SMSC LAN9312 - Manual (Page 445)

High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface
Datasheet
SMSC LAN9312 445 Revision 1.4 (08-19-08)
DATASHEET
15.5.3 Power-On Configuration Strap Valid Timing
This diagram illustrates the configuration strap valid timing requirements in relation to power-on. In
order for valid configuration strap values to be read at power-on, the following timing requirements
must be met.
Note: Configuration straps must only be pulled high or low. Configuration straps must not be driven
as inputs.
Note: Device configuration straps are also latched as a result of nRST assertion. Refer to Section
15.5.2, "Reset and Configuration Strap Timing," on page 444 and Section 4.2.4, "Configuration
Straps," on page 40 for additional details.
Figure 15.3 Power-On Configuration Strap Latching Timing
Table 15.7 Power-On Configuration Strap Latching Timing Values
SYMBOL DESCRIPTION MIN TYP MAX UNITS
t
cfg
Configuration strap valid time 15 mS
VDD33IO
Configuration Straps
t
cfg
2.0V