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TMS320F28335-Q1: EMIF connection of AD2S1205

Part Number: TMS320F28335-Q1
Other Parts Discussed in Thread: TMS320F28335

Dear Sir,

I am designing new hardware for AD2S1205 resolver reading device with C2000 processor.

I have a reference schematics from Chinese EVAL-KIT for FOC motor drive with Resolver Decoding.

The AD2S1205 data of resolver position can be read from Signal DB-0 to DB-11 in 12-bits resolution.


However, the evaluation board schematics are connected not in sequencing like my though.

They are connected like below.


TMS320F28335 :: AD2S1205


XD2 :: DB11

XD1 :: DB10


XD4 :: DB09

XD3 :: DB08


XD6 :: DB07

XD5 :: DB06


XD8 :: DB05

XD7 :: DB04


XD10 :: DB03

XD9 :: DB02


XD12 :: DB01

XD11 :: DB00


AS you may see above, they are connected revesingly, and vice versa in pair.

(For reversing connection, it is making sense for data MSB first.)

But Why it need to connect vice versa in pair, Does anyone have any idea for this reason?

Thank you in advance 

Happy Chrismas !!

Narudol T.