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Functional Description
ECC Memory Controller
6
DRAM Memory
Compact FLASH Memory Card
6-22
ECC memory is provided by onboard DRAM devices. The DRAM
memory size ranges from 16MB to 256MB. The DRAM memory is
controlled by the Falcon chipset which performs two-way interleaving and
provides single-bit error correction and double-bit error detection. ECC is
calculated over 72-bits. Falcon provides single and double bit error
logging by latching the address and syndrome bits associated with the data
in error. The error is latched until cleared by software, unless the currently
logged error is single-bit and a new double-bit error is encountered. The
Falcon devices are connected to the processor data parity signals to
provide processor data bus parity generation and checking. The Falcon
memory controller also provides access to some of the system
configuration registers. Refer to the MCPN750A CompactPCI Single
Board Computer Programmer's Reference Guide (MCPN750A/PG) for
additional information and programming details.
The ECC DRAM memory consists of one or two banks which can be
populated to provide 16MB, 32MB, 64MB, 128MB, or 256MB. Each bank
is populated with nine 16-bit wide, 50-pin, TSOP DRAM devices to form
a 144-bit wide memory bank. The memory may be populated with 1Mx16
DRAM devices to provide 16MB or 32MB of DRAM. Alternatively,
4Mx16 DRAM devices may be used to provide 64MB or 128MB of
memory, or 8Mx16 DRAM devices may be used to provide 256MB.
Refer to the MCPN750A CompactPCI Single Board Computer
Programmer's Reference Guide (MCPN750A/PG) for additional
information and programming details.
The MCPN750A supports two EIDE compatible Compact FLASH
Memory Cards off of the PBC Primary EIDE interface. These Compact
FLASH memory cards reside on the TMCPN710 Transition Module. Once
configured, this memory will appear as a standard ATA (EIDE) disk drive.
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