Microsemi SmartFusion2 MSS DDR Bridge Installation Guide

: June 9, 2024
: Microsemi

Table of Contents

SmartFusion2 MSS
- DDR Bridge Configuration
Configuration Options
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

SmartFusion2 MSS

DDR Bridge Configuration

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Configuration Options

The DDR bridge is a data bridge between four AHB bus masters and a single AXI bus slave. It accumulates AHB writes into write combining buffers prior to bursting out to external DDR memory. It also includes read combining buffers, enabling AHB masters to efficiently read data from the external DDR memory from a local buffer. The DDR bridge optimizes reads and writes from multiple masters to a single external DDR memory. Data coherency rules between the four masters and the external DDR memory are implemented in the hardware.

The DDR bridge contains three write combining / Read buffers and one read buffer. All buffers within the DDR bridge are implemented with latches and are not subject to the single event upsets (SEU’s) that SRAM exhibits. For complete details please refer to the Microsemi SmartFusion2 User’s Guide.

Configuration Options

Write Buffer Timing Out Counter – This is a 10-bit timer interface used to configure the timeout register in the write buffer module (Figure 1). Once the timer reaches the timeout value, a flush request is generated by the flush controller and if the response has been received for a previous write request from the write arbiter, this request is posted to the write arbiter. This register is common for all buffers.

Figure 1 · Configuring DDR Bridge

Non Bufferable Region Size – Use this option to set the size of non- bufferable address region.

Non Bufferable Region Address – Use this option to set the base address of a non-bufferable address region. Bits [15:(N – 1)] of this signal are compared with AHB address [31:(N + 15)] to check whether address is in non- bufferable region. The value of N depends on the non-bufferable region size, so the base address is defined according to the DDRB_NB_SZ register that holds the non-bufferable region size value defined in this configurator.

Enabling Write Combining Buffer – Use these options to enable the Write Combining Buffers for the DS, HPDMA and AHB Bus (SWITCH) Masters.

Enabling Read Buffer – Use these options to enable the Read Buffers for the DS, HPDMA and AHB Bus (SWITCH) and IDC Masters.

DDR Burst Size For Read/Write Buffers – Use this to configure the write buffer and read buffer size as per DDR burst size. The IDC read buffer has a fixed size of 32 bytes. Other buffers can be configured to 16-byte or 32-byte size.

A - Product Support

Microsemi SoC Products Group backs its products with various support services, including Customer Service, Customer Technical Support Center, a website, electronic mail, and worldwide sales offices. This appendix contains information about contacting Microsemi SoC Products Group and using these support services.

Customer Service

Contact Customer Service for non-technical product support, such as product pricing, product upgrades, update information, order status, and authorization.

From North America, call 800.262.1060
From the rest of the world, call 650.318.4460
Fax, from anywhere in the world, 408.643.6913

Customer Technical Support Center

Microsemi SoC Products Group staffs its Customer Technical Support Center with highly skilled engineers who can help answer your hardware, software, and design questions about Microsemi SoC Products. The Customer Technical Support Center spends a great deal of time creating application notes, answers to common design cycle questions, documentation of known issues, and various FAQs. So, before you contact us, please visit our online resources. It is very likely we have already answered your questions.

Technical Support

Visit the Customer Support website (www.microsemi.com/soc/support/search/default.aspx) for more information and support. Many answers available on the searchable web resource include diagrams, illustrations, and links to other resources on the website.

Website

You can browse a variety of technical and non-technical information on the SoC home page, at www.microsemi.com/soc.

Contacting the Customer Technical Support Center

Highly skilled engineers staff the Technical Support Center. The Technical Support Center can be contacted by email or through the Microsemi SoC Products Group website.

Email

You can communicate your technical questions to our email address and receive answers back by email, fax, or phone. Also, if you have design problems, you can email your design files to receive assistance. We constantly monitor the email account throughout the day. When sending your request to us, please be sure to include your full name, company name, and your contact information for efficient processing of your request.

The technical support email address is soc_tech@microsemi.com.

My Cases

Microsemi SoC Products Group customers may submit and track technical cases online by going to My Cases.

Outside the U.S.

Customers needing assistance outside the US time zones can either contact technical support via email (soc_tech@microsemi.com) or contact a local sales office. Sales office listings can be found at www.microsemi.com/soc/company/contact/default.aspx.

ITAR Technical Support

For technical support on RH and RT FPGAs that are regulated by International Traffic in Arms Regulations (ITAR), contact us via soc_tech_itar@microsemi.com. Alternatively, within My Cases, select Yes in the ITAR drop-down list. For a complete list of ITAR-regulated Microsemi FPGAs, visit the ITAR web page.

Microsemi Corporate Headquarters
One Enterprise, Aliso Viejo CA 92656 USA
Within the USA: +1 949-380-6100
Sales: +1 949-380-6136
Fax: +1 949-215-4996

Microsemi Corporation (NASDAQ: MSCC) offers a comprehensive portfolio of semiconductor solutions for: aerospace, defense and security; enterprise and communications; and industrial and alternative energy markets. Products include high-performance, high-reliability analog and RF devices, mixed signal and RF integrated circuits, customizable SoCs, FPGAs, and complete subsystems. Microsemi is headquartered in Aliso Viejo, Calif. Learn more at www.microsemi.com.

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