User`s manual
3.1.4.3
3.1.4.4
3.1.4.5
3.1.4.6
3.1.4.7
3.1.5
3.1.5.1
3.1.5.2
3.2
3.2.1
3.2.2
3.2.3
3.2.4
3.2.5
3.2.6
3.2.7
3.2.8
3.2.9
3.3
3.3.1
3.3.2
3.3.3
3.3.4
3.3.5
3.3.6
3.3.7
3.3.8
3.3.9
3.3.10
3.3.11
3.3.12
3.3.13
3.3.14
3.3.15
3.3.16
3.4
3.5
3.5.1
3.5.2
3.6
3.6.1
3.6.2
3.6.3
3.6.4
3.6.4.1
3.6.4.2
3.6.5
3.6.5.1
3.6.5.2
CONTENTS (Cont)
Page
Control Byte Inhibit
...
. . . . . . . . . . . . . . . . . . . 3-7
Sync Character Selection . . . . . . . . . . . . . . . . . . . 3-7
Sync/Mark
State Select . . . .
..
............
3-7
Stripping Received Syncs
......................
3-7
Line Activity
Snapshot . . . . . . . . . . . . . . . . . . . . . . . . 3-7
Data Transfer Operations
....................
3-7
Provision for Alternate Data Transmission Tables
............
3-7
Table
Size and Location . . . . . . . . . . . . . . . . . . . . . . . . . 3-8
DIRECTLY-ADDRESSABLE
REGISTERS
..................
3-8
System Control Register (SCR) . . . . . . . . . . . . . . 3-8
Line Control Register (LCR)
..........
3-8
Receiver Interrupt Character Register (RIC)
....
3-15
NPR
Status Register (NSR)
..
. . . . . . . . . . . . . . . . 3-15
Reserved Register
.....
. . . . . . . . . . . . . . . . . . 3-20
Special
Functions Register
(SFR)
. . . . . . . . . . . . . . . 3-20
Secondary Register Selection Register (SRS)
....
. . . . . . . 3-20
Secondary Register Access Register (SAR)
.....
. . . . . . . 3-24
Modem Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
INDIRECTLY ADDRESSABLE (SECONDARy) REGISTERS
...............
3-29
Transmitter Principal Current Address
(0000)
. . . . . . . . . . . 3-29
Transmitter
Principal Byte Count (000
I)
..
. . . . . . . . . . . . . . 3-29
Transmitter Alternate Current Address
(0010)
..
.
..........
3-32
Transmitter Alternate Byte Count
(00
II)
. . . . . . . 3-32
Receiver Current Address
(0100)
.........
.
........
3-32
Receiver Byte Count
(0101)
............
.
..........
3-32
Transmitter Accumulated Block Check Character
(0110)
...............
3-32
Receiver Accumulated Block Check Character
(0111)
....
,
....
3-32
Transmitter Control Table Base Address
(I
(00)
. . . . .
...
. 3-33
Receiver Control Table
Base
Address
(100
1) . . . . . .
..
. . 3-33
Line
Protocol Parameters
(1010)
.......
. . . . . .
..
3-33
Line
State
(lOll)
...
. . . . . . . . . . . . . . . . . . . . . . . . .
..
3-33
Transmitter Mode Bits
(1100) . . . . . . . . . .
..
3-33
Receiver Mode Bits
(1101)
....
. . . . . . . . . .
..
3-33
Line Progress
(1110)
..........
.
..............
3-33
Receiver Control Byte Holding
(1111)
. . . . . . . . . . . . .
3-33
CONTROL BYTE
FORMAT.
. . . . . . . . . . . . . . . . . . . . . . . . . . 3-39
DVl1
INITIALIZATION . . . . . . . . . . . . .
..............
3-41
Line Modem
Set-Up . . . . . . . . . . . . . . . . . . . . . . . . . . 3-41
DVl1
Data Transfer
Setup.
. . . . . . . . . . . . . . . .
..
.
.....
3-41
DATA
TRANSFER IMPLEMENTATION
.......................
3-41
Originating and Answering Calls . . . . . . . . . . . . . . . . . . . . . . . . . . 3-42
Resynchronization During Reception . . . . . . . .
..
...........
. 3-42
Termination
of
Transmission and Reception
...........
. . 3-42
BISYNC Implementation
...
. . . . . . . . . . . . . . 3-43
Transmission Control
....................
. . 3-43
Reception Control . . . . . . . . . . . . . . . . . . . . . . . . 3-43
DDCMP Implementation
......
. . . . . . . . . . . . . . . . . . . . . . 3-47
Transmission Control . . . . . . . . . . . . . .
.....
3-47
Reception Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-48
iv