Artesyn ATCA-8310 Installation and Use (May 2014) - Manual (Page 261)

CPLD and FPGA
ATCA-8310 Installation and Use (6806800M72E) 261
8.1.5.5 IPMC SPI Interfaces
The IPMC can access CPLD and FPGA registers via SPI transactions. In the case of a Glue FPGA
register access the signals are routed thru the CPLD. In the other case of a CPLD register access
the CPLD internal IPMC SPI slave responds to such an IPMC SPI access. See the following figure.
8.1.5.5.1 Forwarding IPMC SPI Interface Signals to the Glue Logic FPGA SPI Interface
The IPMC uses this path to access Glue Logic FPGA registers with the chip select
H8S_SPI_FPGA_SS_ asserted. In this case the CPLD forwards the SPI signals to the FPGA SPI
interface.
8.1.5.6 FPGA SPI Interface
The FPGA SPI interface acts as a slave interface. The SPP can access CPLD registers via the SPI
interface.
8.2 Glue Logic FPGA
Figure 8-3 IPMC SPI Interfaces
CPLD
IMPC
SPI Master
Interface
H8S_SPI_SCK
H8S_SPI_FPGA_SS_
H8S_SPI_CPLD_SS_
H8S_SPI_MISO
H8S_SPI_MOSI
Glue
Logic
FPGA
SPI Slave
Interface
IPMC_SPI_SCK
IPMC_SPI_SS_
IPMC_SPI_MISO
IPMC_SPI_MOSI
IPMC
SPI Slave
Active H8S_SPI_CPLD_SS_:
Active H8S_SPI_FPGA_SS_: