Tnetx4090 thunderswitch ii, Switch – Texas Instruments THUNDERSWITCH II TNETX4090 User Manual
Page 71
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
tsu(EDIO:Start)
Setup time, start condition during ECLK high
383
tc
2
th(EDIO:Start)
Hold time, start condition during ECLK high
383
tc
3
th(EDIO:Data)
Hold time, data after ECLK
↓
0
tc
4
tsu(EDIO:Data)
Setup time, data before ECLK
↑
383
tc
5
tw(ECLK)
Pulse duration, ECLK low during start/stop
766
tc
6
tw(ECLK)
Pulse duration, ECLK high during start/stop
766
tc
7
tw(ECLK:Data)
Pulse duration, ECLK high during data
383
tc
8
tw(ECLK:Data)
Pulse duration, ECLK low during data
766
tc
9
fclock(ECLK)
Clock frequency, ECLK
98
kHz
EDIO (out)
7
8
4
2
1
3
5
6
ECLK
Figure 27. EEPROM Writes
EEPROM reads (see Figure 28)
NO.
MIN
MAX
UNIT
1
tsu(EDIO)
Setup time, EDIO (in) before ECLK
↑
10
ns
2
th(EDIO)
Hold time, EDIO (in) after ECLK
↓
0
ns
ECLK
1
2
EDIO (in)
Figure 28. EEPROM Reads