R
Detailed Description
SPI Addressing
The SPI does not use an addressed-based system like the IIC bus interface uses. Instead,
devices are selected by dedicated Slave Select signals, comparable to a Chip Select signal.
Each SPI slave device needs its own Slave Select signal driven from the SPI master. This
increases the total pin count but decreases overhead and complexity, increasing the
available bandwidth and decreasing bus contention.
ML410 platforms employ a 25LC640, 64 kb EEPROM SPI device. Figure 2-20 shows the
FPGA and the EEPROM connected by the SPI bus.
FPGA (U 3 7)
S PI EEPROM (U19)
S PI B us
25LC640
UG0 8 5_19_120 3 05
Figure 2-20:
SPI EEPROM Device Interface
Table 2-37 shows the connections between the IIC/SMBus controller and the FPGA.
Table 2-37:
IIC and SMBus Controller Connections
UCF Signal Name
SPI_DATA_OUT
SPI_DATA_IN
SPI_CLK
SPI_DATA_CS_N
FPGA Pin (U37)
AJ22
AH22
AF21
AG22
Schematic Signal Name
SPI_DATA_OUT
SPI_DATA_IN
SPI_CLK
SPI_DATA_CS_N
Serial ATA
ML410 platforms provide two Serial ATA (SATA) host port connections via J25 and J26.
Each SATA host port connection provides AC-coupled connections to and from an MGT
on the FPGA. A 300 MHz differential reference clock is provided for use with the SATA
MGTs and logic used to support the SATA protocol. For more information, see the Virtex-4
RocketIO MGT User Guide [Ref 4] .
Serial ATA Description
Serial ATA is the next generation of the ATA family of interfaces. Providing a higher
throughput through a simpler and less expensive cable, Serial ATA maintains software
compatibility with older ATA implementations.
FPGA to Serial ATA Connector
ML410 platforms that are equipped with RocketIO transceivers provide for operation as a
Serial ATA host or device. The connection between the FPGA and the Serial ATA
connector is fairly simple, involving only four wires per connector, as well as a few
ML410 Embedded Development Platform
UG085 (v1.7.2) December 11, 2008
73
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