Detailed Description
20. SPI Interface
The SPI interface is a four-wire, synchronous serial data bus configuration. The interface
utilizes a 64-Mb STMicroelectronics low-voltage, serial Flash memory device (U10), part
number M25P64, which can be used for FPGA configuration or to hold user data. An SPI
system typically consists of a master device and at least one slave device. For Virtex-5
FPGA configuration, the FPGA is the SPI master and the SPI Flash PROM is the slave
device. The SPI interface uses four signals ( Table 11 ) to communicate between the FPGA
and the Flash PROM device.
.
Table 11:
SPI Pins
Label
Pin Number for Package Type
FF324
FF676
FF1153
FF1760
Serial Clock (C)
Serial Data Out (Q)
Chip Select (S_N)
Serial Data In (D)
N8
R7
P10
P9
J10
K11
AA10
AA9
M13
N13
AE12
AE13
AF15
R14
AK14
AK15
The J2 connector allows users to connect a Parallel Cable IV ribbon cable to configure the
SPI device. For SPI programming, refer to the latest version of Xilinx iMPACT software tool
documentation. To set the Mode pins for SPI configuration, see the Virtex-5 FPGA
Configuration User Guide [Ref 3] . The PROGRAM pin must be held Low when configuring
the SPI device. After configuring the SPI device, the PROGRAM pin must be released to
configure the FPGA from the SPI device.
21. BPI Interface
The BPI interface is a x16 asynchronous bus configuration. The BPI device is a 256-Mb Intel
Strata Flash (U18), part number JS28F256P30. Table 12 shows the pin mapping from the
BPI device to the FPGA.
Table 12:
BPI Pins
Pin Number for Package Type
Label
FF324
FF676
FF1153
FF1760
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQ8
DQ9
Virtex-5 LX FPGA Prototype Platform
P12
P13
M11
N11
T13
T14
M10
N10
U8
V8
AA14
AA13
AB11
AA12
AB14
AA15
Y13
Y12
AC9
AC8
AC20
AC19
AE17
AD16
AE19
AD19
AF16
AE16
AG12
AH12
AJ27
AJ26
AL14
AL15
AK29
AJ28
AK13
AJ13
AM16
AN16
21
UG222 (v1.1.1) March 21, 2011
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