Aspeed Ast2500 Datasheet -

The Aspeed AST2500 is an 800MHz ARM11-based Baseboard Management Controller (BMC) featuring integrated PCIe 2.0 graphics, DDR3/DDR4 support, and comprehensive IP-based remote management (iKVM). It supports 1920x1200 resolution, IPMI 2.0 compliance, and various hardware monitoring interfaces for server systems. For the full technical datasheet, visit ASPEED Technology. AST2500 - ASPEED Technology

Table_title: AST2500 Table_content: header: | Product Name | AST2500 Advanced PCIe Graphics & Remote Management Processor | row: | ASPEED Technology Inc. ID144U-S2-7109-T.pdf - Apogean

The Aspeed AST2500 is the industry-standard "brain" behind modern server management. This 6th-generation Server Management Processor acts as a Baseboard Management Controller (BMC), allowing administrators to monitor, troubleshoot, and power-cycle servers remotely without physical access. Core Technical Specs Processor: 800MHz ARM11 CPU.

Memory Support: Migrated to DDR4 (up to 1600Mbps) for better performance than previous generations.

Graphics: Integrated PCIe 2D VGA engine, providing local display capability without needing a separate graphics card.

Interfaces: Supports LPC, eSPI slave, and PCI Express for host communication.

OS Support: Primarily runs Linux-based BMC firmware like OpenBMC . Key Features & Benefits AST2500 - ASPEED Technology

Technical Deep Dive: The ASPEED AST2500 BMC Processor ASPEED AST2500

is a 6th-generation server management processor designed to provide robust Baseboard Management Controller (BMC)

capabilities. It functions as a "system-within-a-system," allowing IT administrators to monitor, manage, and recover server hardware remotely, even if the primary operating system is unresponsive. ASPEED Technology Core Architecture and Hardware Specifications Based on the ARM11 processor running at

, the AST2500 offers a significant performance jump over its predecessors by moving to modern memory standards. ASPEED Technology Inc. Processor: ARM11 @ 800MHz. Memory Support: Supports both DDR3 (800Mbps) DDR4 (1600Mbps)

16-bit SDRAM, with capacity up to 1GB and optional ECC support. Integrated PCIe 2D VGA controller supporting resolutions up to 1920x1200@60Hz Networking: Features dual 10/100/1000M bps MAC for dedicated management LAN connectivity. Available in a 456-pin TFBGA (19mm x 19mm) package. ASPEED Technology Key Remote Management Features The AST2500 is the industry standard for

compliant remote management. It integrates several critical functions into a single SoC: AST2500 - ASPEED Technology

Table_title: AST2500 Table_content: header: | Product Name | AST2500 Advanced PCIe Graphics & Remote Management Processor | row: | ASPEED Technology Baseboard Management Controller (BMC) - ASPEED Technology

ASPEED AST2500 is a 6th-generation Baseboard Management Controller (BMC) System-on-Chip (SoC) designed to provide remote monitoring and management for high-performance host systems, such as servers and storage devices. Core Processing and Memory Aspeed Ast2500 Datasheet

introduces significant performance upgrades over previous generations by moving to a faster processor and modern memory standards:

Processor: Features an 800MHz ARM11 (specifically ARM1176JZS) CPU.

Memory Support: Migrates from DDR3 to DDR4 1600Mbps double data rate memory to meet the higher performance requirements of modern server systems.

Onboard Flash: Typically utilizes a 128 Mb SPI NOR Flash for system BIOS and management tasks. Key Integrated Features

Beyond its management duties, the SoC integrates several modules that reduce the need for external components on the motherboard:

Graphics: Includes an on-chip PCIe 2D VGA (2D Video Graphic Adapter) to provide local display capabilities for servers without requiring a dedicated VGA add-on card.

Connectivity: Features integrated Gigabit Ethernet, USB, SD/MMC, SPI, and I2C controllers for robust input/output handling.

Remote Management: Supports advanced Intelligent Platform Management Interface (IPMI) features, including rKVM (Remote Keyboard, Video, and Mouse) and Serial Over LAN (SOL). Technical Specifications Summary Specification Generation 6th Generation BMC SoC CPU Core ARM1176JZS @ 800MHz Memory DDR4-1600 Support Graphics Integrated PCIe 2D VGA Package Size 19mm x 19mm Ball Pitch I/O Support GbE, USB, SPI, I2C, UART Security and Maintenance

Vulnerabilities: Users should be aware of past security vulnerabilities like CVE-2019-6260, which could allow unauthorized read/write access to the BMC's physical address space via AHB bridges.

