3
SRAM
RAM.
Verifies the
A9
CPU SRAM (long-term) memory with a
non-destructive write/read pattern.
A
destructive version that writes
over stored data at power-on can be enabled by changing the 4th
switch position of the
A9
CPU switch as shown in Figure 10-2.
A9 CPU Assembly
s400
I
Normal Mode
Destructive SRAM
Test Enabled
Rocker
Slide
sge117e
Figure
19-2.
A9 CPU Switch Positions
4
Main DRAM. Verifies
the
A9
CPU main memory (DRAM) with a
non-destructive write/read test pattern.
A
destructive version of this
test is run during power-on.
For additional information, see Internal Tests (near the front of this
section) and the “Digital Control Troubleshooting” chapter.
1 O-8
Service Kay Menus and Error Messages
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