Tio Word Format - HP 3000 III Series Manual

MCU/Main Memory Overview
I I I
I
I
I
01
2 3 4 5 8
71
s
9 10' 11
12
13
14
15
1
:J
\. J
Y
ZEROS
RROR
SIOOK
R/WOK
INT. PENDING
READ SCAN
DISWEC
L!U512K
=0
READ COPY E
TIO
Figure 6-10. TIO Word Format
6-45. CIa Command. CIa instructions may be executed only if TIO
bit 1
=
1 (R/W OK) except for a CIa master clear which can be
executed at any time. Figure 6-11 shows the word format of the
CIa instr uction •
Bit 0 Master Clear. When set, causes the FLI PCA to reset
and inhibits simultaneous Read Copy, Read Scan and/or
DISWEC CIa instructions, or aborts any of these
oper a tions.
Bit 2 Read Copy. Causes the contents of the lower or upper
5l2K Error Logging Array to be transferred to the I/O
Logging Array starting at the address location speci-
fied by bits 6 through 15 and ending at %1777. The
Read Copy is completed when the Address Counter rolls
over to %0000. During a transfer, TIO bit 1
=
0
(R/W
not OK) and goes to a 1 within 50 usec after comple-
tion of a copy. A Read Copy will be terminated by the
occurrence of a PFW, PON, I/O Reset or CIa Master
Clear. Read Copy will inhibi t a simultaneous Read
Scan and is aborted by a Master Clear.
6-24