AD14160KB-4 datasheet(13/52 Pages) AD

13 / 52 page

AD14160/AD14160L

–13–

REV. A

SYSTEM

CLKIN

EMU

TDI

TDO

TDI

EMU

TMS

TCK

TDO

TRST

CLKIN

*OPEN DRAIN DRIVER OR EQUIVALENT, i.e.,

TDI

TDO

TDI

TDO

TDI

TDO

TDI

TDO

TDI

TDO

Figure 8. JTAG Clocktree for Multiple ADSP-2106x Systems

Connecting CLKIN to Pin 4 of the EZ-ICE header is optional.

The emulator only uses CLKIN when directed to perform op-

erations such as starting, stopping and single-stepping multiple

ADSP-2106xs in a synchronous manner. If you do not need

these operations to occur synchronously on the multiple proces-

sors, simply tie Pin 4 of the EZ-ICE header to ground.

If synchronous multiprocessor operations are needed and

CLKIN is connected, clock skew between the AD14160/

AD14160L and the CLKIN pin on the EZ-ICE header must be

minimal. If the skew is too large, synchronous operations may

be off by one cycle between processors. For synchronous multi-

processor operation TCK, TMS, CLKIN and

EMU should be

treated as critical signals in terms of skew, and should be laid

out as short as possible on your board. If TCK, TMS and

CLKIN are driving a large number of ADSP-2106xs (more than

eight) in your system, then treat them as a “clock tree” using

multiple drivers to minimize skew. (See Figure 8 JTAG Clock

Tree and Clock Distribution in the “High Frequency Design

Considerations” section of the ADSP-2106x User’s Manual).

If synchronous multiprocessor operations are not needed (i.e.,

CLKIN is not connected), just use appropriate parallel termina-

tion on TCK and TMS. TDI, TDO,

EMU and TRST are not

critical signals in terms of skew.

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