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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 1MHz
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