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　　Chapter 1 Product Overview The i.MX23 is an applications processor targeted at devices that require low power， high performance， high integration and quality audio and video playback. This chapter provides a general overview of the i.MX23 product and describes hardware features， application capability， design support， and additional documentation. See Table 1-1， and the pinout information in Chapter 36， “Pin Descriptions，” for more detailed information about which functions described later in this document are supported in which package and part number

　　Hardware Features ? ARM926 CPU Running at 454 MHz — Integrated ARM926EJ-S CPU — 16-Kbyte data cache and 16-Kbyte instruction cache — ARM Embedded Trace Macrocell （ETM CoreSight 9） （169BGA only） — One-wire JTAG interface — Resistor-less boot mode selection using integrated OTP values ? 32 Kbytes of Integrated Low-Power On-Chip RAM ? 64 Kbytes of Integrated Mask-Programmable On-Chip ROM ? 1 Kbit of On-Chip One-Time-Programmable （OCOTP） ROM ? Universal Serial Bus （USB） High-Speed （Up to 480 Mb/s）， Full-Speed （Up to 12 Mb/s） — Full-speed/high-speed USB device and host functions — Fully integrated full-speed/high-speed Physical Layer Protocol （PHY） — Mass storage host-capable （uncertified by USB-IF） ? Power Management Unit — Single inductor DC-DC switched converter with multi-channel output supporting Li-Ion batteries. — Features multi-channel outputs for VDDIO （3.3 V）， VDDD （1.2 V）， VDDA （1.8 V）， VDDM （2.5V） and regulated 4.2V source. — Direct power from 5-V source （USB， wall power， or other source）， with programmable current limits for load and battery charge circuits.