UT1553B/BCRTM-WCC0 View Datasheet(PDF) - Aeroflex UTMC

Part Name

Description

Manufacturer

UT1553B/BCRTM-WCC0

UT1553B BCRT/M bus controller/remote terminal/monitor. Lead finish gold. Total dose none.

Aeroflex UTMC 

6.1.3 Mode Code Descriptor Definition

Mode codes are handled similarly to subaddress

transactions. Both use the four-word descriptors residing in

the RT descriptor space to allow the host to program their

operational mode. Corresponding to each mode code is a

descriptor (see figure 9a). Of the 32 address combinations

for mode codes in MIL-STD-1553B, some are clearly

defined functions while others are reserved for future use.

Sixteen descriptors are used for mode code operations with

each descriptor handling two mode codes: one mode code

with an associated data word and one mode code without

an associated data word. All mode codes can be handled in

accordance with MIL-STD-1553B. The function of the first

word of the Mode Code Descriptor is similar to that of the

Subaddress Descriptor and is defined below. The remaining

three words serve the same purpose as in the

Subaddress Descriptor.

MODE CODE

#’S 0 & 16

MODE CODE

#’S 1 & 17

MODE CODE

#’S 2 & 18

REMOTE TERMINAL

DESCRIPTOR SPACE

STARTING ADDRESS

(RTDSSA) + 256

MODE CODE

#’S 15 & 31

RTDSSA + 320

Note:

Mode code descriptor blocks are also provided for reserved mode

codes but have no associated predefined BCRTM operation.

Control Word

Bit

Number Description

Figure 9a. (RT) Mode Code Descriptor Space

BIT 15

BIT 14

BIT 13

BIT 12

BIT 11

BIT 10

BIT 9

BIT 8

BIT 7

BITs 6-0

Interrupt on Reception of Mode Code (without Data Word).

Illegalize Broadcast Mode Code (without Data Word).

Illegalize Mode Code (without Data Word).

Reserved.

Illegalize Broadcast Mode Code (with Data Word).

Illegalize Transmit Mode Code (with Data Word).

Illegalize Receive Mode Code (with Data Word).

Interrupt on Reception of Mode Code (with Data Word).

Interrupt if Index = 0.

Index. Functionally equivalent to the index described in the Subaddress Descriptor. It applies to mode codes with

data words only.

INTERRUPT ON RECEPTION OF MODE CODE

(WITHOUT DATA WORD)

ILLEGALIZE BROADCAST MODECODE

(WITHOUT DATA WORD)

ILLEGALIZE MODE CODE

(WITHOUT DATA WORD)

RESERVED

ILLEGALIZE BROADCAST MODECODE

(WITH DATA WORD)

ILLEGALIZE TRANSMIT MODE CODE

(WITH DATA WORD)

ILLEGALIZE RECEIVE MODE CODE

(WITH DATA WORD)

INTERRUPT ON RECEPTION OF MODE CODE

(WITH DATA WORD)

INTERRUPT IF INDEX = 0

15 14 13 12 11 10 9 8 7 6

0

INDEX

MESSAGE STATUS LIST POINTER

DATA LIST POINTER

RESERVED

Figure 9b. (RT) Mode Code Descriptor

BCRTM-26

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