EDB8164B4PR-1DATF-R datasheet(44/152 Pages) MICRON

44 / 152 page

cycle time of the device (tRC). The minimum time interval between ACTIVATE com-

mands to different banks is tRRD.

Figure 15: ACTIVATE Command

Bankn

row addr

Row addr

ACTIVATE

NOP

ACTIVATE

READ

PRECHARGE

ACTIVATE

NOP

Bankm

row addr

Row addr

Bankn

col addr

Col addr

Bankn

row addr

Row addr

Tn+1

Tn+2

Tn+3

CK_c

CK_t

CA[9:0]

CMD

tRRD

tRCD

tRC

tRAS

tRP

Notes:

1. tRCD = 3, tRP = 3, tRRD = 2.

2. A PRECHARGE ALL command uses tRPab timing, and a single-bank PRECHARGE com-

mand uses tRPpb timing. In this figure, tRP is used to denote either an all-bank PRE-

CHARGE or a single-bank PRECHARGE.

8-Bank Device Operation

Two rules regarding 8-bank device operation must be observed: One rule restricts the

number of sequential ACTIVATE commands that can be issued; the second rule pro-

vides additional RAS precharge time for a PRECHARGE ALL command.

The 8-Bank Device Sequential Bank Activation Restriction: No more than four banks

can be activated (or refreshed, in the case of REFpb) in a rolling tFAW window. To con-

vert to clocks, divide tFAW[ns] by tCK[ns], and round up to the next integer value. For

example, if RU(tFAW/tCK) is 10 clocks, and an ACTIVATE command is issued in clock n,

no more than three further ACTIVATE commands can be issued at or between clock

n + 1 and n + 9. REFpb also counts as bank activation for purposes of tFAW.

The 8-Bank Device PRECHARGE ALL Provision: tRP for a PRECHARGE ALL command

must equal tRPab, which is greater than tRPpb.

216-Ball and 220-Ball, Dual-Channel LPDDR2 SDRAM

ACTIVATE Command

09005aef85eb530a

216b_220b_2ch_2e0e_embedded_lpddr2.pdf – Rev. F 08 /16 EN

Micron Technology, Inc. reserves the right to change products or specifications without notice.

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