ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 174

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

IBM3206K0424
IBM Processor for Network Resources
3.19: DMAQS DMA Request Size Register
This register specifies the maximum request size for DMA descriptor scheduling.
This is the amount of data that DMAQS will request GPDMA to move in a single request. For example, if a
descriptor wants to move 2K of data and the request size is set to 512 bytes, then DMAQS will request 512
bytes to be moved and then rearbitrate the DMA queues. A value of ‘0’ is the same as 0xffff.
Length
Type
Address
Power on Value
Restrictions
3.20: DMAQS Enq FIFO Register
This register is for diagnostic use only. It holds DMA descriptor waiting to be placed on a DMA queue. Read-
ing this register is destructive. The oldest entry is read on each read. If it is desired to re-dispatch the
dequeued entries, they will have to be re-enqueued.
DMA Descriptors which reside in System Storage are not immediately copied into the queue, but space is
reserved in the queue for the descriptors, and a descriptor is built which will copy the descriptor into the
queue when needed.
Length
Type
Address
Power on Value
Restrictions
DMA QUEUES (DMAQS)
Page 174 of 676
16 bits
Read/Write
XXXX 07C0
X’00000000’
None
64 bits
Read Only
XXXX 07F8
X’0000000000000000’
Can not be written.
pnr25.chapt04.01
August 14, 2000
Preliminary