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型號(hào)：	IBM3206K0424
廠商：	IBM Microeletronics
英文描述：	IBM Processor for Network Resources(異步轉(zhuǎn)換模式（ATM）32位微處理器（用于網(wǎng)絡(luò)資源管理）)
中文描述：	IBM的處理器（異步轉(zhuǎn)換模式（ATM）的32位微處理器的網(wǎng)絡(luò)資源（用于網(wǎng)絡(luò)資源管理））
文件頁(yè)數(shù)：	171/676頁(yè)
文件大?。?/td>	9810K
代理商：	IBM3206K0424

IBM3206K0424

IBM Processor for Network Resources

pnr25.chapt04.01

August 14, 2000

DMA QUEUES (DMAQS)

Page 171 of 676

3.15: DMAQS System Descriptor Address

The upper 57 bits contain the address of the current descriptor block and the lower seven bits contain the

number of descriptors in the chain that remain to be processed. When doing register-based DMAs, the low

six bits are set to "000001" when the DMAQS Transfer Count and Flag Register is written. If DMA descriptors

are used for DMA transfers, this register will contain the system address of the current descriptor block and

the number of descriptors that remain to be processed. This address may be queued on DMA completion to

correlate DMA transfers with system control blocks. In 32-bit addressing mode, the low-order 32 bits of the

3.16: DMAQS Checksum Register

This register contains the accumulated checksum. This register contains the accumulated checksum value. It

can also be used to initialize the checksum with a seed value. The most significant bit contains the alignment

state (1 = odd, 0 = even alignment). The alignment state is significant between subsequent checksummed

This register can be read at four different addresses. The base address returns the unmodified accumulated

checksum. The base address +4 returns the inverted accumulated checksum. The base address + 8 returns

the byte-swapped accumulated checksum. The base address + 12 returns the inverted byte-swapped accu-

mulated checksum.

Power on Value

0000000000000000

Restrictions

This register should not be written if descriptors are going to be used to set up DMA

transfers. If it is used, it must be written to 0 before descriptors are enqueued.

Q0 Swapped Sum

Q0 Inv Swapped

Q1 Swapped Sum

Q1 Inv Swapped

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