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SN65DSI86: How can SN65DSI86 support 2% spread spectrum?

Part Number: SN65DSI86
Other Parts Discussed in Thread: SN65DSI85

hi,

the register 0x93 in SN65DSI86 can enable spread spectrum.

the max is 5000ppm. this is about 0.5%, right?

How can I have 2% spread spectrum?

can I use external refCLK with 2% spread spectrum for this purpose? any side effect?

BR,

frank