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Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
Chapter 1:
Introduction
R
28.
RS232 Serial Port
This DB9 male connector allows the FPGA to communicate serial data to another
device. The port is wired as a host device (DCE) and configured to operate at up to
115200 bauds. For this reason, a null modem cable is normally required to connect the
board to the serial port on a computer. An interface device is used to shift the voltage
level between FPGA and RS232 signals.
Note:
The FPGA is only connected to the TX and RX data pins of the serial port. As
such, other RS232 signals such as hardware flow-control signals are not used. For this
reason, flow control should be disabled when communicating with a computer.
29.
SPDIF Output Connectors
The SPDIF connector J20 is used to output digital audio output.
30.
Configuration Jumpers
Ten configuration jumpers are present on the Spartan-3A DSP 3400A Edition board.
Table 1-21
defines how to use the configuration jumpers.
Table 1-20:
Serial Port FPGA Pin Assignments
DB9 Pin
FPGA Pin
Description
2
V14
TX
3
AA20
RX
Table 1-21:
Configuration Jumpers
Jumper
Function
On
Off
JP1
Prevents the USB
controller from running
the firmware in the I
2
C
EEPROM.
1-2: Does not run the
firmware from I
2
C
EEPROM
Runs the firmware from
the I
2
C EEPROM (default).
JP2
Ethernet modes
1-2: GMII (default)
2-3: RGMII
N/A
JP5
FMC #1 I/O bank voltage
selection
Voltage present a FPGA
and at FMC Connector J13
(default)
No voltage present a
FPGA and at FMC
Connector J13
JP6
Clock generator
programming mode
JTAG programming
(default)
I
2
C programming
JP7/
JP8
System ACE failsafe mode Failsafe mode enabled
when both jumpers are
populated
Failsafe mode disabled
when both jumpers are
unpopulated
JP9
Fan controller bypass
Fan controller bypassed
Fan controller is not
bypassed (default)
JP10
LCD backlight control
Backlight is on (default)
Backlight is off
JP11
FMC #2 I/O bank voltage
selection
Voltage present a FPGA
and at FMC Connector J19
(default)
No voltage present a
FPGA and at FMC
Connector J19
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