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Chapter 1: Introduction
Table 1-10:
FMC #1 Expansion Connector Pin Assignments (2) (Cont’d)
R
FMC Pin
G34
G35
G36
G37
G38
G39
G40
FPGA Pin
V5
NC
T10
T9
NC
NC
NC
Signal
0_LA31_N
GND
0_LA33_P
0_LA33_N
GND
VADJ
GND
FMC Pin
H34
H35
H36
H37
H38
H39
H40
FPGA Pin
R8
R7
NC
P8
P9
NC
NC
Signal
0_LA30_P
0_LA30_N
GND
0_LA32_P
0_LA32_N
GND
VADJ
15. Power Supply Devices
The power supply circuitry of the Spartan-3A DSP 3400A Edition board generates
0.9V, 1.2V, 1.8V, 2.5V, 3.3V, and 12V, as well as two adjustable voltages to power the
components of the board. The 1.2V (PS3), 1.8V (PS5), 2.5V (PS2), 3.3V (PS4), FMC #1
adjustable (PS1) and FMC #2 adjustable (PS6) supplies are driven by Linear
Technology LTM4601 switching power regulators. The regulators are driven by a 620-
kHz clock, making them run synchronously and reducing noise caused by beat
frequencies. The clocks sent to each regulator are out of phase to reduce reflected noise
at the input.
The adjustable devices are user configurable through the FPGA and are used for the
VCCIO of the FPGA banks connected to the FMC expansion connectors. When no
FMC expansion module is present, the output voltage of PS1 should be set to 3.3V with
the I 2 C bus interface to configure the digital potentiometer (U23). See “I2C Bus
Addressing” for detailed information.
Figure 1-3 illustrates the power supply architecture and maximum current handling
by each supply. The typical operating currents are significantly below the maximum
capacity. The power supply delivered with the Spartan-3A DSP 3400A Edition board is
generally suitable for most applications.
26
www.xilinx.com
Spartan-3A DSP 3400A Edition User Guide
UG498 (v2.2) November 17, 2008
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