ACT3492 datasheet(12/49 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCD3492 REV B 6/26/01 Plainview NY (516) 694-6700

Pin Description

Signal

Direction

Signal Description

RTAD 0-4

INPUT

K6,K5

J5,H5

RT address lines - These should be hardwired by the user.

RTAD4 is the most significant bit.

RTADPAR

INPUT

RT address parity line - This must be hardwired by the user to

give odd parity.

BIT DECODE

INPUT

Bitword Decode - When held low, prevents resetting TXTO Bit,

HSFAIL Bit, and LTFAIL Bit in the BIT Word (as well as TF and

SSF Bits in the Status Word) upon receipt of a Transmit Bit

Word Mode Command.

BCSTEN 1

INPUT

Broadcast command enable Bus 1 - When low the

recognition of broadcast command is prevented on Bus 1.

BCSTEN 0

INPUT

Broadcast command enable Bus 0 - When low the

recognition of broadcast command is prevented on Bus 0.

6MCK (Clock)

INPUT

6 Megahertz master clock.

IH 08 (LSB)

IH 19

IH 210

IH 311

IH 412

IH 513

IH614

IH715 (MSB)

BIDIR

Internal Highway - Bi-directional 8 bit highway on which 16 bit

words are passed in two bytes. IH 715 is the most significant bit

of each byte, the most significant byte being transferred first.

The highway should only be driven by the subsystem when data

is to be transferred to the RT.

DTRQ

OUTPUT

K10

Data Transfer Request - Goes low to request a data transfer

between the ASIC and subsystem. Goes high at the end of the

transfer.

DTAK

INPUT

Data Transfer Acknowledge - Goes low to indicate that the

subsystem is ready for the data transfer.

IUSTB

OUTPUT

Interface Unit Strobe - This is a double pulse strobe used to

transfer the two bytes of data

H/L

OUTPUT

High/Low - Indicates which byte of data is on the internal

highway. Logic level "0" for least significant byte.

GBR

OUTPUT

Good Block Received - Pulses low for 500ns when a block of

data has been received by the ASIC and has passed all the

validity and error checks.

NBGT

OUTPUT

New Bus Grant - Pulses low whenever a new command is

accepted by the ASIC.

MEREQ

INPUT

Message Error Request - Positive-going edge will cause

Message Error Bit in Status Word to be set.

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