參數(shù)資料
型號: AM79C974
廠商: Advanced Micro Devices, Inc.
英文描述: PCnetTM-SCSI Combination Ethernet and SCSI Controller for PCI Systems
中文描述: PCnetTM -的SCSI結(jié)合以太網(wǎng)和SCSI控制器PCI系統(tǒng)
文件頁數(shù): 148/153頁
文件大?。?/td> 838K
代理商: AM79C974
AMD
A M E N D M E N T
14
Am79C974
have yet to be transferred from the SCSI peripheral de-
vice and must start a new transfer operation to get the
rest of the data. (CTCREG consists of three bytes lo-
cated at ((B)+00h, (B)+04h, and (B)+38h.)
Funneling Logic
Figure 26 shows the internal DMA logic interface with
the SCSI block. The DMA FIFO interfaces to the Funnel
Logic block via a 32-bit data bus, and the funnel logic
properly reduces this stream of data to a 16-bit stream to
properly interface with the SCSI FIFO.
18681A/1-30
Figure 26. DMA FIFO to SCSI FIFO Interface
SCSI DMA Programming Sequence
The following section outlines the procedure for execut-
ing SCSI DMA operations:
1. Issue IDLE command to the DMA Engine
2. Configure the SCSI block registers (e.g. synchro-
nous operation, offset values, etc.)
3. Program the DMA registers to set up address and
transfer count
4. Issue a transfer command to the SCSI command
registers
5. Issue the START command to the DMA engine
6. At the end of the DMA transaction, issue the IDLE
command to the DMA engine
MDL Based DMA Programming
The following section outlines the procedure for execut-
ing MDL based DMA operation:
1. Set up the MDL list
2. Use the programming sequence defined earlier for
initiating a SCSI DMA transfer
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相關(guān)代理商/技術(shù)參數(shù)
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