User`s manual

Bit(s)
Designation
00,01
(Maintenance)
02,03
-
04,05 Extended Address
Read
06,07,08
-
09,10 Register Selection
Code
11-14
Asynchronous
Line
Card
Registers
15
Control Strobe
Table 3-4
Line
Control Register Bit Assignments
(For Asynchronous Line
Cards)
Function
Unused
For the secondary register selected by SRS 00-03
and 08-11, these bits display the contents of bits
16 and 17, respectively. This enables the program
to read the extended address bits
of the current
address and control table base address secondary
registers.
Unused
For the line number selected by SRS 00-03, the
code bits determine which Asynchronous Line
Card register is written into at LCR 15 set time.
There are four registers associated with each line
and they are called
"Primary," "Format," "Baud
Rate,"
and "Maintenance" registers. Descriptions
of the register bits are found in LCR 11-14.
Cleared by Initialize.
This
is the path provided for access to the line card
registers. Loading
of a register occurs at LCR 15
set time and is dependent on the line number
selected by
SRS 00-03, and the register selection
code set
in LCR 09-10. Each line has four 4-bit
registers associated with it, designated as:
"Primary," "Format," "Baud Rate," and
"Maintenance." These registers are cleared by
Initialize.
Bit assignment description of the
registers follows
LCR 15 functional description.
When set to a one, strobes LCR 11, 12, 13, 14 into
control storage for the register selection code set
in LCR 09-10 and the line specified by SRS
00-03, then clears itself. May be set at the same
time
as the LCR bits that it strobes into storage
for the selected register.
3-16
Read/Write
-
-
Read only
-
Write
Write
Write