CT1995 datasheet(7/25 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCDCT1995 REV A 11/21/01 Plainview NY (516) 694-6700

Pin Description

Signal

Hybrid

Sink or Source

Signal Description

RX DATA 0/1

SINK

Positive Date In. This should be a TTL description of the positive, half of the

Manchester code data on the bus. It should be driven to a logic level “1” when

a predetermined positive threshold is exceeded on the bus.

RX DATA 0/1

SINK

Negative Data In. This should be a TTL description of the negative half of the

Manchester code data on the bus. It should be driven to a logic level “1” when

a predetermined negative threshold is exceeded on the bus.

TX INHIBIT 0/1

SOURCE

Transmitter Enable. Goes low when the transmitter is transmitting. Should be

used to enable the bus drivers.

TX DATA

SOURCE

Positive Data Out - When this signal goes high the bus should be driven

positive.

TX DATA

SOURCE

Negative Data Out - When this signal goes high the bus should be driven

negative.

RTAD 0-4

SINK

RT address lines - These should be hardwired by the user. RTAD4 is the most

significant bit.

RTADPAR

SINK

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

BCSTEN 0/1

SINK

Recognition of Broadcast command enable - When low the recognition of

broadcast command is prevented on the specified bus.

6MCK

SINK

6 Megahertz master clock.

IH 08

IH 19

IH 210

IH 311

IH 412

IH 513

IH614

IH715

SINK/SOURCE

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

SOURCE

Data Transfer Request - Goes low to request a data transfer between the

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

DTAK

SINK

Data Transfer Acknowledge - Goes low to indicate that the subsystem is

ready for the data transfer.

IUSTB

SOURCE

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

bytes of data

H/L

SOURCE

High/Low - Indicates which byte of data is on the internal highway. Logic level

"0" for least significant byte.

GBR

SOURCE

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

SOURCE

New Bus Grant - Pulses low whenever a new command is accepted by the

ASIC.

TX/RX

SOURCE

Transmit/Receive - The state of this line informs the subsystem whether it is

to transmit or receive data The signal is valid while INCMD is low.

INCMD

SOURCE

In Command - Goes low when the RT is servicing a valid command. The

subaddress and word count lines are valid while the signal is low.

WC 0-4

SOURCE

Word Count - These five lines specify the requested number of data words to

be received or transmitted. Valid when INCMD is low.

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