Publication No. SBC329-HRM/1
Connectors 111
7.1.7
Signal Descriptions
Table 7-8 Backplane Connector Signal Descriptions
Signal
Description
VS1, VS2, VS3
VPX Vs1 (+12 V), Vs2 (+3.3 V) and Vs3 (+5 V) power inputs. See the
P3V3_AUX
VPX +3.3 V DC auxiliary power input. See the
GND
The DC voltage reference for the system
None
No signals specified in VPX specification
N/C
No Connection
P12V_AUX,
N12V_AUX
VPX +12 V DC and -12 V DC auxiliary power inputs. Connected to the XMC site, otherwise unused by the SBC329
GA[4:0]~
Geographical Addressing bits. These are used to set the slave address of the SBC329. The settings are reflected in the
FPGA
Backplane Status Register (offset 0x6CA)
GAP~
Geographical addressing parity bit input. The sum of all GA bits, including the parity bit, should be an odd number. The
setting is reflected in the FPGA
Backplane Status Register (offset 0x6CA)
SM0_CLK,
SM1_DATA
System Management bus A clock and data. Connected to the BMM via I
2
C buffers. These allow access to certain on-board
resources from an external I
2
C master
SM2_CLK,
SM3_DATA
System Management Bus B clock and data.
SYSRESET~
System Reset. When this is low, it causes the system to be reset. The SBC329 generates SYSREST~ when it is configured
as System Controller
NVMRO
Non-Volatile Memory Read Only. When this signal is high, all on-board Non-volatile memory is write-protected. This signal
can be pulled low externally (using a link on the backplane or RTM) or driven low under software control by the SBC329 if
configured as System Controller. The state is shown in the FPGA
Backplane Status Register (offset 0x6CA)
JTAG_TDO,
JTAG_TDI
The SBC329 does not support boundary scan. JTAG_TDI and JTAG_TDO are connected together on the SBC329 to support
backplanes where a continuous daisy chain is required
REFCLK_P/N
OpenVPX Reference Clock differential signals. Optionally used as 100MHz PCIe REFCLK transmit/receive on the SBC329
PCIE_DPx_TXyP/N,
PCIE_DPx_RXyP/N
PCIe Data Plane fat pipe x (x = 01 or 02) transmit and receive differential pair y (y = 0 to 3)
SATAn_TXP/N,
SATAn_RXP/N
SATA interface n (n = 0, 1 or 2) transmit and receive differential pairs. TX is from SBC329 to external SATA device; RX is
from external SATA device to SBC329. All ports are Rev 3 capable
DVIx_DATA_nP/N,
DVIx__CLK_P/N,
DVIx_DDC_SCL,
DVIx_DDC_SDA,
DVIx_HPD
DVI channel x (x = 0 or 1) Transmit Data Signal n (n = 0 to 2) differential pair,
DVI channel x (x = 0 or 1) Transmit Data Signal clock differential pair
DVI channel x (x = 0 or 1) Display Data Channel clock output,
DVI channel x (x = 0 or 1) Display Data Channel data signal,
DVI channel x (x = 0 or 1) Hot Plug Detect input signal
USB_Px_P/N
USB2.0 port n (n = 0 or 1) differential pair
USB_P0_1_PWR
USB2.0 ports 0 and 1 power (shared, maximum 1A for both ports)
ETHn_xP/N
Gigabit Ethernet channel n (n = 0 or 1) signal x (x = 0 to 3) differential pair. 10/100/1000BASE-T operation
ETHn_RXP/N,
ETHn_TXP/N
Gigabit Ethernet channel n (n = 1 or 2) receive and transmit differential pairs. 10/100/1000BASE-BX operation, for inter-
board backplane connection only
GPIO[3:0]
General Purpose Input/Output signals
GDISC1
OpenVPX Gdiscrete1 signal
VBAT
3 V battery supply input to back up RTC
SYSCON~
Pulled low by the backplane to indicate that the board is the VPX System Controller. The state is shown in the FPGA
Backplane Status Register (offset 0x6CA)