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2Gb: x16, x32 Mobile LPDDR2 SDRAM S4
Mode Register Definition
Table 22: MR4 Op-Code Bit Definitions
Notes 1–8 apply to all parameters and conditions
Feature
SDRAM refresh
rate
Type
Read-only
OP
OP[2:0]
Definition
000b: SDRAM low temperature operating limit exceeded
001b: 4 × t REFI, 4 × t REFIpb, 4 × t REFW
010b: 2 × t REFI, 2 × t REFIpb, 2 × t REFW
011b: 1 × t REFI, 1 × t REFIpb, 1 × t REFW ( ≤ 85?C)
100b: Reserved
101b: 0.25 × t REFI, 0.25 × t REFIpb, 0.25 × t REFW, do not derate SDRAM AC
timing
110b: 0.25 × t REFI, 0.25 × t REFIpb, 0.25 × t REFW, 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.
2.
3.
4.
5.
6.
A MODE REGISTER READ from MR4 will reset OP7 to 0.
OP7 is reset to 0 at power-up.
If OP2 = 1, the device temperature is greater than 85?C.
OP7 is set to 1 if OP[2:0] has changed at any time since the last MR4 read.
The device might not operate properly when OP[2:0] = 000b or 111b.
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: t RCD, t RC, t RAS, t RP, and t RRD. The t DQSCK 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
(page 87).
Table 23: MR5 Basic Configuration 1 (MA[7:0] = 05h)
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
LPDDR2 Manufacturer ID
Table 24: MR5 Op-Code Bit Definitions
Feature
Manufacturer ID
Type
Read-only
OP
OP[7:0]
Definition
1111 1111b: Micron
All others: Reserved
Table 25: MR6 Basic Configuration 2 (MA[7:0] = 06h)
OP7
OP6
OP5
OP4
OP3
OP2
OP1
OP0
Revision ID1
Note:
1. MR6 is vendor-specific.
PDF: 09005aef83f3f2eb
2gb_mobile_lpddr2_s4_g69a.pdf – Rev. N 3/12 EN
49
Micron Technology, Inc. reserves the right to change products or specifications without notice.
2010 Micron Technology, Inc. All rights reserved.
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