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For the CIU, the bits of the status word that are equal to 1 can
be interpreted as follows:
Bit
. 0
Power on (unit 0)
. 1
Channel underrun (write unit)
Channel overrun (read unit)
. 2
Channel abort
. 3
CIU detected channel parity error
. 4:7
Unused, should never be used
. 8
CIU internal hardware error detected
. 9
CIU internal microprogram error detected
. 10
Unused, should never be used
. 11:15
% 0
% 1
% 2
% 3
% 4
% 5
% 6
% 7
%10
%11
%12
%13
%14
%15
%16
%17
%20
%21
%22
%23
%24
%25
%26
%27
%30
%31
%32
%33
%34
%35
%36
%37
The values of param 1 , param 2 , and param 3 are always 0. They
are meaningless for the TR3271 subsystem.
Meaning
no data complete (no error)
data transfer complete (no error)
write ended and data not sent (retry)
CLB underrun (retry)
invalid CLB frame A field (ABORT)
CLB frame less than two bytes long (ABORT)
invalid CLB frame C field (ABORT)
FCS error on incoming CLB frame (param retry)
CLB received and aborted frame (param retry)
CLB receiver underrun (param retry)
incoming CLB bits not modulo 256 (param retry)
CLB output WAK timeout (param retry)
CLB input enable WAK timeout (OUTPUT)
FLAK timeout (clear retry)
CLIP/BOB protocol violation (clear retry)
reserved--should not happen (clear retry)
LOCS address out of range (ABORT)
LOCS block exceeds end of RAM (ABORT)
LOCS block sizes do not match (ABORT)
LOCS block invalid format (ABORT)
LOCS block bad checksum (ABORT)
execution address invalid (ABORT)
start execution issued and CIU
not loaded (ABORT)
invalid EIO command (ABORT)
invalid EIO parameter word (ABORT)
invalid EIO command for unit used (ABORT)
invalid NVRAM program (ABORT)
reserved--should not happen (ABORT)
reserved--should not happen (ABORT)
reserved--should not happen (ABORT)
reserved--should not happen (ABORT)
reserved--should not happen (ABORT)
TR3271 EVENT MANAGEMENT
4: ZTR3-EVT-CIU-ERR
7-13
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