[12] Standard RAM test
1
Key operation
120
→
TL
2
Functional description
Perform the following check for the standard RAM 32 KByte
SRAM. The memory contents should not be changed before and
after the check.
Perform the following processes for memory address to be
checked (1C0000H~1DFFFFH).
PASS1: Save memory data.
PASS2: Write data "0000H."
PASS3: Read and compare data "00H," write data "55H."
PASS4: Read and compare data "55H," write data "AAH."
PASS5: Read and compare data "AAH."
PASS6: Restore the memory data.
If a compare error occurs in the check sequence PASS1-PASS6,
an error print is made. If no error occurs through all address, the
check ends normally.
The following address check is performed further.
Check point address = 1C0000H, 1C0001H
1C0002H, 1C0004H
1C0008H, 1C0010H
1C0020H, 1C0040H
1C0080H, 1C0100H
1C0200H, 1C0400H
1C0800H, 1C1000H
1C2000H, 1C4000H
1C8000H, 1D0000H
S
R A M
T S
S R V
DOT DISPLAY:
7-SEGMENT DISPLAY:
Initialize the table pointer
Read check address from the
address table by pointer
sccess
Save data of check address
to the CPU register
Write data 55H to check
address
For check address other than
the current check address,
write AAH after saving 1-byte
data into the register
Is the
current check
address 55H?
Reset operation of saved data
Is the
operation comleted
for the other check
address?
Revise the table pointer
Is the
address table
completed?
End
YES
YES
YES
NO
Address
error
NO
NO
Check address
table
START
Table pointer
END
Operation flow
– 36 –
Summary of Contents for ER-A460
Page 49: ...2 Main PWB layout 48 ...
Page 57: ...13 Keyboard PWB layout 56 ...
Page 60: ... Top cabinet etc ER A460 I 34 RCPSO082 2 ...
Page 62: ...ER A460V Top cabinet etc ER A470 RCPSO083 4 ...
Page 64: ... ER A460V 9 RCPSO084 6 ...
