Debug in Depth
ARM DDI 0210C Copyright © 2001, 2004 ARM Limited. All rights reserved. B-9
B.5 Public instructions
Table B-1 lists the public instructions.
In the following instruction descriptions, TDI and TMS are sampled on the rising edge
of TCK and all output transitions on TDO occur as a result of the falling edge of TCK.
The following sections describe:
• EXTEST (b0000)
• SCAN_N (b0010) on page B-10
• SAMPLE/PRELOAD (b0011) on page B-10
• RESTART (b0100) on page B-10
• CLAMP (b0101) on page B-11
• HIGHZ (b0111) on page B-11
• CLAMPZ (b1001) on page B-11
• INTEST (b1100) on page B-12
• IDCODE (b1110) on page B-12
• BYPASS (b1111) on page B-12.
B.5.1 EXTEST (b0000)
The selected scan chain is placed in test mode by the EXTEST instruction.
Table B-1 Public instructions
Instruction Binary Hexadecimal
EXTEST b0000 0x0
SCAN_N b0010 0x2
SAMPLE/PRELOAD b0011 0x3
RESTART b0100 0x4
CLAMP b0101 0x5
HIGHZ b0111 0x7
CLAMPZ b1001 0x9
INTEST b1100 0xC
IDCODE b1110 0xE
BYPASS b1111 0xF
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