Firmware: Supported by platforms like AMI MegaRAC SP-X and open-source initiatives like OpenBMC. AST2500 - ASPEED Technology

A Deep Dive into the Aspeed AST2500 Datasheet

The Aspeed AST2500 is a highly integrated BMC (Baseboard Management Controller) SoC (System-on-Chip) designed for server and data center applications. In this blog post, we will take a detailed look at the AST2500 datasheet, exploring its features, specifications, and capabilities.

Overview

The AST2500 is a 32-bit ARMv7-A compliant SoC that integrates a wide range of peripherals and interfaces, making it an ideal solution for BMC applications. The device is designed to provide a high level of integration, low power consumption, and a small form factor, making it suitable for various server and data center platforms. The Aspeed AST2500 is an 800MHz ARM11-based Baseboard

Key Features

The AST2500 SoC offers a range of key features, including:

ARMv7-A Core: The AST2500 is powered by a 32-bit ARMv7-A core, which provides a balance between performance and power consumption.
Memory Interface: The device supports a range of memory interfaces, including DDR3, DDR3L, and LPDDR2.
Peripheral Interfaces: The AST2500 offers a wide range of peripheral interfaces, including:
- USB 2.0
- UART
- I2C
- SPI
- I2S
- GPIO
Video Engine: The device features a built-in video engine that supports VGA, DVI, and HDMI outputs.
Security: The AST2500 includes a range of security features, including secure boot, encryption, and secure key storage.

Specifications

The AST2500 SoC has the following specifications:

CPU: 32-bit ARMv7-A core, up to 1.2 GHz
Memory: Up to 2 GB DDR3, DDR3L, or LPDDR2 memory
Package: 49-ball BGA package, 7 mm x 7 mm
Temperature Range: -40°C to 85°C
Voltage: 3.3V

BMC Features

The AST2500 is designed to provide a range of BMC features, including:

IPMI 2.0: The device supports IPMI 2.0, which provides a standardized interface for BMC management.
KVM: The AST2500 supports KVM (Keyboard, Video, and Mouse) redirection, which allows for remote management of servers.
Virtual Media: The device supports virtual media, which enables remote access to media devices.

Power Management

The AST2500 includes a range of power management features, including:

Power Gating: The device supports power gating, which allows for dynamic control of power consumption.
Clock Gating: The AST2500 supports clock gating, which enables dynamic control of clock frequencies.

Security Features

The AST2500 includes a range of security features, including:

Secure Boot: The device supports secure boot, which ensures that only authorized firmware can be executed.
Encryption: The AST2500 supports encryption, which protects data from unauthorized access.
Secure Key Storage: The device includes secure key storage, which provides a secure location for storing sensitive data.

Conclusion

The Aspeed AST2500 is a highly integrated BMC SoC that offers a range of features and specifications that make it suitable for server and data center applications. Its ARMv7-A core, memory interface, and peripheral interfaces provide a high level of integration, while its power management and security features ensure low power consumption and secure operation. The AST2500 is an ideal solution for BMC applications that require a high level of integration, low power consumption, and secure operation.

References

Aspeed AST2500 Datasheet: [insert link]
Aspeed Technology: [insert link]

I hope this helps! Let me know if you have any questions or if you'd like me to clarify anything. ARMv7-A Core : The AST2500 is powered by

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6. Networking & Communication

| Interface | Details | |-------------------|--------------------------------------------------------------| | Ethernet MAC | 2x RGMII/RMII (10/100/1000 Mbps), supports NC-SI, MCTP | | PCIe | 1x Gen2 (5 GT/s), configurable as Root Complex or Endpoint | | USB | 2x USB 2.0 Host ports (with integrated PHY) | | UART | 6x (up to 921600 bps, one debug UART) | | I2C Bus | 8x (support SMBus, PMBus) | | SPI Master | 2x (up to 50 MHz) | | ADC | 8-channel, 10-bit, 1 MSPS (0-1.8V range) | | PWM / Fan Tach | 8x PWM + 8x tachometer inputs | | GPIO | Up to 208 pins (multiplexed with other functions) |

3.3 Thermal Management

The 15x15mm TFBGA package has a thermal resistance (junction-to-ambient) of approximately 18°C/W. Under full load (video encoding + network + PCIe), the chip can dissipate 1.8W, resulting in a 32°C rise above ambient. In a closed server chassis, a heatsink is recommended.

