ACT7005 datasheet(25/29 Pages) AEROFLEX

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Aeroflex Circuit Technology

SCD7005 REV B 8/2/01

Plainview NY (516) 694-6700

Signal Name

Function

A0 - A3

INPUT ADDRESS

A0 = LSB

A3 = MSB

These four signals provide the address codes that control the operation of

the interface.

DEVICE SELECT

Used in conjunction with the address signals. The

input/output interface data bus will remain tri-stated

and no operation will be executed when this signal

is high, regardless of the state of the address signals.

DS = LOW (0) INTERFACE SELECTED

DS = HIGH (1) INTERFACE NOT SELECTED

DB0-DB15

I/O DATA BUS

Data Bus for all SUBSYSTEM READ and WRITE OPERATIONS.

When used in 8 BIT MODE the data bus must be connected as follows:

16/8

PROGRAMS INTERFACE FOR 8 BIT OR 16 BIT DATA BUSES

16/8 = LOW (0)

8 BIT MODE

16/8 = HIGH (1)

16 BIT MODE

MASTER RESET

SYSTEM RESET

When low resets all registers and INPUT/OUTPUT buffers. Minimum Low

Time for reset = 0.5 µsec.

WRITE STROBE

Must GO LOW together with DS to perform a WRITE OPERATION.

NOTE: RD MUST BE HIGH.

READ STROBE

Must GO LOW together with DS to perform a READ OPERATION.

NOTE: WT STROBE MUST BE HIGH.

INTERRUPTS

Refer to DISCRETE INTERRUPT TABLE.

Table 13 – Subsystems Interface Signals

16 BIT MODE

8 BIT MODE

DB0 = LSB

DB0/DB8 = LSB

DB15 = MSB

DB7/DB15 = MSB

DB0 TO DB8

DB4 TO DB12

DB1 TO DB9

DB5 TO DB13

DB2 TO DB10

DB6 TO DB14

DB3 TO DB11

DB7 TO DB15

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