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Cirrus CS89712 "massively integrated" system-on-chip
[Vendor: Cirrus Logic]

The CS89712 is designed for ultra-low-power communication applications such as: VoIP telephony, screen phones, Web appliances, email appliances, digital picture frames, and other network applications. With the added capabilities for expansion on the CS89712, router and bridges for home networking or wireless networking can be implemented.

The core logic functionality of the device is built around an ARM720TDMI processor with 8 KB of four-way set-associative unified cache and a write buffer. Incorporated into the ARM720TDMI is an enhanced memory management unit (MMU) which allows for support of sophisticated real-time operating systems such as VxWorks or Linux.

In order to minimize external components, CS89712 includes all major system level peripherals, including: 10Base-T Ethernet MAC and PHY, Ethernet buffer memory, LCD controller, expansion memory controller, peripheral ports, internal zero wait state SRAM memory, and internal boot ROM. JTAG is also available, to speed up development with an in circuit emulator (ICE) and for use in production test.

Summary of features:
  • Ultra low power 66 DMIPS ARM720TDMI CPU -- performance matches a 100-MHz Intel Pentium based PC
  • Dynamically programmable clock speeds of 18, 36, 49, and 74 MHz for power savings
  • Ultra Low-Power 2.5 V implementation for power critical embedded designs
  • On-chip 10BaseT Ethernet controller MAC and PHY -- includes all of the analog and digital circuitry needed for a complete Ethernet circuit
  • On-chip LCD controller -- interfaces directly to a single-scan monochrome panel
  • Programmable external memory controller -- supports SDRAM, SRAM, ROM, and FLASH; decodes 5 separate memory segments of 256 MB; supports Removable FLASH card interface
  • 48 KB on-chip SRAM -- for fast program execution and/or as a video frame buffer
  • On-chip ROM -- for manufacturing support
  • EEPROM support -- for jumperless configuration of Ethernet port
  • Extensive power management modes
  • Two UARTs (16550 type) -- 16-byte FIFOs; bit rates to 115.2 kbps; IrDA supported on one channel
  • Four synchronous serial interfaces support SSI (Master mode only), SPI, Microwire1, DAI, and CODEC functions (multiplexed)
  • 27-bits general purpose I/O -- three 8-bit and one 3-bit GPIO port; supports scanning keyboard matrix
  • DC-to-DC converter interface (PWM)
  • Two timer/counters
  • Support for up to two external CL-PS6700 PC Card controllers
  • 32-bit real time clock and comparator
  • 256-ball PBGA package
  • Comprehensive suite of software drivers for Linux and other OSes
  • Evaluation kit available with BOM, schematics, layout, and sample code


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