Cyclone V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683375
Date 7/05/2022
Document Table of Contents

9.6. IEEE Std. 1149.1 Boundary-Scan Register

The boundary-scan register is a large serial shift register that uses the TDI pin as an input and the TDO pin as an output. The boundary-scan register consists of 3-bit peripheral elements that are associated with Cyclone® V I/O pins. You can use the boundary-scan register to test external pin connections or to capture internal data.

Figure 178.  Boundary-Scan RegisterThis figure shows how test data is serially shifted around the periphery of the IEEE Std. 1149.1 device.

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