Modulation Period Delta (Jitter); Modulation Type - Fujitsu MB86R02 Jade-D Application Note

Emi optimization using sscg

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5.2.2

Modulation Period Delta (Jitter)

The 'Modulation Period Delta' is the amount by which the period of the modulated output signal is

intentionally 'jittered', i.e. alternately shifted up and down in the frequency spectrum.

5.2.3

The term 'Modulation Type' refers to the direction in which the frequency spectrum of the modulated

output signal is spread. The following modulation types can be selected:

(please note that there is a difference between ES1 and ES2 of the MB86R02 'Jade-D')

ES1

ES2

Non-modulated

i.e. the SSCG is bypassed and the PLL signal is used

Downspread

The frequency spread offset is shifted downwards (to the left) of the frequency spectrum.

This modulation applies to all internal bus clocks and the memory clock domains. It

could be used for the Display Clock signals, but then you must pay very careful

attention to the resulting video timing (whether this causes display driving problems).

Upspread (not useable with MB86R02 'Jade-D'!)

The frequency spread offset is shifted upwards (to the right) of the frequency spectrum

Centerspread (default). The frequency spread offset is centered on the PLL frequency (x-axis

of the frequency spectrum).

Note:

The upspread option is not used with MB86R02 'Jade-D'.

Version 1.30

Figure 3 Modulation Period Jitter

Modulation of internal chip

units and the memory clock

domain

YES

Modulation of the display

clock domain

YES

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Jade-d mb86r02