SMSC LAN9500 - Manual (Page 35)

Hi-Speed USB 2.0 to 10/100 Ethernet Controller
Datasheet
SMSC LAN9500/LAN9500i 35 Revision 1.7 (10-02-08)
DATASHEET
4.5.3 Reset and Configuration Strap Timing
Figure 4.3 illustrates the nRESET pin timing requirements and its relation to the configuration strap
pins and output drive. Assertion of nRESET is not a requirement. However, if used, it must be asserted
for the minimum period specified.
Figure 4.3 nRESET Reset Pin Timing
Table 4.10 nRESET Reset Pin Timing Values
SYMBOL DESCRIPTION MIN TYP MAX UNITS
t
rstia
nRESET input assertion time 1 uS
t
css
Configuration strap pins setup to nRESET deassertion 200 nS
t
csh
Configuration strap pins hold after nRESET deassertion 10 nS
t
odad
Output drive after deassertion 30 nS
t
css
nRESET
Configuration
Strap Pins
t
rstia
t
csh
Output Drive
t
odad