SCANPSC110FSC 데이터 시트보기 (PDF) - Fairchild Semiconductor

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SCANPSC110FSC

SCAN Bridge Hierarchical and Multidrop Addressable JTAG Port (IEEE1149.1 System Test Support)

Fairchild Semiconductor 

Overview of SCANPSC110F Bridge Functions (Continued)

FIGURE 2. SCANPSC110F Bridge State Machines

The SCANPSC110F 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

SCANPSC110Fs scan ports in conformance with the

1149.1 Standard (see Figure 17 of appendix). The second

is the SCANPSC110F-selection state-machine (Figure 3).

The third state-machine actually consists of three identical

but independent state-machines (see Figure 4), one per

SCANPSC110F local scan port. Each of these scan port-

selection state-machines allows individual local ports to be

inserted into and removed from the SCANPSC110Fs over-

all scan chain.

The SCANPSC110F selection state-machine performs the

address matching which gives the SCANPSC110F its

multi-drop capability. That logic supports single-

SCANPSC110F access, multi-cast, and broadcast. The

SCANPSC110F-selection state-machine implements the

chip’s Level-1 protocol.

KEY

+ = OR

& = AND

ADDR = 6-bit address in the Instruction Register

SLOT = Static address in the SCANPSC110F Selection Controller

FIGURE 3. State Machine for SCANPSC110F Bridge Selection Controller

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