EDBA164B4PT-1DATF-R datasheet(65/152 Pages) MICRON

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tRRD has been satisfied after the prior ACTIVATE command (when applicable, for ex-

ample after activating a row in a different bank than the one affected by the REFpb

command)

The target bank is inaccessible during per-bank REFRESH cycle time (tRFCpb); howev-

er, other banks within the device are accessible and can be addressed during the cycle.

During the REFpb operation, any of the banks other than the one being refreshed can

be maintained in an active state or accessed by a READ or WRITE command.

When the per-bank REFRESH cycle has completed, the affected bank will be in the idle

state.

After issuing REFpb, the following conditions must be met:

• tRFCpb must be satisfied before issuing a REFab command

• tRFCpb must be satisfied before issuing an ACTIVATE command to the same bank

• tRRD must be satisfied before issuing an ACTIVATE command to a different bank

• tRFCpb must be satisfied before issuing another REFpb command

An all-bank REFRESH command (REFab) issues a REFRESH command to all banks. All

banks must be idle when REFab is issued (for instance, by issuing a PRECHARGE ALL

command prior to issuing an all-bank REFRESH command). REFab also synchronizes

the bank count between the controller and the SDRAM to zero. The REFab command

must not be issued to the device until the following conditions have been met:

• tRFCab has been satisfied following the prior REFab command

• tRFCpb has been satisfied following the prior REFpb command

• tRP has been satisfied following the prior PRECHARGE commands

After an all-bank REFRESH cycle has completed, all banks will be idle. After issuing RE-

Fab:

• tRFCab latency must be satisfied before issuing an ACTIVATE command

• tRFCab latency must be satisfied before issuing a REFab or REFpb command

Table 49: REFRESH Command Scheduling Separation Requirements

Symbol

Minimum

Delay From

Notes

tRFCab

REFab

ACTIVATE command to any bank

REFpb

tRFCpb

REFpb

REFab

ACTIVATE command to same bank as REFpb

REFpb

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

REFRESH 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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