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): 42/56頁
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
Register Write (Non Latched, ADS0
e
1)
TL/F/8582–79
Symbol
Parameter
Min
Max
Units
rsws
Register Select to Write Setup
(Note 1)
15
ns
rswh
Register Select Hold from Write
0
ns
rwds
Register Write Data Setup
20
ns
rwdh
Register Write Data Hold
21
ns
wackl
Write Low to ACK Low
(Note 2)
n
*
bcyc
a
30
ns
wackh
Write High to ACK High
30
ns
ww
Write Width from ACK
50
ns
Note 1:
Assumes ADS0 is high when RA0–3 changing.
Note 2:
ACK is not generated until CS and SWR are low and the NIC has synchronized to the register access. In Dual Bus systems additional cycles will be used for
a local DMA or remote DMA to complete.
42
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