Legacy Products
CD2458,CD2458A
This 24 bit DSP CD2458 was designed as an enhanced version of the CD2450A in 1999, for audio compression application purpose. The design came with a strong barrel shifter with normalizer, practical fast looping function as well as limited double word operation capabilities. The gate count jumped up to one fold of its predecessor CD2460A to gain these enhancement, and reduced the necessary MIPS count to one half. The design conceived a distortion in its spec due that it just added enhancements based on the CD2460A architecture, which has lead another migration to our latest DSP cores CD2470A,80A,90A in 2004.
CD2450,CD2450A
This 16 bit DSP was originally designed in NON-HDL (Transistor level hand drawn layout) DSP core, back in 1994. The architecture of it was still aiming at very low-end hand held applications that needed physically small die size, thus many DSP-oriented silicon space consuming "parts" like barrel shifter, No-overhead repeating etc. were minimized in the original spec. Nonetheless many designs based on this DSP core are still surviving in the market by adding small improvements on the original design. The CD2450 was upgraded and converted to synthesizable HDL design in 1997 responding to many customer's requests. A 24 bit version of the CD2450 was also available as CD2460, though most of 24 bit DSP users actually employed the CD2458 or CD2458A. Clarkspur recommends the CD2470A for new designs.
