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interconnect/axi/axi_common: Document constants.

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Florent Kermarrec 2023-07-28 09:26:53 +02:00
parent ff18374c52
commit ff67781f11
1 changed files with 16 additions and 15 deletions
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litex/soc/interconnect/axi/axi_common.py
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@ -19,24 +19,25 @@ from litex.soc.interconnect import stream
# AXI Constants ------------------------------------------------------------------------------------ # AXI Constants ------------------------------------------------------------------------------------
BURST_FIXED = 0b00 BURST_FIXED = 0b00 # FIXED : No address increment in burst.
BURST_INCR = 0b01 BURST_INCR = 0b01 # INCR : Increment address per transfer in burst.
BURST_WRAP = 0b10 BURST_WRAP = 0b10 # WRAP : Wrap address back to boundary after set transfers.
BURST_RESERVED = 0b11 BURST_RESERVED = 0b11 # RESERVED : Future use.
RESP_OKAY = 0b00 RESP_OKAY = 0b00 # OKAY : Operation completed successfully.
RESP_EXOKAY = 0b01 RESP_EXOKAY = 0b01 # EXOKAY : Operation success, exclusive access granted.
RESP_SLVERR = 0b10 RESP_SLVERR = 0b10 # SLVERR : Slave not responding/cannot complete request.
RESP_DECERR = 0b11 RESP_DECERR = 0b11 # DECERR : Decoding error occurred, operation not routed to a slave.
# AXI transaction size (AXSIZE) constants (left: bytes, right: AXI representation).
AXSIZE = { AXSIZE = {
1 : 0b000, 1 : 0b000, # 1-byte transaction.
2 : 0b001, 2 : 0b001, # 2-byte transaction.
4 : 0b010, 4 : 0b010, # 4-byte transaction.
8 : 0b011, 8 : 0b011, # 8-byte transaction.
16 : 0b100, 16 : 0b100, # 16-byte transaction.
32 : 0b110, 32 : 0b110, # 32-byte transaction.
64 : 0b111, 64 : 0b111, # 64-byte transaction.
} }
# AXI Connection Helpers --------------------------------------------------------------------------- # AXI Connection Helpers ---------------------------------------------------------------------------