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Why the DDR3 Data constraints like that?

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                                  MIN ETCH   MAX ETCH
                                      (mm) (mm)

ECS DATA1                  17.400   17.500

ECS DATA1_PLUS       19.900    20.000
ECS DATA2                    18.000    18.100
ECS DATA2_PLUS         20.500   20.600

|
DATA1PLUS_BUS (24) | DATA1_PLUS | | | | | | | | |
DQS0 | DATA1_PLUS | | | | | | | | |
DQS0# | DATA1_PLUS | | | | | | | | |
DQS2 | DATA1_PLUS | | | | | | | | |
DQS2# | DATA1_PLUS | | | | | | | | |
DQS4 | DATA1_PLUS | | | | | | | | |
DQS4# | DATA1_PLUS | | | | | | | | |
DQS6 | DATA1_PLUS | | | | | | | | |
DQS6# | DATA1_PLUS | | | | | | | | |
DQ0 | DATA1_PLUS | | | | | | | | |
DQ1 | DATA1_PLUS | | | | | | | | |
DQ2 | DATA1_PLUS | | | | | | | | |
DQ3 | DATA1_PLUS | | | | | | | | |
DQ16 | DATA1_PLUS | | | | | | | | |
DQ17 | DATA1_PLUS | | | | | | | | |
DQ18 | DATA1_PLUS | | | | | | | | |
DQ19 | DATA1_PLUS | | | | | | | | |
DQ32 | DATA1_PLUS | | | | | | | | |
DQ33 | DATA1_PLUS | | | | | | | | |
DQ34 | DATA1_PLUS | | | | | | | | |
DQ35 | DATA1_PLUS | | | | | | | | |
DQ48 | DATA1_PLUS | | | | | | | | |
DQ49 | DATA1_PLUS | | | | | | | | |
DQ50 | DATA1_PLUS | | | | | | | | |
DQ51 | DATA1_PLUS | | | | | | | | |
DATA1_BUS (20) | DATA1 | | | | | | | | |
DM0 | DATA1 | | | | | | | | |
DM2 | DATA1 | | | | | | | | |
DM4 | DATA1 | | | | | | | | |
DM6 | DATA1 | | | | | | | | |
DQ4 | DATA1 | | | | | | | | |
DQ5 | DATA1 | | | | | | | | |
DQ6 | DATA1 | | | | | | | | |
DQ7 | DATA1 | | | | | | | | |
DQ20 | DATA1 | | | | | | | | |
DQ21 | DATA1 | | | | | | | | |
DQ22 | DATA1 | | | | | | | | |
DQ23 | DATA1 | | | | | | | | |
DQ36 | DATA1 | | | | | | | | |
DQ37 | DATA1 | | | | | | | | |
DQ38 | DATA1 | | | | | | | | |
DQ39 | DATA1 | | | | | | | | |
DQ52 | DATA1 | | | | | | | | |
DQ53 | DATA1 | | | | | | | | |
DQ54 | DATA1 | | | | | | | | |
DQ55 | DATA1 | | | | | | | | |
DATA2PLUS_BUS (24) | DATA2_PLUS | | | | | | | | |
DQS1 | DATA2_PLUS | | | | | | | | |
DQS1# | DATA2_PLUS | | | | | | | | |
DQS3 | DATA2_PLUS | | | | | | | | |
DQS3# | DATA2_PLUS | | | | | | | | |
DQS5 | DATA2_PLUS | | | | | | | | |
DQS5# | DATA2_PLUS | | | | | | | | |
DQS7 | DATA2_PLUS | | | | | | | | |
DQS7# | DATA2_PLUS | | | | | | | | |
DQ8 | DATA2_PLUS | | | | | | | | |
DQ9 | DATA2_PLUS | | | | | | | | |
DQ10 | DATA2_PLUS | | | | | | | | |
DQ11 | DATA2_PLUS | | | | | | | | |
DQ24 | DATA2_PLUS | | | | | | | | |
DQ25 | DATA2_PLUS | | | | | | | | |
DQ26 | DATA2_PLUS | | | | | | | | |
DQ27 | DATA2_PLUS | | | | | | | | |
DQ40 | DATA2_PLUS | | | | | | | | |
DQ41 | DATA2_PLUS | | | | | | | | |
DQ42 | DATA2_PLUS | | | | | | | | |
DQ43 | DATA2_PLUS | | | | | | | | |
DQ56 | DATA2_PLUS | | | | | | | | |
DQ57 | DATA2_PLUS | | | | | | | | |
DQ58 | DATA2_PLUS | | | | | | | | |
DQ59 | DATA2_PLUS | | | | | | | | |
DATA2_BUS (20) | DATA2

why DQ0 to DQ3 have ECS of DATA2    and DQ4 to DQ7 have ECS of DATA2_PLUS?

alternating.


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