am79c970 Advanced Micro Devices, am79c970 Datasheet - Page 139

• Manufacturer Part Number: am79c970
• Description: Pcnettm-pci Single-chip Ethernet Controller For Pci Local Bus
• Manufacturer: Advanced Micro Devices

SWITCHING CHARACTERISTICS: Attachment Unit Interface
Notes:
1. DI pulses narrower than t PWODI (min) will be rejected; pulses wider than t PWODI (max) will turn internal DI carrier sense on.
2. DI pulses narrower than t PWKDI (min) will maintain internal DI carrier sense on; pulses wider than t PWKDI (max) will turn internal
3. CI pulses narrower than t PWOCI (min) will be rejected; pulses wider than t PWOCI (max) will turn internal CI carrier sense on.
4. CI pulses narrower than t PWKCI (min) will maintain internal CI carrier sense on; pulses wider than t PWKCI (max) will turn internal
1-1006
AUI Port
Internal MENDEC Clock Timing
Parameter
Symbol
DI carrier sense off.
CI carrier sense off.
tDOETD
tPWODI
tPWOCI
tPWKDI
tPWKCI
tDORM
tDOTR
tDOTF
tx1H
tx1R
tx1F
tx1L
AMD
tx1
Parameter Description
DO+, DO– Rise Time (10% to 90%)
DO+, DO– Fall Time (10% to 90%)
DO+, DO– Rise and Fall Time Mismatch
DO End of Transmission
DI Pulse Width Accept/Reject Threshold
DI Pulse Width Maintain/Turn-Off
Threshold
CI Pulse Width Accepth/Reject Threshold
CI Pulse Width Maintain/Turn-Off
Threshold
XTAL1 Period
XTAL1 HIGH Pulse Width
XTAL1 LOW Pulse Width
XTAL1 Rise Time
XTAL1 Fall Time
P R E L I M I N A R Y
Am79C970
Test Conditions
|VIN| > |VASQ| (Note 1)
|VIN| > |VASQ| (Note 2)
|VIN| > |VASQ| (Note 3)
|VIN| > |VASQ| (Note 4)
VIN = External Clock
VIN = External Clock
VIN = External Clock
VIN = External Clock
VIN = External Clock
49.995
Min
200
136
2.5
2.5
15
10
90
20
20
50.001
Max
375
200
160
5.0
5.0
1.0
45
26
5
5
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns