Spartan-3A DSP 3400A Edition User Guide
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21
UG498 (v2.2) November 17, 2008
Spartan-3A DSP 3400A Edition Board Hardware
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Note
: Be sure that the power load of the connected PS/2 devices does not overload the
AC adapter of the development board.
12.
ZBT Synchronous SRAM
ISSI IS61NLP25636A-200TQL. The ZBT synchronous SRAM is high-speed, low-
latency external memory for the FPGA. The memory is organized as 256K × 36 bits,
providing a 32-bit data bus supporting four parity bits. The ZBT synchronous SRAM
shares the same data bus as the flash memory (
“10. Flash Memory”
).
Note
: FMC module #1 cannot be used when using ZBT synchronous SRAM. Make
sure that FMC #1 adjustable power supply is configured for 3.3V to use the memory.
See
“14. FMC Expansion Connector #1”
for information about configuring the
adjustable power supply.
13.
Soft Touch Connector
The Soft Touch connector (J12) lets you monitor signals between the FPGA and the
FMC expansion connector #1.
Table 1-8
defines the pin assignments.
Table 1-7:
PS/2 Pin Assignments
FPGA Pin
Description
R17
KEYBOARD_CLK
R18
KEYBOARD_DATA
H21
MOUSE_CLK
J21
MOUSE_DATA
Table 1-8:
Soft Touch Connector Pin Assignments
Soft Touch Pin
FPGA Pin
Description
A1
H2
FMC_LA03_P
A2
H1
FMC_LA03_N
A3
NC
GND
A4
J5
FMC_LA14_P
A5
J4
FMC_LA14_N
A6
NC
GND
A7
L4
FMC_LA06_P
A8
L3
FMC_LA06_N
A9
NC
GND
A10
P8
FMC_LA32_P
A11
P9
FMC_LA32_N
A12
NC
GND
A13
U1
FMC_LA28_P
A14
U2
FMC_LA28_N
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