Datasheet

SCANSTA111
SNLS060K –AUGUST 2001–REVISED APRIL 2013 www.ti.com
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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