KM416RD8AS-RBM80 datasheet(15/64 Pages) SAMSUNG

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Page 12

KM416RD8AS

Direct RDRAM™

Rev. 0.9 July 1999

Target

ROW-to-ROW Packet Interaction

Figure 6 shows two packets on the ROW pins separated by

an interval tRRDELAY which depends upon the packet

contents. No other ROW packets are sent to banks

{Ba,Ba+1,Ba-1} between packet “a” and packet “b” unless

noted otherwise. Table 10 summarizes the tRRDELAY values

for all possible cases.

Cases RR1 through RR4 show two successive ACT

commands. In case RR1, there is no restriction since the

ACT commands are to different devices. In case RR2, the

tRR restriction applies to the same device with non-adjacent

banks. Cases RR3 and RR4 are illegal (as shown) since bank

Ba needs to be precharged. If a PRER to Ba, Ba+1, or Ba-1

is inserted, tRRDELAY is tRC (tRAS to the PRER command,

and tRP to the next ACT).

Cases RR5 through RR8 show an ACT command followed

by a PRER command. In cases RR5 and RR6, there are no

restrictions since the commands are to different devices or to

non-adjacent banks of the same device. In cases RR7 and

RR8, the tRAS restriction means the activated bank must wait

before it can be precharged.

Cases RR9 through RR12 show a PRER command followed

by an ACT command. In cases RR9 and RR10, there are

essentially no restrictions since the commands are to

different devices or to non-adjacent banks of the same

device. RR10a and RR10b depend upon whether a bracketed

bank (Ba+-1) is precharged or activated. In cases RR11 and

RR12, the same and adjacent banks must all wait tRP for the

sense amp and bank to precharge before being activated.

Figure 6: ROW-to-ROW Packet Interaction- Timing

CTM/CFM

DQA7..0

DQB7..0

COL4

..COL0

ROW2

..ROW0

T12

T13

T10

T14

T11

T15 T16

T17 T18 T19

Transaction a: ROPa

Transaction b: ROPb

a0 = {Da,Ba,Ra}

b0= {Db,Bb,Rb}

tRRDELAY

ROPa a0

ROPb b0

Table 10: ROW-to-ROW Packet Interaction - Rules

Case #

ROPa

ROPb

tRRDELAY

Example

RR1

ACT

/= Da

xxxx

x..x

tPACKET

Figure 11

RR2

ACT

== Da

/= {Ba,Ba+1,Ba-1}

x..x

tRR

Figure 11

RR3

ACT

== Da

== {Ba+1,Ba-1}

x..x

tRC - illegal unless PRER to Ba/Ba+1/Ba-1

Figure 10

RR4

ACT

== Da

== {Ba}

x..x

tRC - illegal unless PRER to Ba/Ba+1/Ba-1

Figure 10

RR5

ACT

PRER

/= Da

xxxx

x..x

tPACKET

Figure 11

RR6

ACT

PRER

== Da

/= {Ba,Ba+1,Ba-1}

x..x

tPACKET

Figure 11

RR7

ACT

PRER

== Da

== { Ba+1,Ba-1}

x..x

tRAS

Figure 10

RR8

ACT

PRER

== Da

== {Ba}

x..x

tRAS

Figure 15

RR9

PRER

ACT

/= Da

xxxx

x..x

tPACKET

Figure 12

RR10

PRER

ACT

== Da

/= {Ba,Ba+-1,Ba+-2}

x..x

tPACKET

Figure 12

RR10a

PRER

ACT

== Da

== {Ba+2}

x..x

tPACKET/tRP if Ba+1 is precharged/activated.

RR10b

PRER

ACT

== Da

== {Ba-2}

x..x

tPACKET/tRP if Ba-1 is precharged/activated.

RR11

PRER

ACT

== Da

== {Ba+1,Ba-1}

x..x

tRP

Figure 10

RR12

PRER

ACT

== Da

== {Ba}

x..x

tRP

Figure 10

RR13

PRER

/= Da

xxxx

x..x

tPACKET

Figure 12

RR14

PRER

== Da

/= {Ba,Ba+1,Ba-1}

x..x

tPP

Figure 12

RR15

PRER

== Da

== {Ba+1,Ba-1}

x..x

tPP

Figure 12

RR16

PRER

== Da

== Ba

x..x

tPP

Figure 12

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