AM79C985KCW AMD [Advanced Micro Devices], AM79C985KCW Datasheet - Page 38

• Manufacturer Part Number: AM79C985KCW
• Manufacturer: AMD [Advanced Micro Devices]

SWITCHING CHARACTERISTICS (continued)
Notes:
1. Parameter not tested.
2. DI pulses narrower than t
3. DI pulses narrower than t
4. CI pulses narrower than t
5. CI pulses narrower than t
6. RXD pulses narrower than t
38
Twisted Pair Port Timing
Management Port Timing
Parameter
t
Symbol
CLKHCRS
t
t
t
t
t
t
t
t
t
STRSET
STRHLD
carrier sense off.
carrier sense off.
turn RXD carrier sense off.
PWKRD
t
t
t
SCLKH
SCLKR
t
t
PERLP
t
SCLKL
SCLKF
SODLY
PWLP
SISET
SIHLD
TXTD
TETD
SCLK
CLK Rising Edge to TXD Transition Delay
Transmit End of Transmission
RXD Pulse Width Maintain/Turn-off
Threshold
Idle Signal Period
Idle Link Test Pulse Width
SCLK Clock Period
SCLK Clock HIGH
SCLK Clock LOW
SCLK Clock Rise Time
SCLK Clock Fall Time
SI Input Setup Time to SCLK Rising Edge
SI Input Hold Time from SCLK Rising Edge
SO Output Delay from SCLK Rising Edge
CLK Rising Edge to CRS valid
STR Setup Time
STR Hold Time
Parameter Description
PWODI
PWKDI
PWOCI
PWKCI
PWKRD
(min) will maintain internal DI carrier on; pulses wider than t
(min) will maintain internal CI carrier on; pulses wider than t
(min) will be rejected; pulses wider than t
(min) will be rejected; pulses wider than t
(min) will maintain internal RXD carrier sense on; a pulse wider than t
P R E L I M I N A R Y
Am79C985
|V
Test Conditions
IN
|>|V
C
C
L
L
= 100 pF
= 100 pF
THS
| (Note 6)
PWODI
PWOCI
(max) will turn internal DI carrier sense on.
(max) will turn internal CI carrier sense on.
Min
250
136
100
75
30
30
10
10
–
8
–
–
–
5
5
9
PWKDI
PWKCI
(max) will turn internal CI
(max) will turn internal DI
Max
375
200
120
50
24
10
10
40
40
–
–
–
–
–
–
–
PWKRD
(max) will
Unit
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns