SCANSTA111

SNLS060K – AUGUST 2001 – REVISED APRIL 2013

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Figure 2. SCANSTA111 State Machines

The 'STA111 contains three distinct but coupled state-machines (see Figure 2). The first of these is the TAP-

control state-machine, which is used to drive the 'STA111's scan ports in conformance with the 1149.1 Standard.

The second is the 'STA111-selection state-machine (Figure 3). The third state-machine actually consists of three

identical but independent state-machines (see Figure 4), one per 'STA111 local scan port. Each of these scan

port selection state-machines allows individual local ports to be inserted into and removed from the 'STA111s

overall scan chain.

The 'STA111 selection state-machine performs the address matching which gives the 'STA111 its multi-drop

capability. That logic supports single-'STA111 access, multi-cast, and broadcast. The 'STA111-selection state-

machine implements the chip's Level-1 protocol.

Figure 3. State Machine for SCANSTA111 Selection Controller

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