Entity: SynchronizerOneShotCnt

Diagram

time TPD_G sl RST_POLARITY_G boolean RST_ASYNC_G boolean COMMON_CLK_G sl IN_POLARITY_G sl OUT_POLARITY_G string USE_DSP_G sl SYNTH_CNT_G boolean CNT_RST_EDGE_G positive CNT_WIDTH_G sl wrClk sl wrRst sl dataIn sl rdClk sl rdRst sl rollOverEn sl cntRst sl dataOut slv(CNT_WIDTH_G-1 downto 0) cntOut

Description

Company : SLAC National Accelerator Laboratory

Description: Wrapper for SynchronizerOneShot with counter output

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 Simulation FF output delay
RST_POLARITY_G sl '1' '1' for active HIGH reset, '0' for active LOW reset
RST_ASYNC_G boolean false true if reset is asynchronous, false if reset is synchronous
COMMON_CLK_G boolean false True if wrClk and rdClk are the same clock
IN_POLARITY_G sl '1' 0 for active LOW, 1 for active HIGH (dataIn port)
OUT_POLARITY_G sl '1' 0 for active LOW, 1 for active HIGH (dataOut port)
USE_DSP_G string "no" "no" for no DSP implementation, "yes" to use DSP slices
SYNTH_CNT_G sl '1' Set to 1 for synthesising counter RTL, '0' to not synthesis the counter
CNT_RST_EDGE_G boolean true true if counter reset should be edge detected, else level detected
CNT_WIDTH_G positive 16

Ports

Port name Direction Type Description
wrClk in sl Write Ports (wrClk domain)
wrRst in sl
dataIn in sl trigger to be sync'd
rdClk in sl clock to be SYNC'd to
rdRst in sl
rollOverEn in sl '1' allows roll over of the counter
cntRst in sl Optional counter reset
dataOut out sl synced one-shot pulse
cntOut out slv(CNT_WIDTH_G-1 downto 0)

Signals

Name Type Description
r RegType
rin RegType
syncRst sl
cntRstSync sl
rollOverEnSync sl
cntOutSync slv(CNT_WIDTH_G-1 downto 0)

Constants

Name Type Value Description
MAX_CNT_C slv(CNT_WIDTH_G-1 downto 0) (others => '1')
REG_INIT_C RegType ( dataInDly => not(IN_POLARITY_G),
cntOut => (others => '0'))

Types

Name Type Description
RegType

Instantiations