ARM ARM7TDMI Technical Reference Manual page 275

C.2.7 Change to pin positioning
C.2.8 Increased number of metal layers
C.2.9 Increased power consumption
ARM DDI 0210C
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The following pins are now no longer included in scan chain 0:
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Scan chains 1, 2, 3, 4, and 8
Scan chains 1, 2, and 3 are unchanged.
Scan chains 4 and 8 are reserved for internal use by ARM Limited.
Pin order remains the same, with only one new pin appearing at the upper left corner of
the device (see Enhancement to ETM interface on page C-4).
The ARM7TDMI Rev 4 requires four metal layers, compared to three for the
ARM7TDMI Rev 3a.
It is estimated that the ARM7TDMI Rev 4 will consume 10% less power than the
ARM7TDMI Rev 3a on the same process.
Copyright © 2001, 2004 ARM Limited. All rights reserved.
RANGEOUT1
RANGEOUT0
EXTERN1
EXTERN0
BUSEN
DBGEN
INSTRVALID.
IFEN
CGENDBGACK
DCTL
Differences Between Rev 3a and Rev 4
C-5