GENERAL DESCRIPTION
The ADSP-21261 SHARC DSP is a member of the SIMD SHARC family of DSPs featuring Analog Devices Super Harvard Architecture. The ADSP-21261 is source code compatible with the ADSP-2126x, ADSP-21160, and ADSP-21161 DSPs, as well as with first generation ADSP-2106x SHARC processors in SISD (single-instruction, single-data) mode. Like other SHARC DSPs, the ADSP-21261 is a 32-bit/40-bit floating-point processor optimized for high performance signal processing applications with its dual-ported on-chip SRAM, mask-programmable ROM, multiple internal buses to eliminate I/O bottlenecks, and an innovative digital applications interface.

SUMMARY
   High performance 32-bit/40-bit floating-point processor
   Code compatibility—at assembly level, uses the same
      instruction set as other SHARC DSPs
   Single-instruction multiple-data (SIMD) computational
      architecture—two 32-bit IEEE floating-point/32-bit fixed-point/
      40-bit extended precision floating-point computational
      units, each with a multiplier, ALU, shifter, and register file
   High bandwidth I/O—a parallel port, an SPI® port, four serial
      ports, a digital applications interface (DAI), and JTAG
   DAI incorporates two precision clock generators (PCGs), an
      input data port (IDP) that includes a parallel data
      acquisition port (PDAP), and three programmable timers, all
      under software control by the signal routing unit (SRU)
   On-chip memory—1M bit of on-chip SRAM and a dedicated
      3M bit of on-chip mask-programmable ROM
   The ADSP-21261 is available in commercial and industrial
      temperature grades. For complete ordering information,
      see Ordering Guide on Page 44.