GE MEDICAL SYSTEMS PROPRIETARY TO GE
D
IRECTION 2294854-100, REVISION 3 LOGIQ™ 9 PROPRIETARY MANUAL
7-36 Section 7-8 - Preferred Test Strategy for PCI 9054 Interface
7-8-2 The PCI Interface Test Details
The following accesses to the VPD functionality must be performed with Configuration Reads/Writes.
Given the reserved diagnostic location in the VPD:
1.) Write the Lword 0x7856 3412 to the VPD location.
2.) Next, read back the entire Lword, and note its value, even if it's not what was written.
3.) Now, read back the data again, excluding the least significant byte, and ensure that the upper
three bytes match the upper three bytes of the data read back in step 2.
4.) Repeat steps 1-3 three more times, each time changing the excluded byte location.
5.) Finally, utilizing multiple writes and reads, walk ones and zeros up the AD lines (same address,
different data) to ensure that they are functioning.
Steps 1-4 will verify the C/BE# signal lines, even if the data read back is corrupt. Note that if the data is
too corrupt (the read in step 2 can't distinguish the bytes) then the test must fail. Otherwise, as long as
the byte reads match the corresponding bytes of the Lword read, the C/BE# signal lines are verified.
NOTE: If all of the reads performed here result in all 0's being read, there is likely a problem with the EEPROM,
not the PCI bus, itself. This should be reported to the user.
7-8-3 Verifying the PCI Interface Test
The following steps are suggested as a means of verifying a PCI Interface diagnostic that utilizes this
strategy:
• Check the C/BE# lines with a logic analyzer, to ensure that the byte-wide accesses are individually
asserting each of these signals.
• Corrupt the C/BE# lines and verify failure.
• Corrupt the AD lines and verify failure.
• Corrupt various pins on the EEPROM and verify failure.
NOTICE
The byte-wide access must not be implemented with an Lword access followed by a masking operation
on the host. This type of byte-wide access won't test the C/BE# signal lines.
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