Yamaha DRX-2 Service Manual page 26

DRX-2
SDRAM
Nucleus Name
Nucleus Number
Description
Technical
Execution Time
User Input
Error
Example
Nucleus Name
Nucleus Number
Description
Technical
Execution Time
User Input
Error
Example
Nucleus Name
Nucleus Number
Description
Technical
Execution Time
User Input
Error
Example
26
DS_SDRAM_WriteRead
400
Check all data lines, address lines and memory locations of the SDRAM
- Test the databus
- Test the addressbus
- Test the integrity of the device itself (memory locations)
11 seconds
None
Number Description
40000 The write-read test succeeded
40001 The data bus contains an error
40002 The address bus contains an error
40003 The SDRAM itself contains an error
DS:> 400
040000:
Test OK @
DS_SDRAM_WriteReadFast
401
Check all data lines and address lines of the SDRAM
- Test the databus
- Test the addressbus
Less than 1 second
None
Number Description
40100 The write-read test succeeded
40101 The data bus contains an error
40102 The address bus contains an error
DS:> 401
040100:
Test OK @
DS_SDRAM_Write
402
Write to a specific memory address
- Decode the user input and check its ranges and alignment on 4 bytes
- Writethe data to theSDRAM
Less than 1 second
1. The location that must be modified
( SDRAM starts at address 0xA0000000 )
2. The value to put on the selected location
Number Description
40200 Writing to the SDRAM succeeded
40201 Writing to the SDRAM failed; Wrong user input
40202 Address is not dividable by 4
DS:> 402 0xa1000010 0xad112222
040200:
Test OK @