DP8390 NSC [National Semiconductor], DP8390 Datasheet - Page 51

• Manufacturer Part Number: DP8390
• Description: NIC Network Interface Controller
• Manufacturer: NSC [National Semiconductor]

15 0 Switching Characteristics
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
Note 3 Assuming wackw
Note 4 WACK must be high for a minimum of 7 BUSCK
Note 5 This is not a measured value but guaranteed by design
Symbol
bprqh
wprql
wackw
bprdl
bprdh
wprq
k
1 BUSCK and no local DMA interleave no CS immediate BACK and WACK goes high before T4
Bus Clock to Port Request High
(Note 1)
WACK to Port Request Low
WACK Pulse Width
Bus Clock to Port Read Low
(Note 2)
Bus Clock to Port Read High
Remote Write Port Request
to Port Request Time
(Notes 3 4 5)
Parameter
Remote DMA (Write Cycle) Recovery Time
(Continued)
51
Min
20
12
Max
40
45
40
40
BUSCK
Units
TL F 8582 – 87
ns
ns
ns
ns
ns