C167CS datasheet(293/517 Pages) INFINEON

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C167CS

Derivatives

The High-Speed Synchronous Serial Interface

User’s Manual

12-10

V2.0, 2000-07

12.2

Half-Duplex Operation

In a half duplex configuration only one data line is necessary for both receiving and

transmitting of data. The data exchange line is connected to both pins MTSR and MRST

of each device, the clock line is connected to the SCLK pin.

The master device controls the data transfer by generating the shift clock, while the slave

devices receive it. Due to the fact that all transmit and receive pins are connected to the

one data exchange line, serial data may be moved between arbitrary stations.

Similar to full duplex mode there are two ways to avoid collisions on the data

exchange line:

• only the transmitting device may enable its transmit pin driver

• the non-transmitting devices use open drain output and only send ones

Since the data inputs and outputs are connected together, a transmitting device will

clock in its own data at the input pin (MRST for a master device, MTSR for a slave). By

these means any corruptions on the common data exchange line are detected, where

the received data is not equal to the transmitted data.

Figure 12-5

SSC Half-Duplex Configuration

MCS01965

Common

Transmit/

Receive

Line

MRST

SCLK

Device #2

Slave

Clock

Shift Register

MTSR

Clock

Master

Device #1

Clock

MTSR

MRST

SCLK

Shift Register

Clock

Slave

Device #3

SCLK

MTSR

MRST

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