LAN9303 Datasheet, PDF (351/366 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Single MII/RMII/Turbo MII
Datasheet
14.5.2 Reset and Configuration Strap Timing
This diagram illustrates the nRST pin timing requirements and its relation to the configuration strap
pins and output drive. Assertion of nRST is not a requirement. However, if used, it must be asserted
for the minimum period specified. Please refer to Section 4.2, "Resets," on page 42 for additional
information.
nRST
Configuration
Strap Pins
Output Drive
t_rstia
t_css
t_csh
t_odad
Figure 14.2 nRST Reset Pin Timing
SYMBOL
t_rstia
t_css
t_csh
t_odad
Table 14.7 nRST Reset Pin Timing Values
DESCRIPTION
MIN
nRST input assertion time
200
Configuration strap pins setup to nRST deassertion
200
Configuration strap pins hold after nRST deassertion
10
Output drive after deassertion
30
TYP
MAX UNITS
μS
nS
nS
nS
Note: Device configuration straps are latched as a result of nRST assertion. Refer to Section 4.2.4,
"Configuration Straps," on page 45 for details.
SMSC LAN9303/LAN9303i
351
DATASHEET
Revision 1.3 (08-27-09)