AM79C98 Advanced Micro Devices, AM79C98 Datasheet - Page 17

• Manufacturer Part Number: AM79C98
• Description: Twisted-Pair Ethernet Transceiver (TPEX)
• Manufacturer: Advanced Micro Devices

SWITCHING CHARACTERISTICS (continued)
Notes:
1. Parameter not tested.
2. Uses switching test load.
3. DO pulses narrower than t
4. DO pulses narrower than t
5. RXD pulses narrower than t
Parameter
Receive Timing
Collision Detection and SQE Test
Symbol
t
internal DO carrier sense off.
internal RXD carrier sense off.
t
t
RCVOFF
PWKRD
RCVON
t
t
t
t
t
t
t
t
SQED
t
t
RETD
t
COFF
t
SQEL
CPW
RON
RHD
t
t
CON
RVB
RSD
RLD
t
PER
RM
RR
RF
Parameter Description
RXD Pulse Width
Maintain/Turn-Off Threshold
Receiver Start Up Delay
(RXD to DI+/–)
First Validly Timed Bit
on DI+/– (RXD to DI)
Receiver Static Propagation
Delay (RXD to DI)
DI End of Transmission
RXD L–>H to DI+ L–>H
and DI– H–>L Delay
RXD H–>L to DI+ H–>L
and DI- L->H Delay
DI+, DI–, CI+, CI– Rise
Time (10% to 90%)
DI+, DI–, CI+, CI– Fall
Time (10% to 90%)
DI+/– & CI+/– Rise and Fall
Time Mismatch (|t
RCV Asserted Delay
RCV De-asserted Delay
Collision Turn-On
Delay (CI+/–)
Collision Turn-Off
Delay (CI+/–)
Collision Period (CI+/–)
Collision Output Pulse Width
(CI+/-)
SQE Test Delay Time
SQE Test Length
PWODO
PWKDO
PWKRD
RR
(min) will be rejected; pulses wider than t
(min) will maintain internal DO carrier sense on; pulses wider than t
(min) will maintain internal RXD carrier sense on; pulses wider than t
– t
RF
|)
|V
(Note 5)
5 MHz Sinusoid
(Note 1)
(Note 1)
IN
Am79C98
| >|V
THS
|
PWODO
(max) will turn internal DO carrier sense on.
t
t
t
RSD
RSD
RON
Min
136
200
200
600
500
87
40
– 2.5
– 2.5
– 50
PWKDO
t
t
t
PWKRD
t
t
RON
RSD
RON
RSD
RSD
1600
1500
Max
200
400
500
500
117
5.0
5.0
2.0
70
60
+ 100
+ 100
+ 250
+ 2.5
+ 2.5
(max) will turn
(max) will turn
AMD
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
17