16-Bit USB Controllers Push Memory/Performance Limitations

April 28, 2003
Packing a 16-bit RISC processor core into a USB controller eliminates many memory and processor performance limitations and keeps power consumption low. This lets the controllers handle more of the USB processing chores. It's possible to have a...

Packing a 16-bit RISC processor core into a USB controller eliminates many memory and processor performance limitations and keeps power consumption low. This lets the controllers handle more of the USB processing chores. It's possible to have a single-chip solution when the on-chip processor can handle external peripheral management with Cypress Semiconductor's EZ-Host CY7C67300 and EZ-OTG Y7C-67200 embedded host family.

The EZ-Host suits fixed devices, like set-top boxes, wireless access points, and automotive environments. The chip complies with the USB 2.0 standard. It sports a pair of 12-Mbit/s USB SIEs (serial interface engines). Each independent SIE has a pair of USB ports that can be configured in an upstream/downstream mode or a master-to-master mode for linking a pair of PCs.

The EZ-Host has an 8-kbyte ROM BIOS and 16 kbytes of on-chip RAM. An external interface handles SDRAM, SRAM, and flash memory. The I2C can be attached to a small, serial EEPROM for downloading an application when the chip is operating in standalone mode. The BIOS allows the chip to be easily interfaced to an external host.

The EZ-OTG handles the new On-The-Go USB standard, which targets mobile applications like digital cameras and cell phones. It has two SIEs, but each has only a single USB port. The EZ-Host is available in a 100-pin TQFP for $4.99. The EZ-OTG, which comes in a 48-ball FBGA, costs $3.99.

Cypress Semiconductor Inc. • www.cypress.com

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