ARM Cortex A9 User Manual

Signal Descriptions
ARM DDI 0388I Copyright © 2008-2012 ARM. All rights reserved. A-6
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A.5 WFE and WFI standby signals
Table A-6 shows the WFE and WFI standby signals.
See Standby modes on page 2-11.
Table A-6 WFE and WFI standby signals
Name I/O
Source or
destination
Description
EVENTI I External
coherent
agent
Event input for Cortex-A9 processor wake-up from WFE mode.
EVENTO O Event output. This signal is active-HIGH for one processor clock cycle when an SEV
instruction is executed.
STANDBYWFE O Power
controller
Indicates if the processor is in WFE mode:
0 Processor not in WFE standby mode.
1 Processor in WFE standby mode.
STANDBYWFI O Indicates if the processor is in WFI mode:
0 Processor not in WFI standby mode.
1 Processor in WFI standby mode.

ARM Cortex A9 Specifications

General

Architecture	ARMv7-A
Cores	1-4
SIMD Extensions	NEON
ISA	ARM
Microarchitecture	Cortex-A9
Instruction Width	32-bit
Data Width	32-bit
MMU	Yes
Instruction Set	ARMv7-A
Clock Speed	Up to 2 GHz
L1 Cache	32 KB Instruction, 32 KB Data (per core)
Process Technology	40 nm, 28 nm
Floating Point Unit	VFPv3
Pipeline Depth	8 stages
Power Consumption	Low power design