MSM7503GS-BK Просмотр технического описания (PDF) - Oki Electric Industry

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MSM7503GS-BK

Multi-Function PCM CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7503

PO0, PO1, PO2, PO3, PO4, PO5, PO6, PO7

Scanning outputs.

These output pins need external pull-up resistors because of their open- drain circuits. But, when

these are used in combination with PI0 to PI7, pull-up resistors are not required. Through

processor control, these outputs can be set open or to digital "0". Initially, these outputs are set

at an opened state.

PI0, PI1, PI2, PI3, PI4, PI5, PI6, PI7

Scanning inputs. In the READ mode, data on PI0 to PI7 can be read out of the processor via data

bus (DB0 to DB7).

Since these inputs are pulled up inside the IC, external resistors are not required.

DB0, DB1, DB2, DB3, DB4, DB5, DB6, DB7

Data bus I/O pins.

These pins are configured as an output during the READ mode only and as an input during other

modes.

T1N, T2N

Line transmit signal output.

Signals which consist of a total of 13 bits configured by the start bit (fixed at "1"), the K bit (fixed

at "1"), the D bits (control data of two bits), the transmit B bits (eight for voice and data) and the

DC bit (1 bit for the DC balance) at the bit rate of 256 kHz are output in burst mode from the T1N

pin and the T2N pin in turn at intervals of 125 msec. These output signals become the AMI code

with a duty of 50% in the line coding configuration by connecting to the line via a transformer

etc. In the output timing of the T1N and T2N pins, the top bit of the signal is output after receiving

a 16-bit signal.

R1N, R2N

Line receive signal input.

Line signals (50% duty AMI code) which consist of a total of 16 bits configured by the frame

synchronous bits (four bits with "1"), the K bit (one bit for polling), the D bits (control data of two

bits), the receive B bits (eight bits for voice and data), and the DC bit (bit for DC balance) have

been transmitted in burst mode at the bit rate of 256 kHz at interval of 125 msec. These signals

should be input in the R1N pin and the R2N pin after separating then into the polarity of "+" and

"–".

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