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The ARM7TDMI-S does not have a boundary scan chain. Consequently support for some JTAG instructions have been removed.
Optional JTAG specification instructions are:
CLAMP
HIGHZ
CLAMPZ.
When scan chain 1 or scan chain 2 is selected, you can not use the EXTEST, SAMPLE, and PRELOAD instructions because:
unpredictable behavior will occur
instructions are only supported for designer added scan chains.
| Copyright © ARM Limited 1998-2000. All rights reserved. | ARM DDI 0084F |
| Non-Confidential | |
| PDF version | |
| Home > Differences Between the ARM7TDMI‑S and the ARM7TDMI > ARM7TDMI‑S design considerations > TAP controller |