Control Data Corporation 6000 Series Reference Manual page 25

5) After transmission of the cyclic code word, a sync word is not transmitted
for 300 µsec.
This delay allows the receiving DSC to recognize the end of
the data block and check the code word.
Receive Mode
The following 6675 signals are interchanged between the Data Channel, the 6675, and
a data set during a receive operation. Data is transferred from a remote station to
the local computer. Refer to Figure 3-6 for a signal flow diagram.
D
"""
A
-
"""
T
A
~
c
11
n
-
A
N
N
"""
-
E
L
"""-
.....
FUNCTION
_
...
-
EXF CODE
_...
...,
-
RECEIVE DATA (RO)
ACTIVE
-
INACTIVE
SERIAL CLOCK
\CTIVE
_
....
-
RECEIVE (SCA)
""""""' :
INACTIVE
~
,.
6675
FULL
*
CARRIER ON (COOi
EMPTY
......
lIT)
*
--,.
INTERLOCK
INPUT DATA
STATUS-ALL
*
CONTINUOUS SIGNAL
Figure 3-6. Receive Mode
Receive Mode Programming Example
Initial Conditions
DATA
SET
The 6675 is operational but no transmit or receive operation is in process. The
operation of only one DSC is described; the operation of the other three DSC's is
identical. The following sequence assumes that the COO and SC R data set signals
are present and all units are cleared.
3-12 Rev. A