
Chapter 11: Parallel NOR Flash PROM
R
Flash Connections
Table 11-1 shows the connections between the FPGA and the Flash memory device.
Although the XC3S700A FPGA only requires just slightly over2.6 Mbits per uncompressed
configuration image, the FPGA-to-Flash interface on the board supports up to a 256 Mbit
Flash. The Spartan-3A 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 Spartan-3A FPGA to support Byte
Peripheral Interface (BPI) configuration, as described in
Table 11-1 .Table 11-1:
FPGA-to-Flash Connections
NOR Flash
FPGA Pin
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
Number
G17
G18
B21
B22
C21
C22
F21
F22
H20
H21
G22
H22
J20
J21
J22
K22
N17
N18
N19
N20
N21
N22
P18
R19
T18
T17
Function
The upper four Flash addresses are not used
on the board. The board only has a 32 Mbit
parallel NOR Flash PROM.
Connects to FPGA pins A[21:0] to support
the BPI configuration.
86
Spartan-3A FPGA Starter Kit Board User Guide
UG330 (v1.3) June 21, 2007