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SCANSTA111 Datasheet(PDF) 7 Page - Texas Instruments |
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SCANSTA111 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 38 page SCANSTA111 www.ti.com SNLS060K – AUGUST 2001 – REVISED APRIL 2013 Figure 4. Local SCANSTA111 Port Configuration State Machine The 'STA111's scan port-configuration state-machine is used to control the insertion of local scan ports into the overall scan chain, or the isolation of local ports from the chain. From the perspective of a system's (single) scan controller, each 'STA111 presents only one scan chain to the master. The 'STA111 architecture allows one or more of the 'STA111's local ports to be included in the active scan chain. Each local port can be parked in one of four stable states (Parked-TLR, Parked-RTI, Parked-Pause-DR or Parked-Pause-IR), either individually or simultaneously with other local ports. Parking a chain removes that local chain from the active scan chain. Conversely, a parked chain can be unparked, causing the corresponding local port to be inserted into the active scan chain. As shown in Figure 4, the 'STA111's three scan port-configuration state-machines allow each of the part's local ports to occupy a different state at any given time. For example, some ports may be parked, perhaps in different states, while other ports participate in scan operations. The state-diagram shows that some state transitions depend on the current state of the TAP-control state-machine. As an example, a local port which is presently in the Parked-RTI state does not become unparked (i.e., enter the Unparked state) until the 'STA111 receives an UNPARK instruction and the 'STA111's TAP state-machine enters the Run-Test/Idle state. Similarly, certain transitions of the scan port-configuration state-machine can force the 'STA111's LSP-control state-machine into specific states. For example, when a local port is in the Unparked state, the 'STA111 receives the PARKRTI instruction and the TAP is transitioned through Run-Test/Idle state, the Local Port controller enters the Parked-RTI state in which TMSn will be held low until the port is later unparked. Once the Park-RTI instruction has been updated into the instruction register the TAP MUST be transitioned through the Run- Test/Idle state. While TMSn is held low, all devices on that local scan chain remain in their current TAP State (the RTI TAP controller state in this example). The 'STA111's scan port-configuration state-machine implements part of the 'STA111's Level-2 protocol. In addition, the 'STA111 provides a number of Level-2 instructions for functions other than local scan port configuration. These instructions provide access to and control of various registers within the 'STA111. This set of instructions includes: BYPASS CNTRSEL EXTEST LFSRON SAMPLE/PRELOAD LFSROFF IDCODE CNTRON MODESEL CNTROFF MCGRSEL GOTOWAIT LFSRSEL Copyright © 2001–2013, Texas Instruments Incorporated Submit Documentation Feedback 7 Product Folder Links: SCANSTA111 |
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