Curtiss-Wright FHF5-PC4MWB04-00, Справочник по аппаратуре

Страница: 63 / 101

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