W90221X Winbond Electronics Corp America, W90221X Datasheet - Page 125

• Manufacturer Part Number: W90221X
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

Bits 9-10
Bits 11-15
Bits 16-20
Bit 21
Bit 22
Bits 23-31
W90221X version 0.6
1X
10
11
00
01
0
1
1
32-bit type, length counter counts by word
Undefined
DMA transfer type
Memory-to-memory transfer
Memory-to-I/O transfer
I/O-to-memory transfer
DMA I/O read/write command recovery time
This field defines the recovery cycles between two read/write
commands.
DMA I/O read/write command wait state
This field defines the I/O read/write command wait state.
DMA transfer fix mode
The DMA is set in fix mode. The channel 0 is the most privileged. The
channel 1 will not get the service token unless the channel 0 releases
the request.
The DMA is set in rotate mode. In rotate mode, the DMA controller
acknowledges channel 1 request right after channel 0 being served.
The channel 0 and channel 1 are served by turns.
Reserved
Ready timeout counter
When I/O read/write command is issued, and if the I/O device inserts
wait state by asserting IORDY, the ready timeout counter starts to
count. If the counter reaches the Tout[0:8] before read/write command
is completed, the timeout flags TO0 or TO1 is to be set.
- 125 -