Entity: AxiStreamShift
- File: AxiStreamShift.vhd
Diagram
Description
Company : SLAC National Accelerator Laboratory
Description: Block to shift data bytes within an AXI stream. Both left and right shifting are allowed. This block will move a packet at a time. Transfer of a new packet
will pause until a new shift command is provided.
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 | |
| AXIS_CONFIG_G | AxiStreamConfigType | ||
| PIPE_STAGES_G | integer range 0 to 16 | 0 | |
| ADD_VALID_EN_G | boolean | false | |
| BYP_SHIFT_G | boolean | false |
Ports
| Port name | Direction | Type | Description |
|---|---|---|---|
| axisClk | in | sl | Clock and reset |
| axisRst | in | sl | |
| axiStart | in | sl | Start control |
| axiShiftDir | in | sl | 0 = left (lsb to msb) |
| axiShiftCnt | in | slv(3 downto 0) | |
| sAxisMaster | in | AxiStreamMasterType | Slave |
| sAxisSlave | out | AxiStreamSlaveType | |
| mAxisMaster | out | AxiStreamMasterType | Master |
| mAxisSlave | in | AxiStreamSlaveType |
Signals
| Name | Type | Description |
|---|---|---|
| r | RegType | |
| rin | RegType | |
| pipeAxisMaster | AxiStreamMasterType | |
| pipeAxisSlave | AxiStreamSlaveType |
Constants
| Name | Type | Value | Description |
|---|---|---|---|
| REG_INIT_C | RegType | ( state => S_IDLE_C, shiftDir => '0', shiftBytes => (others => '0'), slave => AXI_STREAM_SLAVE_INIT_C, master => AXI_STREAM_MASTER_INIT_C, delay => AXI_STREAM_MASTER_INIT_C ) |
Types
| Name | Type | Description |
|---|---|---|
| StateType | (S_IDLE_C, S_FIRST_C, S_SHIFT_C, S_LAST_C) |
|
| RegType |
Functions
- shiftData (shiftBytes : in slv(3 downto 0);
shiftDir : in sl;
shiftFirst : in boolean;
mInput : in AxiStreamMasterType;
mDelay : in AxiStreamMasterType;
mOut : inout AxiStreamMasterType) return ()
Description
Set shift ranges