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TJA1080

FlexRay transceiver

Philips Electronics 

Philips Semiconductors

TJA1080

FlexRay transceiver

7. Functional description

The block diagram of the total transceiver is illustrated in Figure 1.

7.1 Operating configurations

7.1.1 Node configuration

In node configuration the transceiver operates as a stand-alone transceiver.

The transceiver can be configured as node by connecting pins TRXD0 and TRXD1 to

ground during a power-on situation (PWON flag is set). The configuration will be latched

when the PWON flag is reset.

The following operating modes are selectable:

• Normal: normal power mode

• Receive: normal power mode

• Standby: low power mode

• Go-to-sleep: low power mode

• Sleep: low power mode

7.1.2 Star configuration

In star configuration the transceiver operates as a branch of a FlexRay active star.

The transceiver can be configured as star by connecting pin TRXD0 or TRXD1 to VBUF

during a PWON situation (PWON flag is set). The configuration will be latched when the

PWON flag is reset.

It is possible to redirect data from one branch to other branches via the inner bus. It is also

possible to send data to all branches via pin TXD, if pins TXEN and BGE have the correct

polarity.

The following operating modes are available:

• Star idle: normal power mode

• Star transmit: normal power mode

• Star receive: normal power mode

• Star sleep: low power mode

• Star standby: low power mode

• Star locked: normal power mode

In the star configuration all modes are autonomously controlled by the transceiver, except

in the case of a wake-up.

TJA1080_1

Preliminary data sheet

Rev. 01 — 20 July 2006

© Koninklijke Philips Electronics N.V. 2006. All rights reserved.

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