Altera Stratix GX Guide de l'utilisateur Page 39

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Altera Corporation 2–21
January 2005 Stratix GX Transceiver User Guide
Stratix GX Analog Description
Figure 2–13. MegaWizard Plug-In Manager - ALTGXB (Page 1 of 7) - General (1)
Notes (1)(4)
Notes to Figure 2–13:
(1) Option available in receiver-only mode: Supports use of the transmitter PLL even when the transmit channel is disabled.
Provides a non-recovered clock output for the logic array.
(2) Enables the transmitter PLL to train the receiver PLL: Use this option to support additional multiplication factors for
the receiver PLL. This option also supports the separation of receiver and transmitter reference clocks. An additional
input receiver reference clock (rx_cruclk) is available when this option is turned off. The first option that is
enabled is needed for non-encoded 16-bit modes with a line rate of 2,600 Mbps or greater. For more details regarding
this feature, refer to “Clock Synthesis” on page 2–6.
(3) Selectable High and Low: High bandwidth supports faster lock times. It also tracks higher frequency jitter (based on
the –3-db frequency of the PLL gain plot) on the input clock. Low bandwidth has a smaller pass band to filter out
more high-frequency jitter, but has a slower lock time.
(4) Selectable PPM difference tolerance {125, 250, 500, 1000} between the Receiver PLL VCO and the CRU clock: This is one of
three parameters that affect the rx_freqlocked signal. If an out-of-tolerance event occurs, rx_freqlocked goes
low.
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