Functional Description
ATCA-F140 Installation and Use (6806800M67H)
73
4.3.2
Memory Sockets
Two 240-pin DDR3 DIMM sockets are provided on the ATCA-F140 to host up to 2 GB of memory
in each DIMM socket using readily available single or dual rank DDR3 registered DIMMs. The
memory sockets are keyed for DDR3 modules using a 1.5 V supply voltage.
4.3.3
Memory Modules
The ATCA-F140 requires very low profile VLP DDR3 DIMM modules in order to fit within the
maximum component height profile of an ATCA blade. The ATCA-F140 comes standard with a
2GB SG572568EMR069P2SG module from Smart Modular. Operation with other memory
modules is not guaranteed.
Each DIMM module has a serial presents detect (SPD) SROM that provides all necessary
information (such as speed, size and type) to the boot firmware. The SPD SROM is read using
the I2C bus that is connected to the processor.
4.3.4
Persistent Memory
Persistent memory is part of the ATCA-F140 DDR memory subsystem. A dedicated register is
available in the FPGA to enable or disable persistent memory by software. If persistent memory
is enabled, the memory contents of the main memory stays unchanged after any applied reset,
except power-up reset. After power-up reset, the persistent memory features is disabled by
default.
A special procedure is followed to use the persistent memory feature.
Set DDR_SDRAM_CFG_2[SR_IE] bit inside the memory controller of the P2020 QorIQ
Integrated Processor.
Set these fields in the PIC of P2020 QorIQ Integrated Processor
–
EIVPRn[PRIORITY] to 0xF (highest priority)
–
EIDRn[EP]
Enable persistent memory feature by setting persistent memory bit inside the FPGA.
Any reset may occur except for power-up reset.
The FPGA generates and interrupt (IRQ_L[11]) to the P2020 QorIQ Integrated Processor.
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Содержание 6806800M67H
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