DS33Z41 Quad IMUX Ethernet Mapper

12 JTAG INFORMATION

The device supports the standard instruction codes SAMPLE:PRELOAD, BYPASS, and EXTEST. Optional public instructions included are HIGHZ, CLAMP, and IDCODE. The device contains the following as required by IEEE 1149.1 Standard Test Access Port and Boundary Scan Architecture.

Test Access Port (TAP)

Bypass Register

TAP Controller

Boundary Scan Register

Instruction Register

Device Identification Register

The Test Access Port has the necessary interface pinsL: JTRST, JTCLK, JTMS, JTDI, and JTDO. See the pin descriptions for details. Refer to IEEE 1149.1-1990, IEEE 1149.1a-1993, and IEEE 1149.1b-1994 for details about the Boundary Scan Architecture and the Test Access Port.

Figure 12-1. JTAG Functional Block Diagram

Boundary Scan Register

Identification

Register

Bypass

Register

Instruction

Register

Test Access Port Controller

Mux

Select

Tri-State

10K

10K

10K

JTDI

JTMS

JTCLK

JTRST

JTDO

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Maxim DS33Z41 specifications Jtag Information, Jtag Functional Block Diagram