Publication No. 500-9300527837-000 Rev. A.0
Connectors 93
Figure 7-3 RS422/485 Signal Definition
SYS_CON~
Pulled low by the backplane to indicate that the board is the VPX System Controller. The state is shown
Backplane Status Register (0x6CA)
.
MASKABLE_RST~
OpenVPX Maskable Reset signal. Pulling this input low for a minimum of 10 ms will cause a hard reset
to the SBC347A unless it is masked (unmasked by default). This pin can also be driven by the SBC347A
via the FPGA.
COM1_TXD,
COM1_RXD,
COM1_RTS~
COM1_CTS~
Serial COM port 1 Transmit Data,
Receive Data,
Ready To Send output and
Clear To Send input signals (RS232 mode)
COM2_RXD_RXDA,
COM2_TXD_TXDA,
COM2_RTS_TXDB,
COM2_CTS_RXDB
Serial COM port 2 Receive Data signal (RS232 mode) or Receive Data A signal (RS422 mode),
Transmit Data signal (RS232 mode) or Transmit Data A signal (RS422 mode),
Ready To Send output signal (RS232 mode) or Transmit Data B signal (RS422 mode),
Clear To Send input signal (RS232 mode) or Receive Data B signal (RS422 mode).
See
Section 5.8.1 "RS422/RS485 Mode"
on
PCIE_RST~
Reserved for future use/not currently implemented
BITFAIL~
Open drain BIT Fail drive for system level BIT Fail
VGA_RED
VGA_GREEN
VGA_BLUE
VGA_HSYNC
VGA_VSYNC
VGA_DDC_DATA
VGA_DDC_CLK
VGA Red,
Green,
Blue,
Horizontal Synchronization,
Vertical Synchronization,
Display Data Channel Data and
Display Data Channel clock signals
SEQ_IN
Inter-board Power Supply Unit (PSU) Sequencing input. The board will not start its onboard supplies
while this signal is driven low. This can be connected to the SEQ_OUT signal of another board to allow
the boards to power up in sequence. A 500 ms timeout applies, in case the preceding board has a fault.
This pin may be left unconnected if inter-board power sequencing is not required.
SEQ_OUT
Inter-board PSU Sequencing output. Driven low when the backplane supplies are out of specification
and held low until all onboard supplies are in specification.
Table 7-12 Backplane Connector Signal Descriptions (Continued)
Name
Description