Page History
- https://github.com/slaclab/rogue/tree/master/src/rogue/protocols/batcher
- https://github.com/slaclab/rogue/tree/master/include/rogue/protocols/batcher
Overview
The AxiStreamBatcher firmware module takes incoming AXI stream and combines multiple sub-frames (packets) into a larger super-frame.
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The batching protocol does not support interleaved AXI streams, which means the same continuous TDEST must be asserted partial frame interleaving for the entire sub-frameframes. Different A sub-frames can have different TDEST valuesframe must be an entire AXI stream frame.
Together these features are very useful for sending high rate (>1MHz), small AXI-Stream frame into a CPU.
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| Name | Description |
|---|---|
| MAX_NUMBER_SUB_FRAME_G | Max. number of sub-frames in a super-frame |
| MAX_SUPER_FRAME_THRESHOLD_G | Sets the super-frame threshold (in units of bytes) to terminate the super-frame at the end of the current sub-frame |
| MAX_CLK_GAP_G | Sets the max. number of clocks cycle between sub-frame to terminate the current super-frame |
| AXIAXIS_CONFIG_G | Defines the AXI stream configuration and used to determine the AXI stream width from AXI_CONFIG_G.TDATA_BYTES_C |
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| Bits | Name | Description |
|---|---|---|
| 3:0 | VERSION | Version info. Should always be 0x1 |
| 7:4 | WIDTH | log2( (AXI stream bit width) /16-bits)
|
| 15:8 | SEQ | Packet sequence number of super-frame |
| Other | Reserved | All reserved bits (undefined) bit set to zero |
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If TYPE = 16-bit AXI stream, then appended header is 2 bytes.
If TYPE = 32-bit AXI stream, then appended header is 4 bytes.
If TYPE = 64-bit AXI stream, then appended header is 8 bytes.
If TYPE = 128-bit AXI stream, then appended header is 16 bytes.
If TYPE = 256-bit AXI stream, then appended header is 32 bytes.
If TYPE = 512-bit AXI stream, then appended header is 64 bytes.
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Sub-Frame Tail
Each sub-frame within the super-frame is appended with a tail (no header) as follows:
| Bits | Name | Description | |||
|---|---|---|---|---|---|
| 731:0 | SIZE | Number of valid bytes in the sub-frame | |||
| 39:32 | TDEST | TDEST of AXI-Stream sub-frame | |||
| 1547:840 | TUSER_FIRST | TUSER of the AXI-Stream sub-frame | |||
| 2355:1648 | TUSER_LAST | TUSER of last transaction of the AXI-Stream sub-frame. | |||
| 2859:24 | LAST_BYTE_CNT | Number of valid bytes in last transaction of sub-frame | |||
| 29 | MAX_NUMBER_SUB_FRAME | Indicates super-frame terminated due to MAX_NUMBER_SUB_FRAME_G | |||
| 30 | SUPER_FRAME_THRESHOLD | Indicates super-frame terminated due to SUPER_FRAME_THRESHOLD_G | |||
| 31 | CLK_GAP | Indicates super-frame terminated due to MAX_CLK_GAP_G | |||
| 56 | WIDTH | log2( (AXI stream bit width) /16-bits)
| 63:32 | SIZE | Number of valid bytes in the sub-frame |
| Other | Reserved | All reserved bits (undefined) bit set to zero |
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If TYPE = 16-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 32-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 64-bit AXI stream, then appended tail is 8 bytes.
If TYPE = 128-bit AXI stream, then appended tail is 16 bytes.
If TYPE = 256-bit AXI stream, then appended header is 32 bytes.
If TYPE = 512-bit AXI stream, then appended header is 64 bytes.
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Contact
Larry Ruckman
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Overview
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