82540EP Datasheet, PDF (25/46 Pages) Intel Corporation – 82540EP Gigabit Ethernet Controller

Networking Silicon — 82540EP
4.4
AC Characteristics
Table 9. AC Characteristics: 3.3 V Interfacing
Symbol
Parameter
CLK
Clock frequency in PCI mode
Min
Typ
Max
Unit
66
MHz
Table 10. 25 MHz Clock Input Requirements
Symbol
Parameter^a
Min
Typ
Max
Unit
fi_TX_CLK
TX_CLK_IN frequency
25 - 50 ppm
25
25 + 50
ppm
MHz
a. This parameter applies to an oscillator connected to the Crystal One (XTAL1) input. Alternatively, a crystal may be connected
to XTAL1 and XTAL2 as the frequency source for the internal oscillator.
Table 11. Link Interface Clock Requirements
Symbol
fGTX^a
Parameter
GTX_CLK frequency
a. GTX_CLK is used externally for test purposes only.
Min
Typ
Max
Unit
125
MHz
Table 12. EEPROM Interface Clock Requirements
Symbol
fSK
Parameter
Min
Typ
Max
Unit
1
MHz
Table 13. AC Test Loads for General Output Pins
Symbol
CL
CL
CL
CL
Signal Name
TDO
PME#, SDP[7:0]
EEDI, EESK
RX_ACTIVITY, TX_ACTIVITY, LINK_UP
Value
10
16
18
20
Units
pF
pF
pF
pF
19