SCANSTA111

SNLS060K – AUGUST 2001 – REVISED APRIL 2013

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Figure 5 illustrates how the 'STA111's state-machines interact. The 'STA111-selection state-machine enables or

disables operation of the chip's three port-selection state-machines. In 'STA111s which are selected via Level-1

protocol (either as individual 'STA111s or as members of broadcast or multi-cast groups), Level-2 protocol

commands can be used to park or unpark local scan ports. Note that most transitions of the port-configuration

state-machines are gated by particular states of the 'STA111's TAP-control state-machine, as shown in Figure 4

or Figure 5.

Figure 5. Relationship Between SCANSTA111 State Machines

Following a hardware reset, the TAP controller state-machine is in the Test-Logic-Reset (TLR) state; the

'STA111-selection state-machine is in the Wait-For-Address state; and each of the three port-selection state-

machines is in the Parked-TLR state. The 'STA111 is then ready to receive Level-1 protocol, followed by Level-2

protocol.

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