EDBA164B4PR-1DATF-R datasheet(99/152 Pages) MICRON

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Resetting MR reading: Starts with registration of the MRR command and ends when

tMRR is met. After tMRR is met, the device is in the all banks idle state.

Active MR reading: Starts with registration of the MRR command and ends when tMRR

is met. After tMRR is met, the bank is in the active state.

MR writing: Starts with registration of the MRW command and ends when tMRW is met.

After tMRW is met, the device is in the all banks idle state.

Precharging all: Starts with registration of a PRECHARGE ALL command and ends when

tRP is met. After tRP is met, the device is in the all banks idle state.

6. Bank-specific; requires that the bank is idle and no bursts are in progress.

7. Not bank-specific; requires that all banks are idle and no bursts are in progress.

8. Not bank-specific.

9. This command may or may not be bank specific. If all banks are being precharged, they

must be in a valid state for precharging.

10. If a PRECHARGE command is issued to a bank in the idle state, tRP still applies.

11. A command other than NOP should not be issued to the same bank while a burst READ

or burst WRITE with auto precharge is enabled.

12. The new READ or WRITE command could be auto precharge enabled or auto precharge

disabled.

13. A WRITE command can be issued after the completion of the READ burst; otherwise, a

BST must be issued to end the READ prior to asserting a WRITE command.

14. Not bank-specific. The BST command affects the most recent READ/WRITE burst started

by the most recent READ/WRITE command, regardless of bank.

15. A READ command can be issued after completion of the WRITE burst; otherwise, a BST

must be used to end the WRITE prior to asserting another READ command.

Table 57: Current State Bank n to Command to Bank m Truth Table

Notes 1–6 apply to all parameters and conditions

Current State

of Bank n

Command to Bank m Operation

Next State for Bank m

Notes

Any

NOP

Continue previous operation

Current state of bank m

Idle

Any

Any command supported to bank m

–7

Row activating,

active, or pre-

charging

ACTIVATE

Select and activate row in bank m

Active

READ

Select column and start READ burst

from bank m

Reading

WRITE

Select column and start WRITE burst to

bank m

Writing

PRECHARGE

Deactivate row(s) in bank or banks

Precharging

MRR

READ value from mode register

Idle MR reading or active

MR reading

11, 12, 13

BST

READ or WRITE burst terminates an on-

going READ/WRITE from/to bank m

Active

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

Truth Tables

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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