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Functional Description
Onboard SDRAM
3
Bank A SDRAM
Memory Size
32 Mbytes
64 Mbytes
128 Mbytes
Optional Memory Mezzanines
3-8
The PrPMC750 onboard ECC SDRAM memory, Bank A, consists of one
bank of five, 16-bit wide, 3.3V SDRAM devices in 54-pin TSOPII
packages. The total onboard memory size can be 32MB, 64MB or 128MB
depending on the memory type used. Refer to the following table for
memory options. The SDRAM memory is controlled by the Hawk ASIC,
which provides single-bit error correction and double-bit error detection.
ECC is calculated over 72-bits. Refer to the PRPMC750 Processor PMC
Module Programmer's Reference Guide (PRPMC750A/PG) for additional
information and programming details. The SDRAM memory bus operates
at the same speed as the processor bus.
Table 3-2. Onboard SDRAM Memory Size Options
Device Size
64 Mbit
128 Mbit
256 Mbit
The PrPMC750 may be populated with an optional memory expansion
connector, which will allow a memory mezzanine card to be attached. The
memory mezzanine connector provides signals to support from one to four
additional banks of SDRAM on the mezzanine. The memory mezzanine
will support two banks of 9 devices and two banks of 5 devices, as shown
in
Figure
3-2.
Device Organization
4Mx16
8Mx16
16Mx16
Computer Group Literature Center Web Site
Number of
Devices
5
5
5
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