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Debug Support
5-24
Scan chain 2
Purpose
Allows access to the EmbeddedICE macrocell registers. The order
of the scan chain from TDI to TDO is
read/write
register address bits 4 to 0,
data values bits 31 to 0.
Length
38 bits.
To access this serial register, scan chain 2 must first be selected via the SCAN_N TAP
controller instruction. The TAP controller must then be placed in INTEST mode.
No action is taken during CAPTURE-DR.
During SHIFT-DR, a data value is shifted into the serial register. Bits 32 to 36 specify
the address of the EmbeddedICE macrocell register to be accessed.
During UPDATE-DR, this register is either read or written depending on the value of
bit 37 (0 = read).
Copyright © 1998, 1999 ARM Limited. All rights reserved.
ARM DDI0145B
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