3.6 Xilinx lOGigabit Ethernet Logic
The PCS layer connects between the Xilinx RocketPHY™ lOGbps transceivers and
Xilinx LogicCORE™ XAUI core. The PMA is implemented by RocketPHY transceivers
and the MAC layer is implemented by the Xilinx LogicCORE™ MAC. The Digital
Clock Manager Core (DCM) was used for the clock synthesis, coarse or fine phase
adjustments and synchronization.
3.6.1 Xilinx RocketPHY^-lOGbps Transceivers
The RocketIO transceivers are based on Mindspeed’s SkyRail™ technology. The
transceiver module is designed to operate at any serial bit rate in the range of 600 Mb/s to
3.125 Gb/s per channel. Each serial link operates at 3.125 Gb/s to accommodate both data
and the overhead associated with 8B/10B coding. The operating frequency is implied by
the received
data,
the
reference
clock applied,
and the
SERDES_10B
(serializer/deserializer) attribute set by the user.
The RocketIO transceiver comprises of the Physical Medium Attachment (PMA) and
Physical Coding Sublayer (PCS). The PMA contains the serializer/deserializer
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(SERDES), TX and RX buffers, clock generator, and clock recovery circuitry. The PCS
contains the 8B/10B encoder/decoder and the elastic buffer supporting channel bonding
and clock correction. The PCS also handles Cyclic Redundancy Check (CRC).
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