TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 6 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
6. Functional description
The block diagram of the total transceiver is illustrated in Figure 1.
6.1 Operating configurations
6.1.1 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, see Section 6.7.4
.
The following operating modes are available:
• Normal (normal power mode)
• Receive-only (normal power mode)
• Standby (low power mode)
• Go-to-sleep (low power mode)
• Sleep (low power mode)
6.1.2 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 V
BUF
during a PWON situation (PWON flag is set). The configuration will be latched when the
PWON flag is reset, see Section 6.7.4 “
Power-on flag”.
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.