3. Core Processor Subsystem

CPU: ARM Cortex-A7, 32-bit RISC, up to 800 MHz (industrial temp range up to 600 MHz typical)
Cache: L1 I/D 8KB each, L2 256KB unified
MMU: Supports Linux, U-Boot, and other OSs
Interrupt Controller: GIC-400

7. How to Obtain the Full AST2500 Datasheet

The public version of the AST2500 datasheet (often version 1.05) is available on Aspeed’s website. However, it is 430 pages of condensed technical data. For the full unrestricted datasheet (including timing diagrams, AC/DC specs, and package dimensions), you typically need:

An NDA with Aspeed Technology Inc.
A legitimate business case (motherboard manufacturer, ODM, or large enterprise).
Access to the Aspeed customer portal.

Pro tip: Start with the public datasheet to scope your design, then request the "Hardware Design Guide" and "Register Reference" – these are more valuable for actual PCB layout and firmware programming.

1. Overview: What is the Aspeed AST2500?

The Aspeed AST2500 is a 7th-generation server management processor. It is a System-on-Chip (SoC) specifically designed for BMC applications. Unlike general-purpose microcontrollers, the AST2500 integrates a rich set of I/O, a high-performance 2D graphics controller, and a video capture engine to enable "KVM over IP" (Keyboard, Video, Mouse over Internet Protocol).

Key Differentiators from the Datasheet:

Core Processor: ARM11-based (ARM926EJ-S variant) running up to 800 MHz.
Package: 576-pin TFBGA (15x15mm).
Temperature Range: Industrial (-40°C to +85°C) and Commercial (0°C to +70°C) variants exist.
Process Node: 28nm (improved power efficiency over AST2400’s slower node).

When you open the AST2500 datasheet, the first thing you notice is the block diagram: a central ARM core surrounded by a sea of controllers—PCIe, DDR3/DDR4, eMMC, SPI, LPC, I2C, and a 10/100/1000 Ethernet MAC.

8. Differences from AST2400 (Notable in Datasheet)

Faster CPU (800 MHz vs 400 MHz).
DDR4 support (AST2400: DDR3 only).
Enhanced 2D graphics and higher display resolution.
More I2C buses (8 vs 5).
PCIe Gen2 (vs Gen1).

Conclusion: Mastering the Datasheet

The Aspeed AST2500 Datasheet is not light reading. It is a dense, 600-page tome of electrical constraints, timing diagrams, and register masks. But for the system engineer, it represents stability. The AST2500 is the "AK-47" of BMCs—not the newest, not the fastest, but it boots every time, runs forever, and the errata are well documented.

Final Checklist before ordering PCB fabrication:

Have you verified the power sequencing delay (0.9V -> 1.8V -> 3.3V)?
Did you pull the RGMII clock lines per Chapter 12.4?
Did you route the 25MHz crystal close to pins 23 and 24 with correct load capacitors (18pF typical)?
Is your DDR4 routing matched to the length specs in Appendix C?

If you answered "Yes" to all four, your AST2500 will likely work on the first spin. If not, go back to the Aspeed AST2500 Datasheet and start again.

Further Reading (Based on the Datasheet References):

PCIe Base Specification Revision 2.0 (for endpoint configuration)
SMBIOS Specification (for IPMI integration)
DDR4 JEDEC Standard JESD79-4

Disclaimer: Specifications mentioned are for illustrative purposes based on public revisions. Always consult the latest NDA-locked datasheet from Aspeed for production designs.

The Aspeed AST2500 is a 6th-generation System-on-Chip (SoC) acting as a Baseboard Management Controller (BMC) for server management, featuring an 800MHz ARM11 CPU and DDR4 support. It offers out-of-band management, KVM over IP, and integrated 2D VGA graphics, making it suitable for secure, remote server administration. For technical specifications and data sheets, visit ASPEED Technology. AST2500 - ASPEED Technology