JTAGulator: Assisted discovery of on-chip ... - Grand Idea Studio
JTAGulator: Assisted discovery of on-chip ... - Grand Idea Studio
JTAGulator: Assisted discovery of on-chip ... - Grand Idea Studio
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JTAG: Architecture• Synchr<strong>on</strong>ous serial interface→ TDI = Data In (to target device)← TDO = Data Out (from target device)→ TMS = Test Mode Select→ TCK = Test Clock→ /TRST = Test Reset (opti<strong>on</strong>al for async reset)• Test Access Port (TAP) w/ Shift Registers- Instructi<strong>on</strong> (>= 2 bit wide)- Data- Bypass (1 bit)- Boundary Scan (variable)- Device ID (32 bit) (opti<strong>on</strong>al)