UT1553RTMP View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

UT1553RTMP

Remote Terminal Multi-Protocol

Aeroflex UTMC 

Single Mode, Data Pointer - When the host selects the single

mode of operation (bit 4 of the BPD = 1), the pointer value

at location 31 (1FH) of the Pointer Block is the address the

RTMP uses to store all 1553 receive data, regardless of the

command word’s subaddress. After the RTMP has stored

all data associated with a 1553 receive command word, the

RTMP stores an updated pointer value back into location

31 of the Pointer Block. The updated pointer value points

to the next available location in memory.

Mode Code Pointer - The RTMP uses the pointer value

stored in location 32 (20H) of the Pointer Block when it

recognizes a valid mode code command with an associated

BIT 1 2 3 4 5 6 7 8 9 1 1 1 1 1 1 1 1 1 1 2

TIMES

01 23 45 678 90

COM-

MAND

51 5

51

WORD

REMOTE T

SYNCTERMINAL/

SUB-

ADDRESS/

WORD

COUNT/

P

A

ADDRESSR MODE MODE R

CODE

Figure 14. Command WordBit-Time Definitions

64-WORD POINTER

BLOCK

data word. A mode code with data word is only valid when

the RTMP is operating in the 1553B mode. When the RTMP

is operating in the 1553A mode, it does not recognize or

process any mode code with an associated data word.

• 1553A mode: No mode codes with data word al-

lowed.

• 1553A mode: MC/SA field = 00000 or 11111 is a

mode code.

• 1553B mode: MC/SA field = 00000 or 11111 is a

mode code.

The RTMP stores the pointer value from location 32

internally. The RTMP uses bits 15-4 of this pointer value to

point to a memory location of a data block containing the

data words associated with each mode code. Bits 3-0 of the

pointer address are the four least significant bits of the mode

code the RTMP received. These four bits specify the data

word within this data block that the RTMP uses for this

specific mode code. Figure 15 shows how the RTMP

handles mode codes with associated data words.

Transmit Data Pointers - Pointer Block address locations

33 - 62 (21H-3EH) contain the pointer values for each of

the 1553 transmit command word subaddresses. The RTMP

TWELVE MSBs

OF THE

STORED ADDRESS

A MODE CODE

WITH DATA WORD

POINTS TO THIS

LOCATION.

LOCATION

20H

MODE CODE

DATA BLOCK

12

16

16

4 MODE CODE

DATA WORD FOR WORD

DATA ADDRESS THIS MODE CODE

FOUR LSBs OF

THE MODE CODE

THIS 16-WORD BLOCK

(1)

CAN BE LOCATED ANYWHERE

IN THE 64K MEMORY SPACE.

MODE

COMMAND

TERMINAL

ADDRESS

T/

R

00000

MODE P

CODE A

R

SYNC

Note:

0000 Transmit Vector Word

0001 Synchronize with data

0010 Transmit Last Command

0011 Transmit BIT Word

0100 Selected Transmitter Shutdown

0101 Override Selected Transmitter Shutdown

Figure 15. Mode Code with Associated Data Word Memory Mapping

RTMP-20

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