參數(shù)資料
型號(hào): NS32490D
廠商: National Semiconductor Corporation
英文描述: NIC Network Interface Controller(NIC網(wǎng)絡(luò)接口控制器)
中文描述: NIC網(wǎng)絡(luò)接口控制器(NIC網(wǎng)絡(luò)接口控制器)
文件頁數(shù): 50/56頁
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
Remote DMA (Write Cycle)
TL/F/8582–86
Symbol
Parameter
Min
Max
Units
bprqh
Bus Clock to Port Request High
(Note 1)
42
ns
wprql
WACK to Port Request Low
45
ns
wackw
WACK Pulse Width
20
ns
bprdl
Bus Clock to Port Read Low
(Note 2)
40
ns
bprdh
Bus Clock to Port Read High
40
ns
Note 1:
The first port request is issued in response to the remote write command. It is subsequently issued on T1 clock cycles following completion of remote DMA
cycles.
Note 2:
The start of the remote DMA write following WACK is dependent on where WACK is issued relative to BUSCK and whether a local DMA is pending.
50
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