AM79C971VCW Advanced Micro Devices, AM79C971VCW Datasheet - Page 207

• Manufacturer Part Number: AM79C971VCW
• Description: PCnet-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus
• Manufacturer: Advanced Micro Devices

SWITCHING CHARACTERISTICS: ATTACHMENT UNIT INTERFACE
Notes:
1. DI pulses narrower than tP
2. DI pulses narrower than t
3. CI pulses narrower than t
4. CI pulses narrower than t
Parameter
Symbol
AUI Port
t
t
t
t
t
t
t
t
Internal MENDEC Clock Timing
t
t
t
t
t
DOTR
DOTF
DORM
DOETD
PWODI
PWKDI
PWOCI
PWKCI
X1
X1H
X1L
X1R
X1F
internal DI carrier sense off.
nal CI carrier sense off.
Parameter Name
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 Accept/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
PWKCI
PWKDI
PWOCI
WODI
(min) will maintain internal CI carrier sense on; pulses wider than t
(min) will maintain internal DI carrier sense on; pulses wider than t
(min) will be rejected; pulses wider than t
(min) will be rejected; pulses wider than t
Test Condition
|V
(Note 1)
|V
(Note 2)
|V
(Note 3)
|V
(Note 4)
V
V
V
V
V
IN
IN
IN
IN
IN
IN|
IN|
IN|
IN|
Am79C971
= External Clock
= External Clock
= External Clock
= External Clock
= External Clock
> |V
> |V
> |V
> |V
ASQ
ASQ
ASQ
ASQ
|
|
|
|
PWOCI
PWODI
(max) will turn internal CI carrier sense on.
(max) will turn internal DI carrier sense on.
Min
2.5
2.5
200
15
136
10
90
49.995
20
20
PWKCI
PWKDI
Max
5.0
5.0
1.0
375
45
200
26
160
50.001
5
5
(max) will turn inter-
(max) will turn
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
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