Achronix Bitporter Uživatelský manuál stáhnout pdf (Strana 32)

Picking a STAPL Action (-a option) Using the Achronix STAPL Player

PAGE 26

www.achronix.com Bitporter User Guide

STAPL Actions, JTAG, Secure Mode, and Encrypted Bitstreams

STAPL actions interact with the select ed device through the JTAG interface. To protect

designs, when an Achronix device is running in Secure Mode, any attempts to read device

data(excepttheIDCODE)throughtheJTAGportwillreturnallzeros.

Whengeneratinga*.jamSTAPLfilewithinACE,theusermaychoose

toencryptthebitstream

using the AES encryption scheme. (See the ACE User Guide (UG001) for more information.)

When the PROGRAM_ENCRYPTED action is run from a file containing an encrypted

bitstream, the device automatically enters Secure Mode, making subsequent JTAG reads

impossible.

The STAPL actions within a STAPL file are able to detect

whether the containing file

encapsulates an encrypted bitstream. Any STAPL action that requires the reading of data

throughtheJTAGinterfacewilleitherlogwarningsfortheuserorexitwitherrorswhenthe

actionisrunfromwithinafilecontaininganencryptedbitstream.

Note: OnceadeviceisinSecureMode,

theonlywaytoexitSecureModeistopowercyclethedevice.

ThismeansthatnoteventheERASEorPROGRAM_ENCRYPTEDactionswillsucceedonceadevice

isinSecureMode.

Procedures

STAPLactionsaremadeupofoneormoreSTAPLprocedurecalls(Table 4‐3andTable 4‐4).

Someoftheseprocedurescan be markedas OPTIONAL or RECOMMENDED,meaningthe

user can choose to include or exclude the specified procedure — RECOMMENDED

procedures are called by default,but may be excluded

by the user; OPTIONAL procedures

are not called by defaultbut maybeincluded bythe user. Refer to EIA/JEDEC Standard 71

(JESD71),StandardTestandProgrammingLanguage(STAPL)forcompletedetails.

Note: STAPLiscaseinsensitive;theprocedurenameslistedinTable 4‐3andTable 4‐4areinall

capitalsforreadability.

Table 4-2: STAPL Actions Generated by ACE

Action Name Description

READ_IDCODE Returns the IEEE 1149.1 IDCODE of the target device.

PROGRAM

Programs the device with an unencrypted bitstream.

(1)

PROGRAM_ENCRYPTED

Programs the device with an encrypted bitstream.

(1)

VERIFY

Verifies the programming of the device.

(1)(2)

ERASE

Performs a bulk erase of the device.

(1)

READ

Reads the programming data of the device.

(1)

Notes:

1. This action is not supported when the connected device is already running in Secure Mode. See the

full action description for details.

2. This action is not supported for encrypted bitstreams. See the full action description for details.

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