TJA1080ATSSLASH2SLASHT datasheet(17/49 Pages) NXP

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TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

17 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

6.3.1 Star-idle mode

This mode is entered if one of the following events occurs:

• From Star-receive mode and Star-transmit mode if idle is detected on the bus lines, on

pin TXEN and on pins TRXD0 and TRXD1.

• If the transceiver is in Star-locked mode and idle is detected on the bus lines and pin

TXEN for longer than tto(locked-idle).

• If the transceiver is in Star-standby mode and the wake flag is set or no undervoltage

is present.

• If the transceiver is in Star-sleep mode and the wake flag is set, the transceiver enters

Star-idle mode in order to obtain a stable starting point (no glitches on the bus lines

etc.).

In Star-idle mode the transceiver monitors pins TXEN, TRXD0 and TRXD1 and the bus

lines for activity. In this mode the transmitter is disabled.

TRXDOUT is a virtual signal that indicates the state of the TRXD lines. TRXDOUT HIGH means TRXD lines switched as

output. TRXDOUT LOW means TRXD lines switched as input.

Fig 7.

Timing diagram in star configuration

001aae440

TXEN

TXD

RXD

TRXD1

TRXD0

star transmit

star idle

star receive

star transmit

RXEN

TRXDOUT

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