Bootstrap Signals; Table 29 Bootstrap Signal Descriptions - Congatec Qseven conga-QMX6 User Manual

9.1

Bootstrap Signals

Table 29 Bootstrap Signal Descriptions
Signal Pin # Description of Bootstrap Signal
GBE_LINK# 13
GBE_LINK100# 7
GBE_LINK1000# 8
GBE_ACT# 14
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 Qseven
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 Qseven
irreparable damage to the module.
Additionally, if it is necessary to have link and activity LEDs connected to GBE_LINK# and GBE_ACT# on the carrier board, then you have to
use buffers. Without a buffer, the strapping becomes active and this causes the PHY to be programmed with wrong address.
Copyright © 2013 congatec AG
Ethernet controller 0 link indicator, active low.
Ethernet controller 0 100Mbit/sec link indicator, active low. O 2.5VSB PU 1k 3.3V
Ethernet controller 0 1000Mbit/sec link indicator, active
low.
Ethernet controller 0 activity indicator, active low.
I/O PU/PD
O 2.5VSB PU 4k99
O 2.5VSB PU 4k99
O 2.5VSB PD 1k 3.3V
internally implemented resistors or chipset internally implemented resistors that
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QMX6m12
Comment
GBE0_LINK# is a bootstrap signal (see note below)
Not Supported. Internally connected to GBE_ACT#.
GBE0_LINK100# is a bootstrap signal (see note below)
Not Supported. Internally connected to GBE_LINK#
GBE0_LINK1000# is a bootstrap signal (see note below)
GBE0_ACT# is a bootstrap signal (see note below)
module to malfunction and/or cause
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