Programming CPLDs Via the 'LVT8986 LASP

This application report summarizes key information required for understanding the 'LVT8986 linking addressable scan ports (LASPs) multidrop addressable IEEE Std 1149.1 (JTAG) test access port (TAP) transceiver. This report includes information about the 'LVT8986 secondary TAPs, bypass and linking shadow protocol, scan-path description languages, serial vector format files, and an example of how to program a PLD via an 'LVT8986. It is expected that the reader is already familiar with JTAG testing, so there is little review of any of the aspects of this device that are defined by the standard. The intent is that, after reading this and either being familiar with the LASP and JTAG or becoming so, the reader should be able to understand what necessary adaptations to a JTAG test would need to be made to include the 'LVT8986.