Serial Rate Support; Encoding Support And Clock Multipliers - Xilinx Virtex-5 RocketIO GTP User Manual

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Serial Rate Support

As the Xilinx transceivers continue to migrate, so do the supported serial rates.
shows the rates supported by each MGT and GTP transceiver.
Table A-3: Serial Rate Support
Notes:
1. 100 Mb/s - 500 Mb/s with oversampling.

Encoding Support and Clock Multipliers

Protocol encoding support and clock multiplier support vary depending on the transceiver
generation.
transceiver.
Table A-4: Encoding Support
Encoding Schemes Virtex-II Pro MGT
Virtex-5 RocketIO GTP Transceiver User Guide
UG196 (v1.3) May 25, 2007
REF_CLK_V_SEL
REFCLK
0
1.5V
REFCLK2
1
0
REFCLKSEL
1
BREFCLK
0
2.5V
BREFCLK2
1
Virtex-II Pro FPGA
clkoutnorth
IBUFDS
Figure A-1: Reference Clock Selection for Each Device
Virtex-II Pro MGT
0.622 – 3.125 Gb/s
Table A-4 shows the encoding support available in each MGT and GTP
8B/10B
64B/66B
SONET
www.xilinx.com
REFCLK_OUT
to PCS and PMA
clkinsouth
GREFCLK
Dedicated
Clock
Routing
clkinnorth clkoutsouth
Virtex-5 FPGA
Virtex-4 MGT
0.622 – 6.5 Gb/s
Virtex-4 MGT
Yes Yes
(1)
Yes Yes
(1)
Yes Yes
Primary Differences
PMA CLKSEL
REFCLK1
REFCLK_OUT
REFCLK2
to PCS and PMA
GREFCLK
Note: All Virtex-4 clocks are differential.
Virtex-4 FPGA
GTP_DUAL Tile
clkin
PLL
Note: Routing is controlled by software based
on the instantiated GTP_DUAL tile and
the selected clocking source
UG196_a_01_011507
Virtex-5 GTP Transceiver
0.100 – 3.125
(1)
Virtex-5 GTP Transceiver
Yes
(1)
Yes
Yes
Table A-3
259