SCANSTA111

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SNLS060K – AUGUST 2001 – REVISED APRIL 2013

Figure 11. Local Scan Port Synchronization on Second Pass

Figure 12. Synchronization of the Three Local Scan Ports

This moves the local chain TAP Controllers to the synchronization state (Run-Test/Idle), where they stay until

the 'STA111 TAP Controller entered the Run-Test/Idle state, as shown in Figure 11.

Each local port has its own Local Scan Port Controller. This is necessary because the LSPN can be configured

in any one of eight (8) possible combinations. Either one, some, or all of the local ports can be accessed

instruction.

The LSPN can be unparked in one of seven different configurations (Si device), as specified by bits 0-2 of Mode

TAP Controllers of an individual local port, but also of synchronizing the individual local ports to one another.

When multiple local ports are selected for access, it is possible that two ports are parked in different states. This

could occur when previous operations accessed the two ports separately and parked them in the two different

states. The LSP Controllers handle this situation gracefully. Figure 12 shows the UNPARK instruction being used

state until the 'STA111 TAP Controller is sequenced through the Pause-DR state. At that point, all three local

ports are synchronized for access via the active scan chain.

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