82540EP — Networking Silicon
26 Datasheet
4.5.2 Link Interface Timing
4.5.3 EEPROM Interface
a. The EEPROM clock is derived from a 125 MHz inter nal clock.
Table 17. Rise and Fall Times
Symbol Parame ter C ondition M in Max Unit
TR Clock rise time 0.8 V to 2.0 V 0.7 ns
TF Clock fall time 2.0 V to 0.8 V 0.7 ns
TR Da t a r i se time 0.8 to 2.0 V 0.7 ns
TF Data fall time 2.0 V to 0.8 V 0.7 ns
Figure 9. Link Interface Rise/Fall Timing
Table 18. Link Interface Cl ock Requiremen t s
Symbol Parameter Min Typ Max Unit
TPW EE_SK pulse width TPERIOD*128 ns
2.0 V
0.8 V
T
F
T
R
Table 19. Link Interface Cl ock Requiremen t s
Symbol ParameteraMin Typ Max Unit
TDOS EE _DO setup time TCYC*2 ns
TDOH EE_DO hold time 0 ns
a.