PSB7280 Просмотр технического описания (PDF) - Siemens AG

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PSB7280

Joint Audio Decoder-Encoder

Siemens AG 

PSB 7280

1.5

Pin Description

Table 1

Parallel Host Interface

Pin No. Symbol Function Descriptions

16

AD0 I/O

15

AD1 I/O

14

AD2 I/O

13

AD3 I/O

Multiplexed Bus Mode: Address/Data Bus. Transfers

addresses from the host to JADE and data between the

host and the JADE

Demultiplexed Bus Mode: Data bus. Transfers data

between the host and the JADE

9

AD4 I/O

8

AD5 I/O

7

AD6 I/O

6

AD7 I/O

4

DS

I

Data Strobe.

The rising edge marks the end of a valid read or write

operation (Motorola bus mode).

RD

I

Read.

This signal indicates a read operation (Siemens/Intel

bus mode).

5

R/W I

Read/Write.

A 1 (“high“) identifies a valid host access as a read

operation. A 0 identifies a valid host access as a write

operation (Motorola bus mode)

WR

I

Write.

This signal indicates a write operation (Siemens/Intel

bus mode).

3

CS

I

Chip Select.

2

ALE I

Address Latch Enable.

A “high” on this line indicates an address on AD(0:7)

(multipexed bus mode only). ALE also selects the

interface mode

82

A0

I

Address Bits A(0:3) (demultiplexed bus type)

83

A1

I

19

A2

I

96

A3

I

Semiconductor Group

11

Data Sheet 1998-07-01

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