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TNETX4090
ThunderSWITCH II
9-PORT 100-/1000-MBIT/S ETHERNET
SWITCH
SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999
71
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
EEPROM interface
For further information on EEPROM interface timing, refer to the 24C02 or 24C08 serial EEPROM data sheets.
EEPROM writes (see Figure 27)
NO. MIN MAX UNIT
1 t
su(EDIO:Start)
Setup time, start condition during ECLK high 383 t
c
2 t
h(EDIO:Start)
Hold time, start condition during ECLK high 383 t
c
3 t
h(EDIO:Data)
Hold time, data after ECLK↓ 0 t
c
4 t
su(EDIO:Data)
Setup time, data before ECLK↑ 383 t
c
5 t
w(ECLK)
Pulse duration, ECLK low during start/stop 766 t
c
6 t
w(ECLK)
Pulse duration, ECLK high during start/stop 766 t
c
7 t
w(ECLK:Data)
Pulse duration, ECLK high during data 383 t
c
8 t
w(ECLK:Data)
Pulse duration, ECLK low during data 766 t
c
9 f
clock(ECLK)
Clock frequency, ECLK 98 kHz
EDIO (out)
7 8
421
3
5 6
ECLK
Figure 27. EEPROM Writes
EEPROM reads (see Figure 28)
NO. MIN MAX UNIT
1 t
su(EDIO)
Setup time, EDIO (in) before ECLK↑ 10 ns
2 t
h(EDIO)
Hold time, EDIO (in) after ECLK↓ 0 ns
ECLK
1
2
EDIO (in)
Figure 28. EEPROM Reads