Copyright © 2006 congatec AG
C800m10
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6.5
Boot Strap Signals
Table 25 Boot Strap Signal Descriptions
Signal
Description of Boot Strap Signal
I/O
PU/PD
Comment
AC_SYNC
Serial Bus Synchronization.
O 3.3V PU 10k 3.3V AC_SYNC is a boot strap signal (see caution statement below)
AC_SDOUT Audio Serial Data Output to CODEC.
O 3.3V PU 10k 3.3V AC_SDOUT is a boot strap signal (see caution statement below)
SUS_STAT# Indicates imminent suspend operation; used to notify LPC devices. O 3.3V
PD 1k
Not supported
SUS_STAT# is a boot strap signal (see caution statement below)
Caution
The signals listed in the table above are used as chipset configuration straps during system reset. In this condition (during reset), they are
inputs that are pulled to the correct state by either COM Express
™ internally implemented resistors or chipset internally implemented resistors
that are located on the module. No external DC loads or external pull-up or pull-down resistors should change the configuration of the signals
listed in the above table. External resistors may override the internal strap states and cause the COM Express
™
module to malfunction and/or
cause irreparable damage to the module.
