256Mb: x4, x8, x16 SDRAM
Features
Contents
General Description ......................................................................................................................................... 7
Automotive Temperature .............................................................................................................................. 7
Functional Block Diagrams ............................................................................................................................... 8
Pin and Ball Assignments and Descriptions ..................................................................................................... 11
Package Dimensions ....................................................................................................................................... 15
Temperature and Thermal Impedance ............................................................................................................ 19
Electrical Specifications .................................................................................................................................. 23
Electrical Specifications – IDD Parameters ........................................................................................................ 25
Electrical Specifications – AC Operating Conditions ......................................................................................... 27
Functional Description ................................................................................................................................... 30
Commands .................................................................................................................................................... 31
COMMAND INHIBIT .................................................................................................................................. 31
NO OPERATION (NOP) ............................................................................................................................... 32
LOAD MODE REGISTER (LMR) ................................................................................................................... 32
ACTIVE ...................................................................................................................................................... 32
READ ......................................................................................................................................................... 33
WRITE ....................................................................................................................................................... 34
PRECHARGE .............................................................................................................................................. 35
BURST TERMINATE ................................................................................................................................... 35
REFRESH ................................................................................................................................................... 36
AUTO REFRESH ..................................................................................................................................... 36
SELF REFRESH ....................................................................................................................................... 36
Truth Tables ................................................................................................................................................... 37
Initialization .................................................................................................................................................. 42
Mode Register ................................................................................................................................................ 44
Burst Length .............................................................................................................................................. 46
Burst Type .................................................................................................................................................. 46
CAS Latency ............................................................................................................................................... 48
Operating Mode ......................................................................................................................................... 48
Write Burst Mode ....................................................................................................................................... 48
Bank/Row Activation ...................................................................................................................................... 49
READ Operation ............................................................................................................................................. 50
WRITE Operation ........................................................................................................................................... 59
Burst Read/Single Write .............................................................................................................................. 66
PRECHARGE Operation .................................................................................................................................. 67
Auto Precharge ........................................................................................................................................... 67
AUTO REFRESH Operation ............................................................................................................................. 79
SELF REFRESH Operation ............................................................................................................................... 81
Power-Down .................................................................................................................................................. 83
Clock Suspend ............................................................................................................................................... 84
PDF: 09005aef8091e6d1
256Mb_sdr.pdf - Rev. R 10/12 EN
Micron Technology, Inc. reserves the right to change products or specifications without notice.
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MICRON [ MICRON TECHNOLOGY ]
