dp83902a National Semiconductor Corporation, dp83902a Datasheet - Page 62

• Manufacturer Part Number: dp83902a
• Description: St-nictm Serial Network Interface Controller For Twisted Pair
• Manufacturer: National Semiconductor Corporation

15 0 Switching Characteristics
Note 1 Start of next transfer is dependent on where RACK is generated relative to BSCK and whether or not 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 BSCK
Note 4 Assumes no local DMA interleave no CS and immediate BACK
Symbol
bpwrl
bpwrh
prqh
prql
rakw
rhpwh
Bus Clock to Port Write Low
Bus Clock to Port Write High
Port Write High to Port Request High (Note 1)
Port Request Low from Read Acknowledge High
Remote Acknowledge Read Strobe Pulse Width
Read Acknowledge High to Next Port Write Cycle
(Notes 2 3 4)
Remote DMA (Read Send Command) Recovery Time
Parameter
AC Specs DP83902A Note All Timing is Preliminary (Continued)
62
Min
20
11
Max
43
40
30
60
BSCK
TL F 11157 – 43
Units
ns
ns
ns
ns
ns