EDBA164B4PR-1DITF-R datasheet(37/152 Pages) MICRON

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Table 24: MR4 Op-Code Bit Definitions

Notes 1–8 apply to all parameters and conditions

Feature

Type

Definition

SDRAM refresh

rate

Read-only

OP[2:0]

000b: SDRAM low temperature operating limit exceeded

001b: 4 × tREFI, 4 × tREFIpb, 4 × tREFW

010b: 2 × tREFI, 2 × tREFIpb, 2 × tREFW

011b: 1 × tREFI, 1 × tREFIpb, 1 × tREFW (

≤85˚C)

100b: Reserved

101b: 0.25 × tREFI, 0.25 × tREFIpb, 0.25 × tREFW, do not derate SDRAM AC

timing

110b: 0.25 × tREFI, 0.25 × tREFIpb, 0.25 × tREFW, derate SDRAM AC timing

111b: SDRAM high temperature operating limit exceeded

Temperature up-

date flag (TUF)

Read-only

OP7

0b: OP[2:0] value has not changed since last read of MR4

1b: OP[2:0] value has changed since last read of MR4

Notes:

1. A MODE REGISTER READ from MR4 will reset OP7 to 0.

2. OP7 is reset to 0 at power-up.

3. If OP2 = 1, the device temperature is greater than 85˚C.

4. OP7 is set to 1 if OP[2:0] has changed at any time since the last MR4 read.

5. The device might not operate properly when OP[2:0] = 000b or 111b.

6. For specified operating temperature range and maximum operating temperature, refer

to the Operating Temperature Range table.

7. LPDDR2 devices must be derated by adding 1.875ns to the following core timing param-

eters: tRCD, tRC, tRAS, tRP, and tRRD. The tDQSCK parameter must be derated as speci-

fied in AC Timing. Prevailing clock frequency specifications and related setup and hold

timings remain unchanged.

8. The recommended frequency for reading MR4 is provided in Temperature Sensor.

Table 25: MR5 Basic Configuration 1 (MA[7:0] = 05h)

OP7

OP6

OP5

OP4

OP3

OP2

OP1

OP0

LPDDR2 Manufacturer ID

Table 26: MR5 Op-Code Bit Definitions

Feature

Type

Definition

Manufacturer ID

Read-only

OP[7:0]

00000011b

All others: Reserved

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

Mode Register Definition

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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