PM0020 datasheet(58/87 Pages) STMICROELECTRONICS

58 / 87 page

Known limitations

PM00020

58/87

Known limitations

Error Status with full chip

erase for a secured device.

9-23-05

Full chip erase on a secured device is an allowable

instruction. For the current revision of silicon, if the device

is secured, full chip erase will return an error status. The

erase operation is still going on as usual. Read/Busy

status is fully working. Hence, for a full chip erase on a

secured device, work around is to ignore error status and

instead, only relies on ready/busy status to determine the

completion of full chip erase operation.

ISC_READ. 9-23-05

During data shift (64 bits), TDI has to be 1 (instead of don't

care).

Address skip during

ISC_READ

Pulsing of TCK during RTI state increments address,

resulting in skipping of addresses during ISC read back.

Workaround: Keep TCK unchanged during RTI.

PAUSE State

If PAUSE state is entered, resuming shift from PAUSE

requires starting of shift from the beginning.

Workaround: Avoid entering of PAUSE state.

Daisy chain setup

Require STR91xFA to be first in the chain.

ISC-PROGRAM failure.

6-29-06

Pulsing of TCK during RTI state causes programming

failure.

Workaround: Keep TCK unchanged during RTI.

PM0020 Datasheet(PDF) 58 Page - STMicroelectronics