PSB7230 Datasheet, PDF(68/179 Page) Siemens Semiconductor Group – Joint Audio Decoder-Encoder for Analog Videophone JADE AN

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PSB7230 Datasheet, PDF (68/179 Pages) Siemens Semiconductor Group – Joint Audio Decoder-Encoder for Analog Videophone JADE AN

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PSB 7230

Functional Blocks

Parameters:

SLIN = 0:

SLIN = 1:

CH(0:3)

CIL:

DLL:

C/I channel transmit data on DU, receive data on DD

C/I channel transmit data on DD, receive data on DU

C/I channel in 4th byte of multiplex 0, â¦, 15, common for receive and

transmit channel (CH(0:3) = 0001 in the example)

C/I channel length is 4 bits (0) or 6 bits (1)

Double last look yes (1) or no (0)

4.4.1 Monitor Channel Protocol

Use of Monitor Channel

In the case where a local host is present, the Monitor channel may be used e.g. for data

exchange between the local host and another controller attached to the IOM-2 bus. For

this purpose the basic Monitor channel protocol as explained in this section is sufficient.

Note: The Monitor channel protocol is not implemented on-chip on the PSB 7230. The

Monitor channel protocol has to be implemented via the host: this allows the

implementation of data exchange with a remotely located controller.

General Description of Monitor Channel Protocol

The Monitor channel consists of 8 bits for the Monitor Data channel (MON) and 2 bits for

the flow control (MX and MR). The transmitter controls the Monitor Data channel and the

MX bit on one line while evaluating the condition of the MR bit on the other line. The

receiver evaluates the MX bit of one line and latches its Monitor Data value. It controls

the MR bit of the other line. The Monitor channel protocol is shown in the figure below.

The hardware performs reception and transmission of Monitor channel messages

(packets) byte by byte under software control.

The received and transmitted Monitor channel bytes are stored in the Monitor Data

Transmit (MONX) register and Monitor Data Receive (MONR) register, respectively.

The software controls the monitor channel via two control bits in the Monitor channel

Control Register:

MRE

MRC

MXC

Monitor channel Receiver Enable

MR bit Control

Monitor channel Transmitter Control.

Semiconductor Group

Data Sheet 1998-07-01

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