AX88796LF ASIX Electronics, AX88796LF Datasheet - Page 55

• Manufacturer Part Number: AX88796LF
• Description: 3-in-1 Local CPU Bus Fast Rthernet Controller
• Manufacturer: ASIX Electronics

7.4.1 XTAL / CLOCK
7.4.2 Reset Timing
7.4 A.C. Timing Characteristics
LCLK/XTALIN
CLKO
LCLK/XTALIN
RESET
/RESET
Warning: Some chips may needed long power down for successful PHY auto
negotiation
Tcyc
Thigh
Tlow
Tr/Tf
Tod
Symbol
Symbol
Trst
Root of cause:
The PHY inside of AX88796 has a special request due to the semiconductor’s process. Namely,
it needs a very long power down for successful Auto Negotiation for some chips. We made a test
in lab and found it would be no problem if the PHY's initial time kept for 2 sec for all chips. If the
power down is less then this number, some of the PHY's Auto Negotiation will not be complete
and there will be potential to cause the link fail. If the auto negotiation time is not long enough,
uncertain numbers of chip may not work properly.
CYCLE TIME
CLK HIGH TIME
CLK LOW TIME
CLK SLEW RATE
LCLK/XTALIN TO CLKO OUT DELAY
Reset pulse width
AX88796 L
Tr
Tod
Description
Description
Thigh
Tf
Tcyc
3-in-1 Local Bus Fast Ethernet Controller
Tlow
55
Min
Min
100
16
16
1
ASIX ELECTRONICS CORPORATION
Typ.
Typ.
40
20
20
10
-
-
Max
Max
24
24
4
-
Units
Units
LClk
ns
ns
ns
ns