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UT1553RTMP

Remote Terminal Multi-Protocol

Aeroflex UTMC 

THESE THREE BLOCKS CAN

RESIDE ANYWHERE IN THE

64K MEMORY SPACE.

64-WORD

POINTER BLOCK

RECEIVE DATA

BUFFER(S)

TRANSMIT DATA

BUFFER(S)

64K x 16 SHARED

RAM

UT1553 RTMP

ADDRESS BUS

DATA BUS

CONTROL

HOST

SUBSYSTEM

UT63M125

1553 TRANSCEIVER

1553 BUS A

1553 BUS B

Figure 11. The Memory Link between the RTMP and the Host Subsystem

The host can program the 16-bit pointer addresses that make

up the Pointer Block to point to any memory location in the

RTMP’s 64K memory space. In this respect, the host has

total flexibility to determine where in RAM it stores the

actual transmit, receive, and mode code data. The RTMP’s

data storage flexibility allows the host to buffer 1553 receive

messages and maintain data integrity.

The host can update the pointer data within the Pointer

Block at any time, but the recommended procedure is for

the host not to update the pointer data for 1553 receive

command data while the RTMP is actively processing a

message. To prevent this action, the host can program the

RTMP to generate an end-of-activity interrupt for every

valid 1553 message with associated data words. In addition,

the host can read the Operational Status Register to

determine if the RTMP is active.

The RTMP uses the present 1553 command word and the

selected mode of operation, single or separate mode, to

determine which pointer within the 64-word Pointer Block

to use as an address pointer for the memory accesses during

1553 message activity. The 1553 command word T/R Bit

and the subaddress bits, or the mode code bits for a mode

command, specify the exact location of the address pointer

in the Pointer Block for transmit, receive, and mode code

command words. If the host has selected the single mode of

operation, the RTMP forces selection of the address pointer

stored in the single mode location for all receive commands.

The RTMP stores the present command word in the first

RTMP-18

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