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UT1553B_

RTR Remote Terminal with RAM

Aeroflex UTMC 

1.4 Mode Code and Subaddress

The UT1553B RTR provides subaddress and mode code

decoding meeting MIL-STD-1553B. In addition, the device

has automatic internal illegal command decoding for

reserved MIL-STD-1553B mode codes. Upon command

word validation and decode, status pins MCSA(4:0) and

MC/SA become valid. Status pin MC/SA will indicate

whether the data on pins MCSA(4:0) is mode code or

subaddress information. Status Register bits 0 through 5

contain the same information as pins MCSA(4:0) and MC/

SA.

The system designer can use signals MCSA(4:0), MC/SA,

BRDCST, RTRT, etc. to illegalize mode codes,

subaddresses, and other message formats (broadcast and

RT-to-RT) via the Illegal Command (ILLCOM) input to the

part (see figure 21 on page 31).

RTR MODE CODE HANDLING PROCEDURE

T/R Mode Code

Function

Operation

0

10100

Selected Transmitter Shutdown 2

1. Command word stored

2. MERR pin asserted

3. MERR bit set in Status Register

4. Status word transmitted

0

10101

Override Selected Transmitter Shutdown 2

1. Command word stored

2. MERR pin asserted

3. MERR bit set in Status Register

4. Status word transmitted

0

10001 Synchronize (w/Data)

1. Command word stored

2. Data word stored

3. Status word transmitted

1

00000

Dynamic Bus Control 2

1. Command word stored

2. MERR pin asserted

3. MERR bit set in Status Register

4. Status word transmitted

1

00001

Synchronize 1

1. Command word stored

2. Status word transmitted

1

00010

Transmit Status Word 3

1. Command word stored

2. Status word transmitted

1

00011

Initiate Self-Test 1

1. Command word stored

2. Status word transmitted

1

00100 Transmitter Shutdown

1. Command word stored

2. Alternate bus shutdown

3. Status word transmitted

1

00101 Override Transmitter Shutdown

1. Command word stored

2. Alternate bus enabled

3. Status word transmitted

1

00110 Inhibit Terminal Flag Bit

1. Command word stored

2. Terminal Flag bit set to zero and disabled

3. Status word transmitted

1

00111 Override Inhibit Terminal Flag

1. Command word stored

2. Terminal Flag bit enabled, but not

set to logic one

3. Status word transmitted

1

01000

Reset Remote Terminal 1

1. Command word stored

2. Status word transmitted

1

10010

Transmit Last Command Word3

1. Command word transmitted

2. Last command word transmitted

1

10000 Transmit Vector Word

1. Command word stored

2. Status word transmitted

3. Data word transmitted

1

10011 Transmit BIT Word

1. Command word stored

2. Status word transmitted

3. Data word transmitted

Notes:

1. Further host interaction required for mode code operation

2. Reserved mode code; A) MERR pin asserted, B) MESS ERR bit set, C) status word transmitted (ME bit set to logic one).

3. Status word not affected.

4. Undefined mode codes are treated as reserved mode codes.

RTR-8

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