Boot Strap Signals - Congatec XTX conga-XLX User Manual

6.8 Boot Strap Signals

Table 36
Signal Description of Boot Strap
Signals
AC_SYNC Serial Bus Synchronization.
AC_SDOUT Audio Serial Data Output to CODEC.
SUS_STAT# Suspend Status: indicates that the
system will be entering a low power
state soon.
DTR1# Data terminal ready for COM1
TXD1, TXD2 Data transmit for COM1/COM2
RTS1# Request to send for COM1
SIDE_A0..2 Secondary IDE Address bus
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 XTX
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
XTX ™ module to malfunction and/or cause irreparable damage to the module.
If it is necessary to drive a TTL input (or another input which sources or sinks significant
current) that uses the TXD1 signal, a CMOS-input buffer can be inserted in the signal
path so that this line is not pulled up or down by external circuitry during system reset.
Copyright © 2006 congatec AG
Boot Strap signal Descriptions
™ internally implemented resistors or chipset internally
I/O PU/PD
O 3.3V PU 10k 3.3V AC_SYNC is a boot strap signal (see
O 3.3V PU 10k 3.3V AC_SDOUT is a boot strap signal
O 3.3V PD 1k
O 5V PU 4k7 5V
O 5V PU 4k7 5V
O 5V PD 100k
O 3.3V
X800m12
Comment
caution statement below)
(see caution statement below)
SUS_STAT# is a boot strap signal
(see caution statement below)
DTR1# is a boot strap signal (see
caution statement below)
TXD1 and TXD2 are boot strap
signals (see caution statement
below)
RTS1# is a boot strap signal (see
caution statement below)
SIDE_A0 to A2 are boot strap
signals (see caution statement
below)
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