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Chapter 3 Signals and Pinout Tables
COM 830 Reference Manual 27
AC_SYNC and AC_SDOUT can be used to switch PCI Express channels 1-4 between x1 and x4 mode. If
both signals are each pulled-up (using 1k resistors) to 3.3V at the rising edge of PWROK then x4 mode is
enabled. x1 mode is used by default if these resistors are not populated.
Table 3-3. Gigabit Ethernet Signal Descriptions
Gigabit Ethernet Description I/O PU/PD Comment
GBE0_MDI[0:3]+
GBE0_MDI[0:3]-
Gigabit Ethernet Controller 0: Media
Dependent Interface Differential Pairs 0, 1,
2, 3. The MDI can operate in 1000, 100, and
10Mbit/sec modes. Some pairs are unused
in some modes according to the following:
I/O
Analog
Twisted
pair signals
for external
transformer.
1000 100 10
MDI[0]+/- B1_DA+/- TX+/- TX+/-
MDI[1]+/- B1_DB+/- RX+/- RX+/-
MDI[2]+/- B1_DC+/-
MDI[3]+/- B1_DD+/-
GBE0_ACT# Gigabit Ethernet Controller 0 activity
indicator, active low.
OD
GBE0_LINK# Gigabit Ethernet Controller 0 link indicator,
active low.
OD
GBE0_LINK100# Gigabit Ethernet Controller 0 100Mbit/sec
link indicator, active low.
OD
GBE0_LINK1000# Gigabit Ethernet Controller 0 1000Mbit/sec
link indicator, active low.
OD
GBE0_CTREF Reference voltage for Carrier Board
Ethernet channel 0 magnetics center tap.
The reference voltage is determined by the
requirements of the module PHY and may
be as low as 0V and as high as 3.3V.
The reference voltage output shall be
current limited on the module. In the case in
which the reference is shorted to ground,
the current shall be limited to 250mA or
less.
REF Reference
voltage on
COM 830
is 1.8V
Table 3-4. Serial ATA Signal Descriptions
Signal Description I/O PU/PD Comment
SATA0_RX+
SATA0_RX-
Serial ATA channel 0, Receive Input
differential pair.
I SATA Supports Serial ATA
specification,
Revision 1.0a
SATA0_TX+
SATA0_TX-
Serial ATA channel 0, Transmit
Output differential pair.
O SATA Supports Serial ATA
specification,
Revision 1.0a
SATA1_RX+
SATA1_RX-
Serial ATA channel 1, Receive Input
differential pair.
I SATA Supports Serial ATA
specification,
Revision 1.0a
SATA1_TX+
SATA1_TX-
Serial ATA channel 1, Transmit
Output differential pair.
O SATA Supports Serial ATA
specification,
Revision 1.0a