Xilinx MIcroBlaze Development Spartan-3E 1600E Kit, User Manual

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MicroBlaze Development Kit Spartan-3E 1600 Edition User Guide 91
UG257 (v1.1) December 5, 2007 www.xilinx.com
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Chapter 12
SPI Serial Flash
The MicroBlaze Development Kit board includes a STMicroelectronics M25P16 16 Mbit
SPI serial Flash, useful in a variety of applications. The SPI Flash provides an alternative
means to configure the FPGA—a new feature of Spartan-3E FPGAs as shown in
Figure 12-1 . The SPI Flash is also available to the FPGA after configuration for a variety of
purposes, such as:
x
Simple non-volatile data storage
x
Storage for identifier codes, serial numbers, IP addresses, etc.
x
Storage of MicroBlaze processor code that can be shadowed into DDR SDRAM.
Figure 12-1:
Spartan-3E FPGAs Have an Optional SPI Flash Configuration Interface
Table 12-1:
SPI Flash Interface Signals
Signal FPGA Pin Direction Description
SPI_MOSI T4 FPGA Æ SPI Serial data: Master Output, Slave Input
SPI_MISO N10 FPGA Å SPI Serial data: Master Input, Slave Output
SPI_SCK U16 FPGA
Æ
SPI Clock
SPI_SS_B U3 FPGA Æ SPI Asynchronous, active-Low slave select input
S PI_MO S I
S PI_MI S O
S PI_ S CK
S PI_ SS _B
(T4)
(N10)
(U16)
(U 3 )
S p a rt a n- 3 E FPGA
D
C
Q
S
S PI S eri a l Fl as h
S TMicro M25P16
CCLK
DIN/D0
MO S I/C S I_B
C S O_B
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