REGISTERS
Copyright 2017
6-13
FibreXtreme Hardware Reference
Send Chain Length/Flags (CLENFLGS0) – Offset 0x48
Field
Description
Access
Reset
Value
23 to 0
Length of buffer in 32-bit words.
R/W
0
24
End Chain
– Write ‘1’ to say this is the last chain entry.
Write ‘0’ if it is not.
R/W
0
25
Reserved.
None
0
27 to 26
Data Swapping
– “00” for straight, “01” to swap bytes,
“10” to swap 32-bit words, “11” to swap 32-bit words
and bytes.
R/W
0
28
Reserved.
None
0
29
Interrupt
– Write ‘1’ to interrupt on transfer complete,
Write ‘0’ otherwise.
R/W
0
30
Go
– Set to ‘1’ to start this transaction, ‘0’ to stop it. If it
is a chained transaction, the first action is to fetch the
chain entry.
R/W
0
31
Done
– A ‘1’ indicates this channel is currently idle.
A ‘0’ indicates a DMA is in progress.
R
0
Send Next Chain Entry (CNEXT0) – Offset 0x4C
Field
Description
Access
Reset
Value
3 to 0
Reserved (Lower four bits of PCI address must be
zero).
None
0
31 to 4
PCI address for the next chain entry.
R/W
0
Summary of Contents for FHF5-PC4MWB04-00
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