CT1611 Datasheet, PDF (19/24 Pages) Aeroflex Circuit Technology – DMA Controller with Buffer Memory,MIL-STD-1750A Compatible

Bit
9
10
11
12
13. 14
15
Name
GBR
RMD
BIT SET
AD ERR
SW CNT
BUS ACT ERR
Error Register con’t
Indication (When Set)
Good Block Received
Active BC mode only
Indicates valid message has been received by bus
controller, set even if transaction is otherwise
not valid.
Received Mode Data
Active only in BC mode
Indicates valid mode data has been returned from RT.
This bit is set even if transaction is otherwise
not valid.
Bit(s) set in returned status word(s). Active in BCC
mode only.
Indicates non masked bits in status word(s) are set.
Masked bits are masked in Transaction Word
Register.
Bits include:
Message error bit
Instrumentation bit
Service Request
Reserved Bit(s) (3 bits)
Broadcast Cmd Rcvd bit
Busy bit
Subsystem Flag
Dynamic Bus Control Acceptance bit
Terminal Flag
Address in status word(s) error active only in BC mode.
Indicates RTU address in returned status word(s) is incorrect.
Returned status word count.
Active only in BC mode.
Two bit non rollover counter for returned status words..
Bit 14
0
0
1
1
Bit 13
0
1
0
1
Count
None returned
One returned
Two returned
Three, or greater returned
Bus Activity Error
Active in BC mode only.
This bit is set if the bus is active when should be quiet following:
A. Returned mode data (indicates word count high)
B. After status in normal receive, mode without data, and non broadcast RT
to RT.
SCDCT1611 Rev A
19