TNETX4090 datasheet(71/78 Pages) TI1

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TNETX4090

ThunderSWITCH II™ 9-PORT 100-/1000-MBIT/S ETHERNET™ SWITCH

SPWS044E – DECEMBER 1997 – REVISED AUGUST 1999

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

tsu(EDIO:Start)

Setup time, start condition during ECLK high

383

th(EDIO:Start)

Hold time, start condition during ECLK high

383

th(EDIO:Data)

Hold time, data after ECLK

↓

tsu(EDIO:Data)

Setup time, data before ECLK

↑

383

tw(ECLK)

Pulse duration, ECLK low during start/stop

766

tw(ECLK)

Pulse duration, ECLK high during start/stop

766

tw(ECLK:Data)

Pulse duration, ECLK high during data

383

tw(ECLK:Data)

Pulse duration, ECLK low during data

766

fclock(ECLK)

Clock frequency, ECLK

kHz

EDIO (out)

ECLK

Figure 27. EEPROM Writes

EEPROM reads (see Figure 28)

NO.

MIN

MAX

UNIT

tsu(EDIO)

Setup time, EDIO (in) before ECLK

↑

th(EDIO)

Hold time, EDIO (in) after ECLK

↓

ECLK

EDIO (in)

Figure 28. EEPROM Reads

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