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Chapter 1: Introduction
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Provide PWM control of the fan speed
Provide fan tachometer readings
Generate interrupts/alarms based on readings
R
Connector P3 is a keyed three-pin fan header similar to the ones in computers. It is
designed to support a 5V DC fan. To bypass the fan controller device and operate the
fan at full speed, you can use connector JP9.
Under high-power operating conditions, a heat sink and/or fan for the FPGA can be
accommodated on the board (for example, Calgreg Electronics Smart-CLIP family of
heat sink/fan assemblies). The Spartan-3A DSP 3400A Edition board does not come
with a heat sink and/or fan.
Table 1-16:
FPGA Fan Controller Interface
Signal
FAN_ALERT
FPGA Pin
T17
Description
Interrupt to signal out-of-limit conditions.
23. Program and Reset Buttons
Button S10 forces the FPGA to be reprogrammed; button S9 forces the System ACE to
reset.
24. FPGA
XC3SD3400A-4FGG676C Xilinx Spartan-3A DSP FPGA. The board supports
configuration in several modes: JTAG, master serial, slave serial, master SelectMAP,
slave SelectMAP, byte-wide peripheral interface (BPI) up, BPI down, and SPI modes
See Chapter 2, “Configuration Options.”
The FPGA is also equipped with four I/O banks. Table 1-17 defines the I/O voltage
applied to each bank.
Table 1-17:
FPGA I/O Bank Voltage Rail
FPGA Bank
0
1
2
3
I/O Voltage Rail
FMC expansion connector #2 adjustable (1.5V, 1.8V, 2.5V, or 3.3V)
1.8V
3.3V
FMC expansion connector #1 adjustable (1.5V, 1.8V, 2.5V, or 3.3V)
25. JTAG Header
The JTAG header (P5) allows programming devices and troubleshooting the FPGA.
The JTAG port supports the Xilinx Parallel Cable III, Parallel Cable IV, or Platform USB
cable products. (Third-party configuration products may also be available.) The JTAG
chain can also be extended to the FMC expansion module when it is present. See
Chapter 2, “Configuration Options.”
32
www.xilinx.com
Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
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