The USS2828 system-on-a-chip (SoC) controller combines a USB 2.0 interface and a 32-bit embedded processor to triple the data-processing throughput of similar controllers based on 8-bit 8051 embedded processors. Developed by Agere Systems, it also boasts a similar price point compared to the 8-bit-based devices.
The chip's high-speed USB 2.0 port supports 480- and 12-Mbit/s data-transfer rates. Additionally, its ARM7TDMS processor offers a 40-MIPS throughput that lets applications like digital cameras, MP3 players, and image scanners process faster or provide extra features.
This controller includes 8 kbytes of RAM and 16 kbytes of ROM, two timers, a direct memory access controller, a memory controller for external memory, a programmable interrupt controller, and a general-purpose I/O interface with up to 24 programmable I/O lines (see the figure). Also available on the chip are a JTAG test port and an I2C serial port.
The chip can tie into a host system through the programmable I/O lines. Or, it can tie into a host system by using a 16-bit memory interface.
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