Description

The OS8104A is a highly integrated C-MOS Network Interface Controller with a full-featured interface to the 24.5 Mbits/s MOST optical network system.
All relevant network management on the data link layer level is on-chip, including stream data allocation, syn-chronization, and network detection. An ultra-low jitter PLL guarantees high quality audio and video transmission and clock recovery over a wide frequency range. Coding is optimized for plastic optical fiber.
The OS8104A works at an ultra-low bit error rate supporting real-time synchronous data traffic of up to 15 stereo channels simultaneously. In addition to the control channel, some of the available bandwidth can be allocated to asynchronous packet data transfer.
Programmable serial and parallel real-time data interfaces with different clock and data modes support various consumer electronic devices such as Codecs, converters and DSPs.

Block Diagram

Functional Description

The OS8104A contains a MOST core and several peripherals including a clock manager, source data ports, a control port, and a network interface. The network interface includes an ultra-low jitter phase lock loop (PLL) and a channel demodulator on the input. The network output provides a channel coded signal. These signals can be connected directly to an optical receiving/transmitting device (FOT unit) or a balanced line driver.
The OS8104A runs on a 3.3 V power supply. Comparatively, the OS8104A uses less than half of the power consumption of the OS8104.
Various A/D converters, D/A converters, digital signal processors and Media Players (CD-AUDIO / VIDEO / DVD etc.) can be synchronized using one of the many clock and serial interface modes.
The source data ports provide a data interface to the serial bit stream on the MOST Network. Data sources and sinks can be linked to either a serial or parallel source port in order to send or receive data to/from another node on the network. The OS8104A operates in a peer-to-peer network or host centric architecture.

MOST Network Implementation

An example implementation including Audio/Video, Telephone and Computing Applications is shown above. Up to 64 devices with as many as 15 MPEG 1 Audio/Video channels can be implemented on one fiber without a central host.