BCRT-ACA ETC1 [List of Unclassifed Manufacturers], BCRT-ACA Datasheet - Page 6

• Manufacturer Part Number: BCRT-ACA
• Description: BCRT Bus Controller/Remote Terminal/Monitor
• Manufacturer: ETC1 [List of Unclassifed Manufacturers]

RTI-6
7
8
9
10
11
12
13
14
15
SYSTEM REGISTER (READ ONLY)
TERM
ACTV
MSB
[ ] defines reset state
[0]
MESS
VAL
[0]
MESS
ERR
[0]
TAPA
ERR
[0]
[0]
[1]
[0]
[0]
[0]
[0]
[0]
[0]
[0]
SELF-
TEST
[0]
BUSY
[0]
Figure 5. System Registers
TFEN
[1]
Channel B Enabled. A logic one indicates that Channel B is available for
both reception and transmission.
Channel A Enabled. A logic one indicates that Channel A is available for
both reception and transmission.
Terminal Flag Enabled. A logic one indicates that the Bus Controller has
not issued an Inhibit Terminal Flag mode code. A logic zero indicates that
the Bus Controller, via the above mode code, is overriding the host sys-
tem’s ability to set the Terminal Flag bit of the status word.
Busy. A logic one indicates the Busy bit is set. This bit is reset when the
SystemBusy bit in the Control Register is reset.
Self-Test. A logic one indicates that the RTI is in the self-test mode. This
bit isreset when the self-test is terminated.
TA Parity Error. A logic one indicates the wrong Terminal Address parity;
it causes the biphase inputs to be disabled and a message error condition.
This bit is reset by reloading the terminal address latch with correct parity.
Message Error. A logic one indicates that a message error has occurred
since the last System Register read. This bit is not reset until the System
Register has been examined and the message error condition is removed.
Valid Message. A logic one indicates that a valid message has been
received since the last System Register read. This bit is not reset until the
System Register has been examined.
Terminal Active. A logic one indicates the device is executing a transmit or
receive operation. The state of this bit is the logical NAND of the external
XMIT and RCV pins.
CH A
EN
[0]
CH B
EN
[0]
CHNL
A/B
[1]
MC/
SA
[0]
MCSA
4
[0]
MCSA
3
[0]
MCSA
2
[0]
MCSA
1
[0]
MCSA
LSB
0
[0]