参数资料
型号: SLC88B17QFP
厂商: STANDARD MICROSYSTEMS CORP
元件分类: 总线控制器
英文描述: ISA BUS CONTROLLER, PQFP160
封装: QFP-160
文件页数: 14/54页
文件大小: 333K
代理商: SLC88B17QFP
SMSC DS – SLC88B17
Page 21
Rev. 09/28/99
Table 2 - PCI Data Bus vs DMA I/O Port Size
PCI DMA I/O PORT SIZE
PCI DATA BUS CONNECTION
Byte
AD[7:0]
Word
AD[15:0]
Table 3 - DMA I/O Cycle Width vs nBE[3:0]
nBE[3:0]
DESCRIPTION
1110b
8-bit DMA I/O Cycle
1100b
16-bit DMA I/O Cycle
Note: For verify cycles the value of the byte enables (Bes) is a “don’t care”
The SLC88B17 recognizes a valid signal on its nISAGNT combined with the DMA I/O address as its command
authorization to initiate a DMA access cycle. The south bridge is required to assert the DMA I/O device’s nISAGNT
signal until the data phase of the I/O portion of the DMA transfer.
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