Entity: AsyncGearbox

Diagram

time TPD_G positive SLAVE_WIDTH_G boolean SLAVE_BIT_REVERSE_G positive MASTER_WIDTH_G boolean MASTER_BIT_REVERSE_G natural INPUT_PIPE_STAGES_G natural OUTPUT_PIPE_STAGES_G string FIFO_MEMORY_TYPE_G positive FIFO_ADDR_WIDTH_G sl slaveClk sl slaveRst slv(SLAVE_WIDTH_G-1 downto 0) slaveData sl slaveValid sl slaveBitOrder sl slip sl masterClk sl masterRst sl masterReady sl masterBitOrder sl slaveReady slv(MASTER_WIDTH_G-1 downto 0) masterData sl masterValid

Description

Title : Asynchronous Gearbox

Company : SLAC National Accelerator Laboratory

Description: A generic gearbox with asynchronous input and output clocks

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
SLAVE_WIDTH_G positive
SLAVE_BIT_REVERSE_G boolean false
MASTER_WIDTH_G positive
MASTER_BIT_REVERSE_G boolean false
INPUT_PIPE_STAGES_G natural 0 Pipelining generics
OUTPUT_PIPE_STAGES_G natural 0
FIFO_MEMORY_TYPE_G string "distributed" Async FIFO generics
FIFO_ADDR_WIDTH_G positive 4

Ports

Port name Direction Type Description
slaveClk in sl input side data and flow control (slaveClk domain)
slaveRst in sl
slaveData in slv(SLAVE_WIDTH_G-1 downto 0)
slaveValid in sl
slaveReady out sl
slaveBitOrder in sl
slip in sl sequencing and slip (ASYNC input)
masterClk in sl output side data and flow control (masterClk domain)
masterRst in sl
masterData out slv(MASTER_WIDTH_G-1 downto 0)
masterValid out sl
masterReady in sl
masterBitOrder in sl

Signals

Name Type Description
fastClk sl
fastRst sl
gearboxDataIn slv(SLAVE_WIDTH_G-1 downto 0)
gearboxValidIn sl
gearboxReadyIn sl
gearboxDataOut slv(MASTER_WIDTH_G-1 downto 0)
gearboxValidOut sl
gearboxReadyOut sl
gearboxSlip sl
gearboxSlaveBitOrder sl
gearboxMasterBitOrder sl
almostFull sl
writeEnable sl
asyncFifoRst sl

Constants

Name Type Value Description
SLAVE_FASTER_C boolean SLAVE_WIDTH_G <= MASTER_WIDTH_G

Instantiations

Description
[out]