Rev. 1.7 /Sep. 2011

19

a) DM must be driven LOW all the time. DQS, DQS are used according to RD Commands, otherwise MID-LEVEL.

b) Burst Sequence driven on each DQ signal by Read Command. Outside burst operation, DQ signals are MID-LEVEL.

0

0

ACT

0

0

1

1

0

0

00

0

0

0

0

-

1,2

D, D

1

0

0

0

0

0

00

0

0

0

0

-

3,4

D, D

11

1

1

0

0

00

0

0

0

0

-

...

repeat pattern 1...4 until nRCD - 1, truncate if necessary

nRCD

RD

0

1

0

1

0

0

00

0

0

0

0

00000000

...

repeat pattern 1...4 until nRAS - 1, truncate if necessary

nRAS

PRE

0

0

1

0

0

0

00

0

0

0

0

-

...

repeat pattern 1...4 until nRC - 1, truncate if necessary

1*nRC+0

ACT

0

0

1

1

0

0

00

0

0

F

0

-

1*nRC+1,2

D, D

1

0

0

0

0

0

00

0

0

F

0

-

1*nRC+3,4

D, D

11

1

1

0

0

00

0

0

F

0

-

...

repeat pattern nRC + 1,...4 until nRC + nRCD - 1, truncate if necessary

1*nRC+nRCD

RD

0

1

0

1

0

0

00

0

0

F

0

00110011

...

repeat pattern nRC + 1,...4 until nRC + nRAS - 1, truncate if necessary

1*nRC+nRAS

PRE

0

0

1

0

0

0

00

0

0

F

0

-

...

repeat pattern nRC + 1,...4 until 2* nRC - 1, truncate if necessary

1 2*nRC

repeat Sub-Loop 0, use BA[2:0] = 1 instead

2 4*nRC

repeat Sub-Loop 0, use BA[2:0] = 2 instead

3 6*nRC

repeat Sub-Loop 0, use BA[2:0] = 3 instead

4 8*nRC

repeat Sub-Loop 0, use BA[2:0] = 4 instead

5 10*nRC

repeat Sub-Loop 0, use BA[2:0] = 5 instead

6 12*nRC

repeat Sub-Loop 0, use BA[2:0] = 6 instead

7 14*nRC

repeat Sub-Loop 0, use BA[2:0] = 7 instead