BCM8156

Description

The BCM8156 is a fully integrated MSA-compatible multirate SONET/SDH/10-GbE/Fibre-Channel/FEC transceiver operating at 9.953 Gbps, 10.3125 Gbps, 10.519 Gbps, 10.664 Gbps, 10.709 Gbps, 11.095 Gbps, 11.318 Gbps, or 11.352 Gbps. On-chip clock synthesis is performed by the high-frequency, low-jitter PLL, The BCM8156 is allowing the use of a low-frequency reference clock selectable to the line rate divided by either 16 or 64.

The 10G TX clock phase is adjustable for clocked driver applications. An on-chip phase detector and charge pump plus external VCXO implement a cleanup PLL. The cleanup PLL can be used to attenuate jitter on the CDR recovered clock for loop timing applications or to provide a low-jitter reference clock from a noisy system clock. Any SONET timing mode may be configured with the new BCM8156 timing architecture, making the timing mode and cleanup functions user-selectable in the field rather than during manufacturing, therefore, simplifying engineering and manufacturing requirements.