Digital Electronics - Programmable Logic Device - Discussion
Discussion Forum : Programmable Logic Device - True or False (Q.No. 1)
1.
The JTAG signals are named TDI, TDO, TMS, and TCK.
Discussion:
1 comments Page 1 of 1.
KIRAN V said:
5 years ago
A JTAG interface is a special interface added to a chip. Depending on the version of JTAG, two, four, or five pins are added.
The four and five-pin interfaces are designed so that multiple chips on board can have their JTAG lines daisy-chained together if specific conditions are met.
The two-pin interface is designed so that multiple chips can be connected in a star topology. In either case, a test probe need only connect to a single "JTAG port" to have access to all chips on a circuit board.
The connector pins are:
1. TDI (Test Data In)
2. TDO (Test Data Out)
3. TCK (Test Clock)
4. TMS (Test Mode Select)
5. TRST (Test Reset) optional.
The four and five-pin interfaces are designed so that multiple chips on board can have their JTAG lines daisy-chained together if specific conditions are met.
The two-pin interface is designed so that multiple chips can be connected in a star topology. In either case, a test probe need only connect to a single "JTAG port" to have access to all chips on a circuit board.
The connector pins are:
1. TDI (Test Data In)
2. TDO (Test Data Out)
3. TCK (Test Clock)
4. TMS (Test Mode Select)
5. TRST (Test Reset) optional.
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