AT75C220-Q208

The AT75C220-Q208 is a Smart Internet Appliance Processor (SIAP) built around an ARM7TDMI 32-bit core running at 40 MHz, paired with a 16-bit fixed-point OakDSPCore co-processor. It targets professional Internet appliance applications, such as Ethernet IP phones and embedded networking devices, combining general-purpose control with on-chip DSP capabilities for voice and signal processing.

Designed for integration in networked embedded systems, the device provides a blend of compute, memory, I/O and networking interfaces to simplify system design while supporting available software stacks and DSP algorithm libraries.

Key Features

• Core Architecture  ARM7TDMI 32-bit processor core operating at 40 MHz providing embedded control and application processing; includes an OakDSPCore 16-bit fixed-point DSP co-processor for dedicated signal-processing tasks (OakDSPCore).
• On-chip Memory  256 × 32-bit boot ROM and 88 KB of integrated fast RAM for immediate code and data storage; on-chip SDRAM controller for external memory support and system expansion.
• Dual Ethernet MACs  Dual 10/100 Mbps Ethernet MAC interfaces with voice priority to support simultaneous network ports and voice/data separation for IP telephony and network appliances.
• Interfaces and Peripherals  Industry-standard Serial Peripheral Interface (SPI), two USARTs with FIFO and modem control lines, codec interface, up to 24 GPIO pins, and additional interfaces for system integration.
• Timers and System Control  Three 16-bit timers/counters, an additional watchdog timer, and a multi-level priority, individually maskable vectored interrupt controller for responsive real-time control.
• External Bus and I/O  Flexible external bus interface with programmable chip selects and SDRAM controller to support a variety of memory and peripheral mappings; I/O voltage domain at 3.3 V for standard logic compatibility.
• Power Domains  2.5 V supply for core and PLL pins and 3.3 V for I/O pins as documented in device pinout and power descriptions.
• Package and Mounting  Supplied in a 208‑lead PQFP package (28 × 28 mm) suitable for surface-mount assembly in compact embedded designs.
• Debug and Development  JTAG debug interface and available software development suites; supported by a port of the Linux kernel and a set of tunable DSP algorithms and application-level software modules for networking and voice functions.

Typical Applications

• IP Telephony / VoIP Phones  Dual Ethernet MACs and onboard DSP support voice compression, echo cancellation and voice-priority networking for Ethernet IP phone designs.
• Smart Internet Appliances  Integrated processor, DSP, network interfaces and SDRAM controller enable compact networked appliances that require voice and data handling.
• Embedded Network Devices  Use in Ethernet-connected embedded controllers and gateways where protocol stacks run on the ARM core while the DSP handles signal processing tasks.

Unique Advantages

• Integrated DSP and MCU  Combines an ARM7TDMI application core with an OakDSPCore co-processor to separate control and signal-processing workloads within a single device.
• Dual 10/100 Ethernet with Voice Priority  Two MAC interfaces with voice-priority capability allow dedicated network paths and QoS-aware handling for voice-centric products.
• On-chip Boot ROM and Fast RAM  Built-in 256×32-bit boot ROM and 88 KB fast RAM reduce external memory requirements and speed system bring-up.
• Flexible Memory and Bus Options  On-chip SDRAM controller and programmable external bus chip selects simplify interfacing to external memory and peripherals.
• Software Ecosystem  Available development suites, a Linux kernel port and tunable DSP algorithm libraries accelerate product development for networking and voice applications.
• Compact Surface-Mount Package  208‑lead PQFP (28×28) package supports high-density board layouts for space-constrained systems.

Why Choose AT75C220-Q208?

The AT75C220-Q208 positions itself as a highly integrated SIAP solution combining an ARM7TDMI application processor with a specialized OakDSPCore co-processor, dual Ethernet MACs, on-chip memory and an SDRAM controller. This combination enables designers to partition protocol, control and real-time signal-processing tasks efficiently within a single device.

It is particularly suited to developers of professional Internet appliances and embedded networked products who need a ready software ecosystem, deterministic timers and prioritized interrupt handling. The included development support and application-level modules help shorten development cycles and deliver robust, scalable networked devices.

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