UT1553B/BCRT-ACA0 Просмотр технического описания (PDF) - Aeroflex UTMC

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UT1553B/BCRT-ACA0

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

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RAM

DATA

BCRT

ADDRESS

MEMORY

CONTROL

BUFFER

DUAL

TRANSCEIVER

ARBITRATION

XFMR XFMR

CPU

BUS A

BUS B

1553 BUS

Figure 3d. CPU/BCRT Interface -- DMA Configuration

.

BCRT

TIMERON

CHANNEL A CHANNEL B CHA/B

CHANNEL A

CHANNEL B

TXINHA

DUAL

TRANSCEIVER

TXINHB

Figure 4. Dual-Channel Transceiver

The BCRT also provides a TIMERON signal output and an

active channel output indicator (CHA/B) to assist in meeting

the MIL-STD-1553B fail-safe timer requirements (see

figure 4).

6.0 REMOTE TERMINAL

ARCHITECTURE

The Remote Terminal architecture is a descriptor-

based configuration of relevant parameters. It is composed

of an RT Descriptor Space (see figure 5) and internal, host-

programmable registers. The Descriptor Space contains

only descriptors. Descriptors contain programmable

subaddress parameters relating to handling message

transfers. Each descriptor consists of four words: (1) a

Control Word, (2) a Message Status List Pointer, (3) a Data

List Pointer, and (4) an unused fourth word (see figure 6.)

These words indicate how to perform the data transfers

associated with the designated subaddress.

A receive descriptor and a transmit descriptor are associated

with each subaddress. The descriptors reside in memory

and are listed sequentially by subaddress. By using the

index within the descriptor, the BCRT can buffer incoming

and outgoing messages, which reduces host CPU overhead.

This message buffering also reduces the risk of incoming

messages being overwritten by subsequent

incoming messages.

Each descriptor contains a programmable interrupt structure

for subsystem notification of user-selected message

transfers and indicates when the message buffers are full.

Illegalizing subaddresses, in normal and broadcast modes,

is accomplished by using programmable bits within the

descriptor (see the RT Functional Operation section on

next page).

BCRT-21

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