Altera LVDS SERDES Manual do Utilizador descarregar pdf (Página 16)

DescriptionValueParameter

Specifies the closest achievable tx_outclock phase

shift to the desired tx_outclock phase shift.

Legal values are

dependent on the

fclk and tx_

outclock

frequencies. Refer

to Setting the

Transmitter

Output Clock

Parameters on

page 17.

Actual tx_outclock phase shift

(degrees)

Allows you to specify the ratio of the fast clock

frequency to the outclock frequency (for example,

the maximum number of serial transitions per

outclock cycle).

Legal values are

dependent on the

serialization

factor.

Tx_outclock division factor

Clock Resource Summary Tab

This tab in the parameter editor lists out all the required frequencies, phase shifts, and duty cycles of the

required clocks, including instructions on the required connections. This tab also shows how to configure

and connect an external PLL.

Setting the Receiver Input Clock Parameters

When using non-DPA mode, if you want the SERDES receiver to sample the source synchronous data, you

must specify the inclock relationship to the rx_in data. To do so, type a value in the Desired receiver inclock

phase shift (degrees) parameter. Legal values are evenly divisible by 45. If you enter an illegal value, the

actual phase shift will appear in Actual receiver inclock phase shift (degrees).

For rising inclock edge aligned interfaces to the rx_in data (Figure 4), select 0° as the desired receiver clock

phase shift. The PLL will be set with the required phase shift on fclk to center it at the SERDES receiver.

Figure 4: 0° Edge Aligned inclock x8 Deserializer Waveform With Single Rate Clock

The phase shift you specify will be relative to the fclk which operates at the serial data rate. Phase shift

values between 0° and 360° are used to specify the rising edge of the inclock within a single bit period. The

maximum phase shift value is determined by the following equation:

(Number of fclk periods per inclock period x 360) - 1

Altera LVDS SERDES IP Core User Guide

Altera Corporation

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Clock Resource Summary Tab

2014.08.18

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