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6.1. 使能BST电路
配置器件后,IEEE Std. 1149.1 BST电路使能。如果需要在配置之前执行边界扫描测试,则必须在器件上电后运行MISCCTRL指令以使能BST电路。
MISCCTRL指令
!Shift 10-bit MISCCTRL instruction (0x013) to Instruction Register
SIR 10 TDI (013);
!Transition to Run-Test-Idle state
STATE IDLE;
!Shift 8-bit data (0x01) to Data Register for BST circuitry enabling
SDR 8 TDI (01);