Intel 82540EP - Manual (Page 27)

Networking Silicon — 82540EP
Datasheet 21
4.4 AC Characteristics
Table 9. AC Characteristics: 3.3 V Interfacing
Symbol Parameter Min Typ Max Unit
PCICLK Clock frequency in PCI mode 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 Parameter Min Typ Max Unit
fGTX a GTX_CLK frequency 125 MHz
a. GTX_CLK is used externally for test purposes only.
Table 12. EEPROM Interface Clock Requirements
Symbol Parameter Min Typ Max Unit
fSK 1 MHz
Table 13. AC Test Loads for General Output Pins
Symbol Signal Name Value Units
CL TDO 10 pF
CL PME#, SDP[7:0] 16 pF
CL EE_DI, EE_SK 18 pF
CL RX_ACTIVITY, TX_ACTIVITY, LINK_UP 20 pF