User`s guide

DWMBB Adapter
3.12.8.4 DMA Read Data Parity Error during DWMBB/A Module Loopback
If an XMI parity error is detected on DMA read data during a loopback
mode, PE and either RSE, NRR, or TTO set. An RER is returned to the
originating XMI node and INTRs are generated if the appropriate enable
bits in AIMR are set.
3.12.8.5 Cable OK Error
Cable OK (AESR<31>) sets to indicate that all four cables connecting the
DWMBB/A module to the DWMBB/B module are correctly installed and
that the DWMBB/B module is receiving DC power. Otherwise, the bit does
not set.
When Cable OK is not set, the DWMBB/A module NO ACKs all I/O
references to either the DWMBB/B module registers or VAXBI I/O space.
I/O references to DWMBB/A module register space are not affected by the
state of Cable OK.
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