Entity: FifoXpm

Diagram

time TPD_G sl RST_POLARITY_G boolean FWFT_EN_G boolean GEN_SYNC_FIFO_G string ECC_MODE_G string MEMORY_TYPE_G natural range 0 to 1 RELATED_CLOCKS_G positive SYNC_STAGES_G natural PIPE_STAGES_G positive DATA_WIDTH_G positive ADDR_WIDTH_G positive FULL_THRES_G positive EMPTY_THRES_G sl rst sl wr_clk sl wr_en slv(DATA_WIDTH_G-1 downto 0) din sl rd_clk sl rd_en slv(ADDR_WIDTH_G-1 downto 0) wr_data_count sl wr_ack sl overflow sl prog_full sl almost_full sl full sl not_full slv(DATA_WIDTH_G-1 downto 0) dout slv(ADDR_WIDTH_G-1 downto 0) rd_data_count sl valid sl underflow sl prog_empty sl almost_empty sl empty

Description

Company : SLAC National Accelerator Laboratory

Description: Wrapper for Xilinx XPM FIFO module

This file is part of 'SLAC Firmware Standard Library'. It is subject to the license terms in the LICENSE.txt file found in the top-level directory of this distribution and at: https://confluence.slac.stanford.edu/display/ppareg/LICENSE.html. No part of 'SLAC Firmware Standard Library', including this file, may be copied, modified, propagated, or distributed except according to

the terms contained in the LICENSE.txt file.

Generics

Generic name Type Value Description
TPD_G time 1 ns
RST_POLARITY_G sl '1' '1' for active high rst, '0' for active low
FWFT_EN_G boolean false
GEN_SYNC_FIFO_G boolean false
ECC_MODE_G string "no_ecc" Allowed values: no_ecc, en_ecc
MEMORY_TYPE_G string "block"
RELATED_CLOCKS_G natural range 0 to 1 0
SYNC_STAGES_G positive 3
PIPE_STAGES_G natural 0
DATA_WIDTH_G positive 18
ADDR_WIDTH_G positive 10
FULL_THRES_G positive 16
EMPTY_THRES_G positive 16

Ports

Port name Direction Type Description
rst in sl Asynchronous Reset
wr_clk in sl Write Ports (wr_clk domain)
wr_en in sl
din in slv(DATA_WIDTH_G-1 downto 0)
wr_data_count out slv(ADDR_WIDTH_G-1 downto 0)
wr_ack out sl
overflow out sl
prog_full out sl
almost_full out sl
full out sl
not_full out sl
rd_clk in sl Read Ports (rd_clk domain)
rd_en in sl
dout out slv(DATA_WIDTH_G-1 downto 0)
rd_data_count out slv(ADDR_WIDTH_G-1 downto 0)
valid out sl
underflow out sl
prog_empty out sl
almost_empty out sl
empty out sl

Signals

Name Type Description
reset sl
sRdEn sl
sValid sl
dout_xpm slv(DATA_WIDTH_G-1 downto 0)
wr_data_count_xpm slv(COUNT_WIDTH_C-1 downto 0)
wr_ack_xpm sl
overflow_xpm sl
prog_full_xpm sl
almost_full_xpm sl
full_xpm sl
rd_data_count_xpm slv(COUNT_WIDTH_C-1 downto 0)
underflow_xpm sl
prog_empty_xpm sl
almost_empty_xpm sl
empty_xpm sl

Constants

Name Type Value Description
READ_MODE_C string ite(FWFT_EN_G,
"fwft",
"std")
DOUT_INIT_C string "0"
MIN_THRES_C positive 8
MAX_THRES_C positive 2**ADDR_WIDTH_G - 8
WAKEUP_TIME_C integer 0 0: Disable sleep, 2: Use Sleep Pin
FIFO_WRITE_DEPTH_C positive 2**ADDR_WIDTH_G Defines the FIFO Write Depth, must be power of two
FIFO_READ_LATENCY_C natural ite(FWFT_EN_G,
0,
1)		 If READ_MODE = "fwft", then the only applicable value is 0
FULL_RESET_VALUE_C natural 1 Assert back pressure during reset
COUNT_WIDTH_C positive ite(FWFT_EN_G,
ADDR_WIDTH_G+1,
ADDR_WIDTH_G)		 In standard READ_MODE, the effective depth = FIFO_WRITE_DEPTH In First-Word-Fall-Through READ_MODE, the effective depth = FIFO_WRITE_DEPTH+2 COUNT_WIDTH_C = ADDR_WIDTH_G+1 to report the correct fill count (units of words)
FULL_THRES_C positive ite((FULL_THRES_G < MIN_THRES_C),
MIN_THRES_C,
ite((FULL_THRES_G > MAX_THRES_C),
MAX_THRES_C,
FULL_THRES_G))		 Force Full threshold to be within allowed XPM range
EMPTY_THRES_C positive ite((EMPTY_THRES_G < MIN_THRES_C),
MIN_THRES_C,
ite((EMPTY_THRES_G > MAX_THRES_C),
MAX_THRES_C,
EMPTY_THRES_G))		 Force Empty threshold to be within allowed XPM range
USE_ADV_FEATURES_C string "1F1F" ----------------------- USE_ADV_FEATURES_C ----------------------- BIT0: Enable overflow BIT1: Enable prog_full BIT2: Enable wr_data_count BIT3: Enable almost_full BIT4: Enable wr_ack BIT5: Undefined BIT6: Undefined BIT7: Undefined BIT8: Enable underflow BIT9: Enable prog_empty BIT10: Enable rd_data_count BIT11: Enable almost_empty BIT12: Enable data_valid

Processes