參數(shù)資料
型號: 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): 44/56頁
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
DMA Address Generation
TL/F/8582–81
Symbol
Parameter
Min
Max
Units
bcyc
Bus Clock Cycle Time
(Note 2)
50
1000
ns
bch
Bus Clock High Time
22.5
ns
bcl
Bus Clock Low Time
22.5
ns
bcash
Bus Clock to Address Strobe High
34
ns
bcasl
Bus Clock to Address Strobe Low
44
ns
aswo
Address Strobe Width Out
bch
ns
bcadv
Bus Clock to Address Valid
45
ns
bcadz
Bus Clock to Address TRI-STATE
(Note 3)
15
55
ns
ads
Address Setup to ADS0/1 Low
bch
b
15
ns
adh
Address Hold from ADS0/1 Low
bcl
b
5
ns
Note 1:
Cycles T1’, T2’, T3’, T4’ are only issued for the first transfer in a burst when 32-bit mode has been selected.
Note 2:
The rate of bus clock must be high enough to support transfers to/from the FIFO at a rate greater than the serial network transfers from/to the FIFO.
Note 3:
These limits include the RC delay inherent in our test method. These signals typically turn off within 15 ns, enabling other devices to drive these lines with
no contention.
44
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