发明名称 |
Scan test port capture/shift signals maintaining/transitioning sequence and idle states |
摘要 |
Operating a state machine includes enabling operation of the state machine upon receiving a signal indicating a change from operation of a test access port to a scan test port. The process maintains the state machine in an IDLE 1 state while receiving a scan test port capture signal and transitions the state machine to an IDLE 2 state when receiving a scan test port shift signal. The process then transitions the state machine to a SEQUENCE 1 state, then to a SEQUENCE 2 state, and then to a SEQUENCE 3 state when receiving sequential scan test port capture signals. The state machine then transitions to an UNLOCK TAP state and then back to the IDLE 1 state when receiving sequential scan test port shift signals on the test mode select/capture select lead. |
申请公布号 |
US9052362(B2) |
申请公布日期 |
2015.06.09 |
申请号 |
US201414190330 |
申请日期 |
2014.02.26 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
Whetsel Lee D. |
分类号 |
G01R31/3177;G01R31/3185 |
主分类号 |
G01R31/3177 |
代理机构 |
|
代理人 |
Bassuk Lawrence J.;Cimino Frank D. |
主权项 |
1. A process of operating a state machine comprising:
A. enabling operation of the state machine upon receiving an enabling signal indicating a change from operation of a test access port to a scan test port; B. maintaining an IDLE 1 state while receiving scan test port capture signals on a test mode select/capture select lead; C. transitioning from the IDLE 1 state to an IDLE 2 state when receiving a scan test port shift signal on the test mode select/capture select lead; D. maintaining the IDLE 2 state when receiving a scan test port capture signal on the test mode select/capture select lead; E. transitioning from the IDLE 2 state to a SEQUENCE 1 state when receiving a scan test port capture signal on the test mode select/capture select lead; and F. transitioning from the SEQUENCE 1 state to the IDLE 2 state when receiving a scan test port shift signal on the test mode select/capture select lead. |
地址 |
Dallas TX US |