Channel Repower Feature; Chapter 3. Timer Feature In - IBM Series 1 User Manual

SUMMARY OF PUBLICATION
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This chapter introduces the reader
to the I/O channel and the user attachment features that are
described in the subsequent chapters. A block diagram shovs
where the user attachment features are located with respect
to the processor and the I/O channel. The attachment points
covered are:
• Processor I/O channel
Channel socket adapter fEature
Channel repower feature
• Timer feature
• Teletypewriter adapter feature
• Inteqrated diqital input/output non-isolated feature
• customer direct proqram control adapter feature
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The introduction to this
cha pter provides
a
qenera
1
description of the channel,
direct proqram centrol (DPC) operations, cycle steal (CS)
operations. interrupts, and initial program load (IPL).
•
•
•
•
The
remaininq sections of this chapter provide:
Siqnal line descriptions--this section includes
a
list
of the I/O channel siqnal lines and identifies groups
and subsets of the lines.
A
functional description is
included for each siqnal line.
Operational characteristics--this section consists
of
timinq charts and descripti
v€
text for the various
siqnal sequences that can occur on the I/O channel.
Special timinq requirements and maximum skew are shown
on the charts.
Electrical characteristics--this includes
(1)
electrical
requirements for dr1vers and receivers and
a)
other
attachment considerations.
Phvsical characteristics--this section provides
connector information includinq illustrations and signal
pin assiqnments. This information is supplied for the:
1.
I/O channel cahle connectors,
2.
Channel socket adapter feature, and
3.
C han
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repo werfea ture.
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The introduction to this
provides a qeneral descripticn of the timer
includinq a block diaqram.
chapter
feature
•
•
•
•
The remaininq sections of this chapter provide:
Detailed information about the timer signal lines.
Operational characteristics of timer interrupts.
Timer electrical characteristics--tbis includes driver
and receiver information for external control of
the
timers.
Timer physical characteristics--this section provides
connector information, including an illustration and
siqnal pin assiqnments for the connector located on the
printed circuit card.
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GA34-
0033
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