XM014034B datasheet(76/83 Pages) XMOS

76 / 83 page

XU6--QF6A Datasheet

JTAG, xSCOPE and Debugging

If you intend to design a board that can be used with the XMOS toolchain and xTAG

debugger, you will need an xSYS connection on your board. There are three physical

xSYS connections that XMOS uses:

In its smallest form you can put 6 testpoints and three through-holes on the PCB and

use a TAG-connect cable to connect to an XTAG.

You can use a half-sized header (approximately mm wide) that supports just JTAG,

which is cabled to an XTAG.

You can use a full sized header (approximately

mm wide) supports both JTAG and

XSCOPE, again cabled to an XTAG.

Note that the xSYS header has a different form-factor than the xSYS header used on

older devices. This is because the signal levels are different (.8V rather than .V). Only

use .8V XTAG adapters to program this device.

Figure

shows a decision diagram which explains what type of xSYS connectivity you

need. The three subsections below explain the options in detail.

Is debugging

required?

Does the QSPI

ﬂash need to be

programmed?

Is xSCOPE

required?

Is fast printf

required?

YES

Use full xSYS2 header

See section .4

Use JTAG xSYS2 header

See section .3

No xSYS2 header required

See section .1

Use TAG connect header

See section .2

Figure

Decision

diagram for

the xSYS

header

No xSYS connection

The use of an xSYS connection is optional, and may not be required for volume pro-

duction designs. However, the XMOS toolchain expects the xSYS connection; if you do

not have an xSYS connection then you must provide your own method for writing to

ash/OTP and for debugging.

XM014034B Datasheet(PDF) 76 Page - Xmos Ltd.

XM014034B Datasheet(HTML) 76 Page - Xmos Ltd.

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