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Function
Loads a Control Word into the referenced chan-
nel. This command will be unconditionally accepted
by the channel regardless of its Busy status.
• Initialize -
This command will cause the
MTC to reset to the same state that it enters
after power up or Master Clear. When an ini-
tialize command is received by the MTC all of
its channels are initialized (regardless of
which channel the command was received
over).
Operations that are in progress in the MTC at
the time of the Initialization will be abruptly
terminated and all registers will be ini-
tialized, including control registers device
select and control signals to the drives. No
information about the terminated operations
will be retained and no interrupts for the
operations will
be
generated. The interrupt
level for all channels will be set to Zero (inter-
rupts blocked).
• Stop I/O - This command causes any opera-
tion currently active on the spec:;ified channel
to be abruptly terminated.
If
a data transfer
operation is in progress, it will not be com-
pleted. An Interrupt will be generated for the
operation terminated by this command as if
the operation had come to a normal ending
point. Status, Configuration, and Range infor-
mation, present in the MTC when this com-
mand is received, will be retained.
• Test Mode - When an Output Control Word
command is received with the Test Mode bit on
(while the MTC is in normal operating mode),
the MTC will enter Test Mode. Once the MTC
is in Test Mode, subsequent commands cause
the contents of the Data Bus to be loaded into
the MTC instruction register (the Data Bus
contains the microinstruction). One clock
cycle is then issued to execute the micro-
instruction loaded. This enables a sequence of
microinstructions to be executed in a single
step mode from a software test routine.
Test Mode operates on an entire MTC and,
therefore, precludes normal usage of other
devices on the MTC at the same time. Normal
mode is resumed when a "reset test mode"
microinstruction is executed or when Master
Clear is activated on the Bus. All function
codes which are received over the Bus while
the MTC is in the Test mode will cause the
contents of the Data Bus to be loaded into the
MTC instruction register as described above
(function code field of the Address Bus is
ignored). Note that Response cycles will not be
generated for Input commands.
INPUT COMMANDS
Command
Input Range
PROGRAMMING
2-8
Function Code
OC
Format
Request
Cycle
7 8
Not Used
1
Data8us
Address Bus
f&~el
Number
Vlce)
{
IO
o
9 10
15
[1~=CM==ME(~fi~u=m=be=r=~II;;;;;~~1
1
{
0
Function
7 8
Not Used
Data Bus
Address Bus
Channel Number
(CP)
IS
Range Register
1
1718
23
1718
23
Causes the current contents of the referenced
channel's Range Register to be transferred to the
requesting channel.
During the Response cycle (Second Half Read),
the MTC will return in bits 8-23 of the Address Bus
the same data that was received in bits 0-15 of the
Data Bus during the Instruction Cycle.
After the completion of a read operation, the con-
tents of the Range Register reflect the status of that
transfer with respect to the physical block read.
• If the contents are a positive value greater
than zero and bit 8 of Status Word 1, Unequal
Length Check is set to a logical One, the
length of the physical block was less than the
range.
• If the contents are zero and bit 8 of Status
Word 1 is equal to One, the length of the
physical block was greater than the original
range.
• If the contents are zero and bit 8 of Status
Word 1 is equal to Zero, the length of the
physical block was equal to the original range.
Command
Input Configuration Word
Function Code
10
Format
7 8
Not Used
Data Bus
Address Bus
ChaMel Number
(Tape)
Request {I
0
Cycle
0
9 10
IS
~I ==c=M=(:~N:)u=~=er==:~I~_-==_-==_~~~1
7 8
Not Used
Data Bus
Address Bus
Channel Number
(CP)
Response {I
0
Cycle
,-"0 _ _ _ _ _ _ _ _ ----'""1.,,5
I
Configuration Word
I
' - - - - - - - - - - - - - ' .
1718
23
10
I
0 0 0 01
1718
23
CFIO
(
'\.
./
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