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TJA1086 Datasheet(PDF) 7 Page - NXP Semiconductors |
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TJA1086 Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 62 page  TJA1086 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 1 — 18 April 2013 7 of 62 NXP Semiconductors TJA1086 FlexRay active star coupler 6.4 Wake-up The TJA1086 supports the following wake-up mechanisms: • Remote wake-up via the bus (wake-up pattern or dedicated wake-up frame) • Local wake-up via pin LWU • Activity on the inner star interface (pins TRXD0 and TRXD1) Any wake-up event will generate a WU interrupt. A remote wake-up on a branch will generate an EVENT_BRx interrupt to indicate the branch where the wake-up pattern or dedicated data frame was detected. The host can identify the wake-up source by polling the General Status register (WU_TRXD = 1 for a TRXD0/1 wake-up; WU_LOCAL = 1 for a local wake-up) and the Branch Status register (WU_BRx = 1 for a remote wake-up). 6.4.1 Remote wake-up When the TJA1086 is in AS_Standby or AS_Sleep, both branches are monitored for wake-up events. When a valid wake-up pattern or data frame is detected on one of the branches, the relevant WU_BRx status bit is set and the wake-up pattern/data frame is forwarded to the other branch (if enabled). A remote wake-up event occurring during an AS_Normal-to-AS_Standby or AS_Normal-to-AS_Sleep transition will also be detected, setting the relevant WU_BRx status bit and generating WU and EVENT_BRx interrupts. 6.4.1.1 Bus wake-up via wake-up pattern A wake-up pattern consists of at least two consecutive wake-up symbols. A wake-up symbol consists of a DATA_0 phase lasting longer than tdet(wake)DATA_0, followed by an idle phase lasting longer than tdet(wake)idle, provided both wake-up symbols occur within a time span of tdet(wake)tot (see Figure 3). The transceiver also wakes up if the idle phases are replaced by DATA_1 phases. A wake-up event is not detected if an invalid wake-up pattern is received. See Ref. 1 for more details on invalid wake-up patterns. |
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