USB Hub with Integrated 10/100 Ethernet Controller

Datasheet

4.5.3EEPROM Timing

The following specifies the EEPROM timing requirements for LAN9514:

 

 

 

 

tcsl

 

 

EECS

 

 

 

 

 

tckcyc

 

tcklcsl

 

 

 

tcshckh tckh tckl

 

 

 

 

EECLK

 

 

 

 

 

tdvckh

tckhdis

tckldis

 

 

 

 

 

 

 

EEDO

 

 

 

 

 

tdsckh

tdhckh

 

 

 

 

EEDI

 

 

 

 

 

tcshdv

 

tdhcsl

 

 

EEDI (VERIFY)

 

 

 

 

 

Figure 4.1 EEPROM Timing

 

 

 

 

Table 4.5 EEPROM Timing Values

 

 

 

SYMBOL

DESCRIPTION

MIN

TYP

MAX

UNITS

tckcyc

EECLK Cycle time

1110

 

1130

ns

tckh

EECLK High time

550

 

570

ns

tckl

EECLK Low time

550

 

570

ns

tcshckh

EECS high before rising edge of EECLK

1070

 

 

ns

tcklcsl

EECLK falling edge to EECS low

30

 

 

ns

tdvckh

EEDO valid before rising edge of EECLK

550

 

 

ns

tckhdis

EEDO disable after rising edge EECLK

550

 

 

ns

tdsckh

EEDI setup to rising edge of EECLK

90

 

 

ns

tdhckh

EEDI hold after rising edge of EECLK

0

 

 

ns

tckldis

EECLK low to data disable (OUTPUT)

580

 

 

ns

tcshdv

EEDIO valid after EECS high (VERIFY)

 

 

600

ns

tdhcsl

EEDIO hold after EECS low (VERIFY)

0

 

 

ns

tcsl

EECS low

1070

 

 

ns

Revision 1.0 (04-20-09)

44

SMSC LAN9514

 

DATASHEET