KM416RD8AS-RBM80 datasheet(19/64 Pages) SAMSUNG

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Page 16

KM416RD8AS

Direct RDRAM™

Rev. 0.9 July 1999

Target

ROW-to-ROW Examples

Figure 10 shows examples of some of the ROW-to-ROW

packet spacings from Table 10. A complete sequence of acti-

vate and precharge commands is directed to a bank. The

RR8 and RR12 rules apply to this sequence. In addition to

satisfying the tRAS and tRP timing parameters, the separation

between ACT commands to the same bank must also satisfy

the tRC timing parameter (RR4).

When a bank is activated, it is necessary for adjacent banks

to remain precharged. As a result, the adjacent banks will

also satisfy parallel timing constraints; in the example, the

RR11 and RR3 rules are analogous to the RR12 and RR4

rules.

Figure 11 shows examples of the ACT-to-ACT (RR1, RR2)

and ACT-to-PRER (RR5, RR6) command spacings from

Table 10. In general, the commands in ROW packets may be

spaced an interval tPACKET apart unless they are directed to

the same or adjacent banks or unless they are a similar

command type (both PRER or both ACT) directed to the

same device.

Figure 10: Row Packet Example

CTM/CFM

DQA7..0

DQB7..0

COL4

..COL0

ROW2

..ROW0

T12

T13

T10

T14

T11

T15 T16

T20

T24

T28

T17

T21

T25

T29

T18

T22

T26

T30

T19

T23

T27

T31 T32

T36

T40

T44

T33

T37

T41

T45

T34

T38

T42

T46

T35

T39

T43

T47

ACT a0

PRER a1

tRAS

tRC

a0 = {Da,Ba,Ra}

a1 = {Da,Ba+1}

b0 = {Da,Ba+1,Rb}

Same Device

Adjacent Bank

RR7

tRP

Same Device

Adjacent Bank

RR11

ACT b0

b0 = {Da,Ba,Rb}

Same Device

Same Bank

RR12

b0 = {Da,Ba+1,Rb}

Same Device

Adjacent Bank

RR3

b0 = {Da,Ba,Rb}

Same Device

Same Bank

RR4

Figure 11: Row Packet Example

CTM/CFM

DQA7..0

DQB7..0

COL4

..COL0

ROW2

..ROW0

T12

T13

T10

T14

T11

T15 T16

T20

T24

T28

T17

T21

T25

T29

T18

T22

T26

T30

T19

T23

T27

T31 T32

T36

T40

T44

T33

T37

T41

T45

T34

T38

T42

T46

T35

T39

T43

T47

ACT a0

PRER b0

tPACKET

ACT c0

tRR

a0 = {Da,Ba,Ra}

b0 = {Db,Bb,Rb}

c0 = {Da,Bc,Rc}

Different Device

Any Bank

Same Device

Non-adjacent Bank

RR1

RR2

ACT a0

ACT b0

PRER c0

b0 = {Db,Bb,Rb}

c0 = {Da,Bc,Rc}

Different Device

Any Bank

Same Device

Non-adjacent Bank

RR5

RR6

ACT a0

tPACKET

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