SMSC LAN9514 Manual Do Utilizador
USB Hub with Integrated 10/100 Ethernet Controller
Datasheet
Revision 1.0 (04-20-09)
44
SMSC LAN9514
DATASHEET
4.5.3
EEPROM Timing
The following specifies the EEPROM timing requirements for LAN9514:
Figure 4.1 EEPROM Timing
Table 4.5 EEPROM Timing Values
SYMBOL
DESCRIPTION
MIN
TYP
MAX
UNITS
t
ckcyc
EECLK Cycle time
1110
1130
ns
t
ckh
EECLK High time
550
570
ns
t
ckl
EECLK Low time
550
570
ns
t
cshckh
EECS high before rising edge of EECLK
1070
ns
t
cklcsl
EECLK falling edge to EECS low
30
ns
t
dvckh
EEDO valid before rising edge of EECLK
550
ns
t
ckhdis
EEDO disable after rising edge EECLK
550
ns
t
dsckh
EEDI setup to rising edge of EECLK
90
ns
t
dhckh
EEDI hold after rising edge of EECLK
0
ns
t
ckldis
EECLK low to data disable (OUTPUT)
580
ns
t
cshdv
EEDIO valid after EECS high (VERIFY)
600
ns
t
dhcsl
EEDIO hold after EECS low (VERIFY)
0
ns
t
csl
EECS low
1070
ns
EECLK
EEDO
EEDI
EECS
t
ckldis
t
cshckh
EEDI (VERIFY)
t
ckh
t
ckl
t
ckcyc
t
cklcsl
t
csl
t
dvckh
t
ckhdis
t
dsckh
t
dhckh
t
dhcsl
t
cshdv