Petra Sdram Size (S3); Table 1-3. Petra Sdram Size Settings - Motorola MVME177P Installation And Use Manual

Petra SDRAM Size (S3)

MVME177P boards use SDRAM (Synchronous DRAM) in place of
DRAM. For compatibility with user applications, the MVME177P's
SDRAM is configurable to emulate 4MB, 8MB, 16MB, 32MB, 64MB, or
128MB ECC-protected DRAM. Board configuration is a function of
switch settings and resistor population options.
S3 is a four-segment slide switch whose lower three segments establish the
size of the ECC DRAM memory model (segment 4 is not used.) Refer to
the illustration and table below for specifics.
.
Segment 1
ON
ON
ON
ON
OFF
OFF
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ON
4
1
32MB
(typical configuration)

Table 1-3. Petra SDRAM Size Settings

S3 S3
Segment 2
ON
ON
OFF
OFF
ON
ON
S3
OFF
PETRA SDRAM SIZE
2734 0004
S3 MCECC
Segment 3 DRAM Size
ON 4MB
OFF 8MB
ON 16MB
OFF 32MB
ON 64MB
OFF 128MB
Preparing the Board
1-9
1