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RAMCHECK ERROR DISPLAY MENUOne of the many useful features of the RAMCHECK memory tester is its "Error Display Menu" that is automatically displayed when it detects an error while testing SDRAM devices. This information is also stored in the RAMCHECK's test log and remains in its internal memory until you run the test again or you turn the unit off.
The test log can be viewed anytime before you test another SDRAM device by simply pressing the "ESC" key to return to standby mode. Once in standby mode press "F4" then "F1" for "View Test Log", use "F4" to go forward through the screens and "F3" to go back to view the test log. Once finished simply press the "ESC" key to go back to standby mode.
The following is an example of a data bit error which will automatically halt the test and display the "Error Display Menu", which consists of several menus via the LCD display. The menu below is an example of the first menu that the RAMCHECK displays. Pressing F2/F3 will move the highlight every two bytes and pressing F3/F4 will go through the remaining menus.
In the above example bytes 7 and 8 are highlighted showing that byte 8 has a bit error displayed as a "F". The corresponding 8 bits per byte are displayed in the next line showing an "F" in bit 58. Pressing F4 will advance to the next menu.
In the above example the bottom line confirms that the bit error is DQ58 as the previous menu detected and located on pin 155 of the SDRAM module.
If you are troubleshooting and repairing your own modules and you have a block diagram of the SDRAM module, you can use this information to track down the chip or chips that are connected to DQ58 and pin 155 of the module. If you do not have a block diagram and you have the same module of the same type you can use an ohm meter to "ohm out" which chip or chips are connected to pin 155.
The rest of the following menus are for advanced users who understand the memory mapping of an SDRAM device.
Pressing F4 will advance to the next menu.
The bottom line in the above example shows the address location where the error was encountered.
Pressing F4 will advance to the next menu.
The bottom line in the above example shows that the error occurs in the address location as defined by the Row and Column. Pressing F4 will advance to the next menu.
The bottom line in the above example shows that the hexadecimal number mark by W: shows the pattern written to the module and the hexadecimal number mark by R: shows what was read to cause the reported error. Pressing F4 will advance to the next menu.
The bottom line in the above example only applies to SDRAM modules that are 72 bits or more which shows that the hexadecimal number mark by CB: is the pattern written to the CB or parity bits of the module and the hexadecimal number mark by E: shows what was read to cause the reported error. Since in this example the module used is by 64 bits this line is not active. If this was a by 72 bit module and there was an error on the parity bits you may see for example: CB: 0000 E: 0033. Pressing F4 will advance to the next menu.
The bottom line in the above example shows the "BY FUNC" which identifies the function that caused the error to result, in this case the array. Other functions include shorts, march up & down, page burst and others. Pressing F4 will advance to the next menu.
The bottom line in the above example shows the states of the S and DQM lines in hexadecimal where 0 or low is active along with the "Section under test Indicator" (B2/1). In the above example S = A which converted to binary = 1010 which shows that S2 & S0 were active when the error occured. It is the same for the DQM's where DQM = 0F converted to binary = 0000FFFF which shows that DQM 7,6,5,4 were active when the error occur. The "Section under test Indicator" shows the Bank and Group where the error occured. In the above example B2 = Bank 2, B1 if displayed instead would equal Bank 1. The "1" indicates what group of 32 bits of the SDRAM device data bus is mapped into the RAMCHECK's own internal 32 bit bus, which is bits 63-32, Group "0" if displayed instead would represent bits 31-0.
The bottom line in the above example shows the "BUS CODE" which is used for product development. It details how we internally map the processor to the module. This is shown only so the customer can provide us with this information in case of a compatibility issue. Pressing F3 will go back through the menus or you can press the ESC key to go back to standby mode and view the test log described above to further view the error or errors the RAMCHECK has reported.
Many other errors can also be detected by the RAMCHECK, including Address Errors, Data Stuck Bits, Control Line Errors and Connector Wiring Errors.
If you have additional questions, please feel free to email us at email@example.com. Please remember to include your phone and fax numbers.
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