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CLRC663 Datasheet(PDF) 34 Page - NXP Semiconductors |
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CLRC663 Datasheet(HTML) 34 Page - NXP Semiconductors |
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34 / 177 page  NXP Semiconductors CLRC663 High performance multi-protocol NFC frontend CLRC663 and CLRC663 plus 8.4.6.5 Test Data Output (TDO) The TDO pin provides an output stream of serial information from the IR chain or the DR chains. The value of TDO depends on the current TAP state, the current instruction, and the data in the chain being accessed. In order to save power when the port is not being used, the TDO pin is placed in an inactive drive state when not actively shifting out data. Because TDO can be connected to the TDI of another controller in a daisy-chain configuration, the IEEE Standard 1149.1 expects the value on TDO to change on the falling edge of TCK. 8.4.6.6 Data register According to the IEEE1149.1 standard, there are two types of data register defined: bypass and boundary scan The bypass register enable the possibility to bypass a device when part of the scan path.Serial data is allowed to be transferred through a device from the TDI pin to the TDO pin without affecting the operation of the device. The boundary scan register is the scan-chain of the boundary cells. The size of this register is dependent on the command. 8.4.6.7 Boundary scan cell The boundary scan cell opens the possibility to control a hardware pin independent of its normal use case. Basically the cell can only do one of the following: control, output and input. 001aam306 TAP TAP IC1 IC2 TCK TMS TCK TMS TDO TDO Boundary scan cell TDI TDI Figure 24. Boundary scan cell path structure 8.4.6.8 Boundary scan path This chapter shows the boundary scan path of the CLRC663. Number (decimal) Cell Port Function 23 BC_1 - Control 22 BC_8 CLKOUT Bidir 21 BC_1 - Control 20 BC_8 SCL2 Bidir 19 BC_1 - Control 18 BC_8 SDA2 Bidir 17 BC_1 - Control 16 BC_8 IFSEL0 Bidir 15 BC_1 - Control Table 29. Boundary scan path of the CLRC663 CLRC663 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved. Product data sheet Rev. 5.3 — 3 January 2024 34 / 177 |
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