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Altera_Forum
Honored Contributor
11 years agoUsing LVDS channels in the same bank driven by separate PLLs
We are trying to make sure that our project satisfies one of the guidelines in the Cyclone V Device Handbook on pages 5-13 and 5-14. The guideline states: "You can use both corner PLLs to drive the L...
Altera_Forum
Honored Contributor
11 years agoBasically, in an IO bank you have pins like:
PLL_T 0 <-> 1 <-> 2 <-> 3 <-> PLL_B In this, all 0 to 3 RX channels can be driven by one PLL, and all of the TX channels can be driven by the other. Alternatively, channels 0 and 1 can be driven by PLL_T (both RX and TX). Channels 2 and 3 can be driven by PLL_B at the same time (both RX and TX) However, channels 0 and 2 can't be driven by PLL_T if channels 1 and 3 are being driven by PLL_B. In otherwords they can't be interleaved. So the following configurations work: (A) 0 <=> PLL_T 1 <=> PLL_T 2 <=> PLL_T 3 <=> PLL_T (B) PLL_B <= 0 <= PLL_T PLL_B <= 1 <= PLL_T PLL_B <= 2 <= PLL_T PLL_B <= 3 <= PLL_T (C) 0 <=> PLL_T 1 <=> PLL_T 2 <=> PLL_B 3 <=> PLL_B But the following will not work: (D) 0 <=> PLL_T 1 <=> PLL_B 2 <=> PLL_T 3 <=> PLL_B (E) 0 <=> PLL_T 1 <=> PLL_B 2 <=> PLL_B 3 <=> PLL_T