6.0 FACTORY SERVICE MODE TESTING
SDRAM Read/Write Test
Steps
•
Scroll to “SDRAM Read/Write Test” using UP / Down Key
•
Press RIGHT to enter the test.
•
The test status and results will be shown on LCD. If the test is
successful, “SDRAM R/W TEST OK” is displayed on the LCD and if
the test fails “SDRAM TEST FAIL” will be displayed on the LCD.
•
This test can be exited in between the testing process by pressing
LEFT key.
Verification of SDRAM Read Write Functionality
To Verify SDRAM Read Write Functionality Write a pattern 0x55aa55aa to
a specific location and read back the data to verify the data Integrity.
SDRAM Self-Refresh Test
Steps
•
Scroll to “SDRAM Self Refresh Test” using UP / Down Key
•
Press RIGHT to enter the test.
•
The test status and results will be shown on LCD. If the test is
successful, “SDRAM self refresh TEST OK” is displayed on the LCD
and if the test fails “SDRAM self refresh FAIL” will be displayed on the
LCD.
•
This test can be exited in between the testing process by pressing
LEFT key.
Verification of SDRAM Self-Refresh Functionality
•
To verify the SDRAM self-Refresh functionality, we write a string
of characters to the SDRAM and put the SDRAM in self-refresh
mode for 5 Seconds and Check the data integrity before entering
and after leaving Self-refresh mode without any write action on
SDRAM.
<HDD084 SDRAM R/W Test >
< >
<
SDRAM Under Test
>
< >
<HDD084 SDRAM R/W Test >
< >
<
SDRAM R/W OK
>
< >
<HDD084 SDRAM >
< Self Refresh Test >
<
SDRAM Under Test
>
< >
HDD084 SDRAM
>
< Self Refresh Test >
<
SDRAM Self refresh FAIL
>
< >
