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JTAG-Booster for AMD ÉlanSC520

50 JTAGEL5d.doc

3. Implementation Information

This chapter summarizes some information about the implementation of the

JTAG-Booster and describes some restrictions.

• The JTAG-Booster currently uses the EXTEST function of the JTAG-Interface

to perform Flash programming. The new debug interface of the AMD

ÉlanSC520 is not used.

• The revision A0 and A1 of the AMD ÉlanSC520 have a silicon bug with the

JTAG identification register. As a result of that bug, the contents of the

identification register is shifted out infinitely. If there are other devices in the

JTAG chain, the AMD ÉlanSC520 must be the first part in the chain (nearest

to targets TDI). Otherwise the JTAG-Booster does not work.

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