User`s guide

DWMBB Adapter
3.12.4.4 ECC Errors on PMR Data During I/O Reads to PMR
The DWMBB/A module uses ECC to determine if there is an error on the
data being read from the PMR. These ECC errors can be correctable or
uncorrectable.
3.12.4.4.1 Uncorrectable ECC Errors
If an uncorrectable ECC error is found, the DWMBB does the following:
• Returns an RER and the corrupted read data with good parity to the
requesting XMI commander
• Sets PMR Uncorrectable ECC Error (AESR<12>)
• Logs the ECC syndrome in ACSR<28:17>
• Logs the address of the I/O command in AREAR
• Generates an INTR if Interrupt on Uncorrectable ECC Error
(AIMR<9>) is set
3.12.4.4.2 Correctable ECC Errors
If a correctable ECC error is detected on the PMR data during an I/O read,
the DWMBB does the following:
• Returns the corrected data with a CRD function code to the requesting
XMI commander
• Sets PMR Correctable ECC Error (AESR<13>)
• Logs the ECC syndrome in ACSR<28:17>
• Logs the I/O command address in AREAR
• Generates an INTR if Interrupt on Correctable ECC Error (AIMR<10>)
is set
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