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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SCANPSC110F датащи(PDF) 6 Page - National Semiconductor (TI) |
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SCANPSC110F датащи(HTML) 6 Page - National Semiconductor (TI) |
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6 / 29 page  Overview of SCANPSC110F Bridge Functions (Continued) The ’PSC110F’s scan port-configuration state-machine is used to control the insertion of local scan ports into the over- all scan chain, or the isolation of local ports from the chain. From the perspective of a system’s (single) scan controller, each ’PSC110F presents only one scan chain to the master. The ’PSC110F architecture allows one or more of the ’PSC110F’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 in- serted into the active scan chain. As shown in Figure 4, the ’PSC110F’s three scan port-configuration state-machines allow each of the part’s lo- cal ports to occupy a different state at any given time. For ex- ample, 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 ex- DS100327-5 KEY + = OR & = AND ADDR = 6-bit address in the Instruction Register SLOT = Static address in the ’PSC110F Selection Controller FIGURE 3. State Machine for SCANPSC110F Bridge Selection Controller DS100327-12 FIGURE 4. Local SCANPSC110F Bridge Port Configuration State Machine www.national.com 6 |
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