TMPR4955AF datasheet(138/168 Pages) TOSHIBA

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TMPR4955AF 데이터시트(PDF) 138 Page - Toshiba Semiconductor

부품명	TMPR4955AF

상세설명	64-Bit TX System RISC TX49 Family

PDF	168 Pages

Scroll/Zoom	100%

제조업체	TOSHIBA [Toshiba Semiconductor]

홈페이지	http://www.semicon.toshiba.co.jp/eng

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138 / 168 page

Chapter 7 JTAG Interface

7-4

7.3.2

Bypass Register

The

Bypass register is 1 bit wide. When the TAP controller is in the Shift-DR (Bypass)

state, the data on the JTDI pin is shifted into the

Bypass register, and the Bypass register

output shifts to the JTDO output pin.

In essence, the

Bypass register is a short-circuit which allows bypassing of board-level

devices, in the serial boundary-scan chain, which are not required for a specific test. The

logical location of the

Bypass register in the boundary-scan chain is shown in Figure 7.3.3.

Use of the

Bypass register speeds up access to boundary-scan registers in those ICs that

remain active in the board-level test datapath.

Figure 7.3.3 Bypass Register Operation

JTDO

Board

input

IC package

Board

JTDI

Bypass

Boundary-scan register pad cell

Board

output

JTDI

JTDO

JTDI

JTDO

JTDI

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