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Quartus II Settings File Reference Manual - Altera

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6–158 Chapter 6: Fitter Assignments<br />

GXB_0PPM_CLOCK_GROUP<br />

GXB_0PPM_CLOCK_GROUP<br />

Type<br />

Specifies a group of gigabit transceiver block core clocks that have zero parts per<br />

million (ppm) difference. The clock driver source specified in the gigabit transceiver<br />

block 0 ppm clock group driver must have a difference of 0 ppm compared with all<br />

clocks specified in the gigabit transceiver block 0 ppm clock group. You must connect<br />

the specified clock driver to all specified destinations in the gigabit transceiver block 0<br />

ppm clock group. Do not reconfigure the gigabit transceiver block 0 PPM clock group<br />

driver differently from other clocks in the gigabit transceiver block 0 ppm clock<br />

group, and do not disable the gigabit transceiver block 0 ppm clock group driver<br />

source when the destination gigabit transceiver block receiver or transmitter is<br />

listening to the signal. Follow the <strong>Altera</strong> High Speed I/O Applications Technical<br />

Support recommendations when using this assignment.<br />

Integer<br />

Device Support<br />

This setting can be used in projects targeting the following device families:<br />

■ Arria GX<br />

■ Stratix <strong>II</strong> GX<br />

Notes<br />

This assignment supports wildcards.<br />

Syntax<br />

set_instance_assignment -name GXB_0PPM_CLOCK_GROUP -to -entity<br />

<br />

<strong>Quartus</strong> <strong>Settings</strong> <strong>File</strong> June 2012 <strong>Altera</strong> Corporation<br />

<strong>Reference</strong> <strong>Manual</strong>

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