Because the bank-to-pin mapping is reversed on a Flipped DDRMC, the physical bank with unused pins changes even when the packing option is the same. Refer to the following table.
| Packing | Normal DDRMC: Unused Pins In | Flipped DDRMC: Unused Pins In |
|---|---|---|
| Packed Right | First bank (for example, Bank 700) | Third bank (for example, Bank 705) |
| Packed Left | Third bank (for example, Bank 702) | First bank (for example, Bank 703) |
This is expected behavior. Both DDRMCs use the same M*P* positions for
the same signals; the only difference is which physical bank those positions land
in.
The packing option controls which end of the M\*P\* range is populated
with DDR signals.
Figure 1. Packed Right Versus Packed Left
