Flash Connections - Xilinx Spartan-3A User Manual

Chapter 11: Parallel NOR Flash PROM

Flash Connections

Table 11-1
Although the XC3S700A/AN FPGA only requires just slightly over 2.6 Mbits per
uncompressed configuration image, the FPGA-to-Flash interface on the board supports up
to a 256 Mbit Flash. The Spartan-3A/3AN Starter Kit board ships with a 32 Mbit device.
Address lines SF_A<25:22> are not used.
In general, the Flash memory device connects to the FPGA to support Byte Peripheral
Interface (BPI) configuration, as described in
Table 11-1: FPGA-to-Flash Connections
84
shows the connections between the FPGA and the Flash memory device.
NOR Flash
Category Signal Name
NF_A25
NF_A24
NF_A23
NF_A22
NF_A21
NF_A20
NF_A19
NF_A18
NF_A17
NF_A16
NF_A15
NF_A14
NF_A13
NF_A12
NF_A11
NF_A10
NF_A9
NF_A8
NF_A7
NF_A6
NF_A5
NF_A4
NF_A3
NF_A2
NF_A1
NF_A0
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Table 11-1.
FPGA Pin
Number
G17 The upper four Flash addresses are not used
on the board. The board only has a 32 Mbit
G18
parallel NOR Flash PROM.
B21
B22
C21 Connects to FPGA pins A[21:0] to support
the BPI configuration.
C22
F21
F22
H20
H21
G22
H22
J20
J21
J22
K22
N17
N18
N19
N20
N21
N22
P18
R19
T18
T17
Spartan-3A/3AN Starter Kit Board User Guide
Function
UG334 (v1.0) May 28, 2007
R