CT2565 datasheet(19/31 Pages) AEROFLEX

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SCDCT2565 REV B 8/10/99 Plainview NY (516) 694-6700

NAME

Definition

GAP TIME

NODT low time. 2MHz Clock

allows 500ns increments to

128µs (remains static at FF on

overflow).

WORD TRANSFER

Logic "1" indicates successful

transfer to subsystem.

WORD TRANSFERRED

Indicates successful transfer

(See bit 7)

VALID WORD

Reset (1) indicates Manchester

error, Parity error, Low Bit Count

and/or Status sync field.

COMMAND SYNC

Logic "1" indicates Command or

Status sync field. Logic "0"

indicates data sync.

CHAN A/B

Logic "1" if word received on

1553 bus Channel B.

WORD GAP

Set (0) if current word was

received at least 2µs after

receipt of previous word (parity

to mid-sync).

Note: Subsystem should clear entire memory prior to start of MT

operation.

Figure 20 – Identification Word

MT Operation

the

mode,

the

CT2565

captures

all

valid

transmissions on both channels of the 1553 bus, allowing

the user to monitor bus activity. Each word is transferred to

the subsystem along with an identification for interpretation

of the 1553 data stream.

MT Initialization

Initialize the CT2565 for MT operation per Table 2.

The

CT2565 will remain in an idle state until BCSTART (pin 41)

is pulsed low. Figure 21 illustrates MT operation.

Valid words received by the CT2565 are transferred to the

subsystem along with an identification Word by a single

DMA handshake with two memory-write operations shown

in Figure 22, MT Transfer Timing. Since the decoder will

reject words based on sync field errors and/or errors in the

first 2 non-sync bits, these words will not be processed

further (i.e., the subsystem will receive no indication of the

receipt of this word).

YES

ERROR

INCREMENT MEM ADDR

IDENTIFICATION WORD

MEMORY WRITE

DMA

NODT LOW

SYNC + 2 BITS

DECODER CHECK

ACTIVITY

1553 BUS

START MT OPERATION

(START-UP ONLY)

INITIALIZATION

START

1553 INPUT

MEMORY WRITE

8 7

GAP TIME

WORD TRANSFER

LOGIC "1"

VALID WORD

COMMAND SYNC

CH A/B

WORD GAP

SET TO "0"

Figure 21 – MT Operation Flow Chart

Notes:

(1) Steps marked with " __ _" indicates operation is

transparent to user.

(2) Steps marked with " ___" indicates user interaction

required.

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