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Contents
iii
Chapter 1: About the NS7520..................................................1
NS7520 Features ......................................................................... 2
Key features and operating modes of the major NS7520 modules ........ 2
NS7520 module block diagram......................................................... 5
Operating frequency .................................................................... 6
Chapter 2:
Pinout and Packaging ............................................7
Packaging ................................................................................. 8
Pinout detail tables and signal descriptions........................................ 11
System bus interface ............................................................ 12
Chip select controller ........................................................... 16
Ethernet interface MAC......................................................... 18
“No connect” pins ............................................................... 21
General-purpose I/O ............................................................ 21
System clock and reset ......................................................... 24
System mode (test support).................................................... 25
JTAG test (ARM debugger) ..................................................... 26
Power supply ..................................................................... 28
Chapter 3:
Working with the CPU......................................... 29
ARM Thumb concept ................................................................... 30
CPU performance ....................................................................... 30
Working with ARM exceptions ........................................................ 31
Summary of ARM exceptions ................................................... 32
Exception priorities.............................................................. 32