DS2155 datasheet(227/262 Pages) DALLAS

Part #	DS2155

Description	T1/E1/J1 Single-Chip Transceiver TDM/UTOPIA II Interface

PDF	262 Pages

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Manufacturer	DALLAS [Dallas Semiconductor]

Direct Link	https://www.maximintegrated.com/en.html

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DS2156

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Figure 33-2. TAP Controller State Diagram

33.2 Instruction Register

The instruction register contains a shift register as well as a latched parallel output and is 3 bits in length.

When the TAP controller enters the Shift-IR state, the instruction shift register is connected between JTDI

and JTDO. While in the Shift-IR state, a rising edge on JTCLK with JTMS LOW shifts the data one stage

toward the serial output at JTDO. A rising edge on JTCLK in the Exit1-IR state or the Exit2-IR state with

JTMS HIGH moves the controller to the Update-IR state. The falling edge of that same JTCLK latches

the data in the instruction shift register to the instruction parallel output. Instructions supported by the

DS2156 and its respective operational binary codes are shown in Table 16-A.

Select

DR-Scan

Capture DR

Shift DR

Exit DR

Pause DR

Exit2 DR

Update DR

Select

IR-Scan

Capture IR

Shift IR

Exit IR

Pause IR

Exit2 IR

Update IR

Test Logic

Reset

Run Test/

Idle

DS2155 Datasheet(PDF) 227 Page - Dallas Semiconductor