is stuck with too
-- much data
write_state <= S_STUCK_WITH_DATA;
elsif(write_ctrl_out = b"01") then
write_state <= S_NEW_PCK_IN_FIFO;
else
write_state <= S_IDLE;
......@@ -725,6 +729,13 @@ begin --arch
mpm_pagereq <= '1';
mpm_pageaddr <= pckstart_pageaddr;
--========================================================================================
when S_STUCK_WITH_DATA =>
--========================================================================================
write_state <= S_DROP_PCK;
rtu_data_read_by_write_process <= '1';
--========================================================================================
when S_WRITE_MPM =>
--========================================================================================
......@@ -797,6 +808,11 @@ begin --arch
if(mpm_pageend_i = '1') then -- new page needed to write last chucnk of data
write_state <= S_WAIT_WITH_TRANSFER;
elsif(transfering_pck = '1') then -- this means that we are fucked, the SWCORE is stuck with too
-- much data
write_state <= S_STUCK_WITH_DATA;
else
start_transfer <= '1';
......@@ -817,19 +833,23 @@ begin --arch
-- Of course, this is the case only if the pck finished while pgend request HIGH
if(interpck_page_in_advance = '1') then
if(transfering_pck = '1') then
write_state <= S_STUCK_WITH_DATA;
else
start_transfer <= '1';
mpm_pageaddr <= interpck_pageaddr;
mpm_pagereq <= '1';
start_transfer <= '1';
mpm_pageaddr <= interpck_pageaddr;
mpm_pagereq <= '1';
if(write_ctrl_out = b"01") then
write_state <= S_NEW_PCK_IN_FIFO;
else
write_state <= S_IDLE;
if(write_ctrl_out = b"01") then
write_state <= S_NEW_PCK_IN_FIFO;
else
write_state <= S_IDLE;
end if;
end if;
end if;
--===========================================================================================
when S_NEW_PCK_IN_FIFO =>
--===========================================================================================
......
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