Key To Timing Diagram Conventions - ARM ARM926EJ-S Technical Reference Manual

ARM DDI0198D
Signal naming
The level of an asserted signal depends on whether the signal is active-HIGH or
active-LOW. Asserted means HIGH for active-HIGH signals and LOW for active-LOW
signals:
Prefix H Denotes Advanced High-performance Bus (AHB) signals.
Prefix n Denotes active-LOW signals except in the case of AHB or Advanced
Peripheral Bus APB reset signals. These are named HRESETn and
PRESETn respectively.
Prefix DH Denotes data side AHB signals.
Prefix IH Denotes instruction side AHB signals.
Prefix DR Denotes data side TCM interface signals.
Prefix IR Denotes instruction side TCM interface signals.
Prefix ETM Denotes ETM interface signals.
Prefix DBG Denotes debug/JTAG signals.
Prefix CP Denotes coprocessor interface signals.
Copyright © 2001-2003 ARM Limited. All rights reserved.
Clock
HIGH to LOW
Transient
HIGH/LOW to HIGH
Bus stable
Bus to high impedance
Bus change
High impedance to stable bus

Key to timing diagram conventions

Preface
xix