ARM ARM7TDMI - Summary of Differences Between Rev 3 a and Rev 4

Differences Between Rev 3a and Rev 4
C-2 Copyright © 2001, 2004 ARM Limited. All rights reserved. ARM DDI 0210C
C.1 Summary of differences between Rev 3a and Rev 4
The changes incorporated in ARM7TDMI Rev 4 are as follows:
• improved low voltage operation
• addition of EmbeddedICE-RT logic
• enhancement to ETM interface
• ability to minimize power consumption (by disabling EmbeddedICE-RT)
• improvement in Debug Communications Channel (DCC) bandwidth
• support for access to DCC through JTAG
• alterations to TAP Controller Scan Chain.
These are described in detail in Detailed descriptions of differences between Rev 3a and
Rev 4 on page C-3.