Expand Management Programming Manual

EVENT MANAGEMENT
4: ZEXP-EVT-DEV-ERR
For the multifunction controller, the status word can be inter-
preted as two bytes whose values identify the cause of the
controller interrupt, as follows:
Bits 0-7 Bits 8-15 Meaning
-------- --------- -------
0 0 No error
1 Error in data transfer to or from
Tandem system
3 Transfer aborted by channel
4 Data buffer DMA error
5 Peripheral port chip (PPC)
error
6 Read parity error
7 T-bus sequence error
8 Port transfer error
9 Data overrun
10 Data underrun
2 Controller ownership error
All values Port number of owning port
3 Controller in dead state (has
not received RESETUNIT EIO from
Tandem system)
4 Invalid EIO instruction sent to
controller
All values Value of EIO control field
5 Hard (unrecoverable) error
(this code should never appear
in this event message)
6 Change in interface to modem--
value in bits 8-15 is sum of
the values representing all of
the following conditions that
apply:
1 Data terminal ready
2 Request to send
4 Clear to send
8 Carrier detect
16 Data set ready
7 Controller error statistics are
being sent to I/O process
(this code should never appear
in this event message)
8 Incoming frame too large
8-14