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

ID 683213
Date 7/24/2020
Document Table of Contents

10.4. Enabling and Disabling IEEE Std. 1149.1 BST Circuitry

The IEEE Std. 1149.1 BST circuitry is enabled after the Arria® V device powers up. However for Arria® V SoC FPGAs, you must power up both HPS and FPGA to perform BST.

The HPS should be held in reset while performing BST to stop the I/Os being accessed or setup by the HPS.

To ensure that you do not inadvertently enable the IEEE Std. 1149.1 circuitry when it is not required, disable the circuitry permanently with pin connections as listed in the following table.

Table 118.  Pin Connections to Permanently Disable the IEEE Std. 1149.1 Circuitry for Arria V Devices
JTAG Pins40 Connection for Disabling
TMS VCCPD supply of Bank 3A
TDI VCCPD supply of Bank 3A
TDO Leave open
40 The JTAG pins are dedicated. Software option is not available to disable JTAG in Arria® V devices.

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