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(yè)數(shù): 49/56頁(yè)
文件大?。?/td> 689K
代理商: NS32490D
15.0 Switching Characteristics
(Continued)
Remote DMA (Read, Send Command) Recovery Time
TL/F/8582–85
Symbol
Parameter
Min
Max
Units
bpwrl
Bus Clock to Port Write Low
43
ns
bpwrh
Bus Clock to Port Write High
40
ns
prqh
Port Write High to Port
Request High (Note 1)
30
ns
prql
Port Request Low from
Read Acknowledge High
45
ns
rakw
Remote Acknowledge
Read Strobe Pulse Width
20
ns
rhpwh
Read Acknowledge High to
Next Port Write Cycle
(Notes 2,3,4)
11
BUSCK
Note 1:
Start of next transfer is dependent on where RACK is generated relative to BSCK and whether a local DMA is pending.
Note 2:
This is not a measured value but guaranteed by design.
Note 3:
RACK must be high for a minimum of 7 BUSCK.
Note 4:
Assumes no local DMA interleave, no CS, and immediate BACK.
49
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