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Magnetic Tape Control to Magnetic Tape Transport |
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|  MIL-D-81347C(AS)
(3) 1 Input Data Request
(4) 1 Interrupt
(5) 1 External Function Request
Magnetic Tape Control to Magnetic Tape Transport
3.5.2.4.1.4.2
3.5.2.4.1.4.2.1
General
(1) All communications between the MTC and the MTT shall be
via twisted pairs and data line driver/input amplifier combination, specified in Appendix II, unless
otherwise noted.
(2) A logical "l" shall be 0 + 0.5 -0.0 volts and a logical "O"
shall be 4 1 volts, unless otherwise noted.
(3) The MTT shall gate all signals with the select line, unless
otherwise noted.
Seven Data Lines - Seven Data lines, indicating the information
3.5.2.4.1.4.2.2
to be written on the taps, shall be transmitted to all MT'I"s.
Data Strobe - A Data Strobe line, indicating valid data to the MTT
3.5.2.4.1.4.2.3
shall be transmitted to all MTT's. The Data Strobe shall be a 2.0 microsecond (min.) pulse; the data
lines shall remain stable for the duration of the pulse and for 2 microseconds (min.) after the Data
Strobe pulse.
Select Line - One Select line shall be transmitted to each MTT
3.5.2.4.1.4.2.4
indicating the computer selection to the MTT. The Select line shall be a logical "l" as long as the
MTT is selected.
F o r w a r d - A Forward line, indicating to the MTT that it shall
3.5.2.4.1.4.2.5
move the tape in the forward direction, shall be transmitted to all MTT's. The Forward line shall be
logical "l" as long as the tape is to travel in the forward direction.
Reverse - A Reverse line, indicating to the MTT that it shall
3.5.2.4.1.4.2.6
move the tape in the reverse direction, shall be transmitted to all MTT's. The Reverse line shall be
a logical "l" as long as the tape is to travel in the reverse direction.
Rewind - A Rewind signal, indicating to the MTT that it shall re-
3.5.2.4.1.4.2.7
wind the tape to the load point, shall be transmitted to all MTT's. The Rewind signal shall be a logical
"l" for 2.0 microseconds (min.).
Read - A Read line, indicating to the MTT that it shall read data
3.5.2.4.1.4.2.8
from the tape, shall be transmitted to all MTT's. The Read line shall be a logical "1" as long as the
MTT is to read data.
Write - A Write line, indicating to the MTT that it shall write
3.5.2.4.1.4.2.9
data onto the tape, shall be transmitted to all MTT's. The Write line shall be logical "l" as long as
the MTT is to write data.
Write Reset - A Write Reset signal, indicating to the MTT that
3.5.2.4.1.4.2.10
it shall reset its write register, shall be transmitted to all MTT's. The Write Reset signal shall be
a logical "l" for 2.0 microseconds (min. ).
Three Packing Density - Three Packing Density lines, indicating
3.5.2.4.1.4.2.11
to the MTT a packing density of 800, 555.5, or 200 bits per inch, shall be transmitted to all MTT's.
Only one Packing Density line shall be a logical "l" at any one time; however, the chosen Packing
Density line shall remain a logical "1" for as long as the function being performed is active.
108
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