Broadband PON on a chip

Freescale Semiconductor has unveiled what it claims is the industry’s first system-on-chip solution for broadband passive optical networking.

Freescale Semiconductor has unveiled what it claims is the industry’s first system-on-chip (SoC) solution for broadband passive optical networking (B-PON).

The device – the MPC8340BPON – integrates Freescale’s e300 core (a PowerPC processor core design), a B-PON media access controller (MAC), Ethernet MACs, and a clock and data recovery (CDR) unit on the same chip.

The MPC8340BPON device’s e300 core operates at 266 MHz and includes a 32KB instruction cache and a 32KB data cache. The processor platform integrates a double data rate (DDR) SDRAM memory controller, three 10/100 Ethernet controllers, dual universal asynchronous receiver/transmitter (DUART), Inter-IC (I2C) bus support, serial peripheral interface (SPI), an interrupt controller, general-purpose input output (GPIO), ATM adaptation layer 5 (AAL5) support, and UTOPIA interfaces.

The PON subsystem is based on Freescale’s discrete MC92701 interface device. The interface fully complies with the ITU-T G.983 specification, which is critical for PON system interoperability used in FTTx network deployments. The PON subsystem supports dynamic bandwidth assignment (DBA), a capability designed to enhance quality of service (QoS) in fibre-based broadband services and to enable additional services that require bandwidth peaks beyond traditional fixed-bandwidth allocations.

The SoC also features integrated clock and data recovery (CDR). Integration of CDR logic provides system developers with the ability to use economical 2R triplexer optical modules, which helps to reduce bill of material and optical module costs.

Projected availability for initial samples of the MPC8340BPON device is Q4 2004.

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