Life is full of funny scenarios, like the two situations where
north + south = west. In Silicon Valley, 680 South becomes
280 North, even though you're really headed west. And second, Cypress Semiconductor's West Bridge product line integrates the functionality of traditional North and South bridges.
Of course, the first West Bridge product is named after an actual Bay Area bridge—the Antioch. But unlike its real-world counterpart, Cypress' bridge can never be overloaded with traffic.
Rather, it combines a memory controller hub (northbridge)
and I/O controller hub (southbridge) that targets USB devices
and keeps the traffic flowing smoothly between the USB, memory, and host processor (). To "police" the data,
Antioch uses what Cypress calls the simultaneous link to independent multimedia (SLIM) architecture.
Cypress developed Antioch because of the excruciating wait
in downloading MP3s to cell phones via USB. Currently, downloading 100 MP3s of average size takes an hour. Cyrpess decided that a target of less than five minutes would be much more
acceptable. Also, Antioch lets users receive phone calls right in
the middle of all that downloading.
The high-speed USB support includes an integrated transceiver
that's USB 2.0 compliant at 480 Mbits/s over 16 configurable
endpoints. The mass storage interface support includes the latest removable (SDIO/MMC+) and embedded (NAND flash/harddisk drive) devices. Full NAND flash management (error correction
code, wear-leveling, and bad block management) also is included.
Antioch provides special cell-phone support features, such as
26- and 19.2-MHz clock inputs and a low-power, 1.8-V core. It
comes in a small footprint (6- by 6-mm, 0.5-mm pitch fine-pitch
ball-grid array).
The Antioch devices are currently sampling with full production
sometime this quarter. Antioch costs less than $4 in 500,000unit quantities.
Cypress Semiconductor
www.cypress.com