Altera Embedded Peripherals IP - Manual (Page 264)

Mailbox Core
27
2014.24.07
UG-01085 Subscribe
Send Feedback
Multiprocessor environments can use the mailbox core with Avalon ® interface to send messages between
processors.
The mailbox core contains mutexes to ensure that only one processor modifies the mailbox contents at a
time. The mailbox core must be used in conjunction with a separate shared memory that is used for
storing the actual messages.
The mailbox core is designed for use in Avalon-based processor systems, such as a Nios
® II processor
system. Altera provides device drivers for the Nios II processor.
Core Overview
Multiprocessor environments can use the mailbox core with Avalon ® interface to send messages between
processors.
The mailbox core contains mutexes to ensure that only one processor modifies the mailbox contents at a
time. The mailbox core must be used in conjunction with a separate shared memory that is used for
storing the actual messages.
The mailbox core is designed for use in Avalon-based processor systems, such as a Nios
® II processor
system. Altera provides device drivers for the Nios II processor.
Functional Description
The mailbox core has a simple Avalon Memory-Mapped (Avalon-MM) slave interface that provides
access to four memory-mapped, 32-bit registers.
Table 27-1: Mutex Core Register Map
Offset Register Name R/W
Bit Description
31 16 15 1 0
0
mutex0
RW
OWNER VALUE
1
reset0
RW Reserved
RESET
2
mutex1
RW
OWNER VALUE
3
reset1
RW Reserved
RESET
© 2014 Altera Corporation. All rights reserved. ALTERA, ARRIA, CYCLONE, ENPIRION, MAX, MEGACORE, NIOS, QUARTUS and STRATIX words and logos are
trademarks of Altera Corporation and registered in the U.S. Patent and Trademark Office and in other countries. All other words and logos identified as
trademarks or service marks are the property of their respective holders as described at www.altera.com/common/legal.html . Altera warrants performance
of its semiconductor products to current specifications in accordance with Altera's standard warranty, but reserves the right to make changes to any
products and services at any time without notice. Altera assumes no responsibility or liability arising out of the application or use of any information,
product, or service described herein except as expressly agreed to in writing by Altera. Altera customers are advised to obtain the latest version of device
specifications before relying on any published information and before placing orders for products or services.
ISO
9001:2008
Registered
www.altera.com
101 Innovation Drive, San Jose, CA 95134