Preliminary Data Sheet M17507EJ2V0DS 7
μ
PD46128512-X
CONTENTS
1. Initialization .................................................................................................................................................. 9
2. Partial Refresh ........................................................................................................................................... 11
2.1 Standby Mode.......................................................................................................................................................... 11
2.2 Density Switching .................................................................................................................................................... 11
2.3 Standby Mode Status Transition.............................................................................................................................. 11
2.4 Addresses for Which Partial Refresh Is Supported.................................................................................................. 13
3. Page Read Operation ................................................................................................................................ 14
3.1 Features of Page Read Operation ........................................................................................................................... 14
3.2 Page Length ............................................................................................................................................................ 14
3.3 Page-Corresponding Addresses.............................................................................................................................. 14
3.4 Page Start Address.................................................................................................................................................. 14
3.5 Page Direction ......................................................................................................................................................... 14
3.6 Interrupt during Page Read Operation..................................................................................................................... 14
3.7 When Page Read is not Used.................................................................................................................................. 14
4. Burst Operation ......................................................................................................................................... 15
4.1 Features of Burst Operation .................................................................................................................................... 15
4.2 Burst Length ............................................................................................................................................................ 15
4.3 Latency .................................................................................................................................................................... 15
4.4 Single Write ............................................................................................................................................................. 17
4.5 /WE Control ............................................................................................................................................................. 17
4.6 Burst Read Suspend/Resume ................................................................................................................................. 18
4.7 Burst Write Suspend/Resume ................................................................................................................................. 19
4.8 Burst Read Termination........................................................................................................................................... 20
4.9 Burst Write Termination ........................................................................................................................................... 21
4.10 /WAIT..................................................................................................................................................................... 22
4.10.1 Feature of /WAIT Output ............................................................................................................................. 22
4.10.2 Dummy Wait Cycles at Continuous Burst Operation ................................................................................... 25
4.11 Reset Function from Synchronous Burst Mode to Asynchronous Page Mode....................................................... 27
5. Mode Register Settings............................................................................................................................. 28
5.1 Mode Register Setting Method ................................................................................................................................ 28
5.2 Cautions for Setting Mode Register ......................................................................................................................... 28
5.3 Partial Refresh Density ............................................................................................................................................ 30
5.4 Burst Length ............................................................................................................................................................ 30
5.5 Function Mode......................................................................................................................................................... 30
5.6 Valid Clock Edge ..................................................................................................................................................... 30
5.7 Read Latency (Write Latency) ................................................................................................................................. 30
5.8 Single Write ............................................................................................................................................................. 30
5.9 /WE Control ............................................................................................................................................................. 31
5.10 Reset to Page Mode .............................................................................................................................................. 31
5.11 Reserved Bits ........................................................................................................................................................ 31
5.12 Cautions for Timing Chart of Setting Mode Register.............................................................................................. 32
6. Electrical Specifications ........................................................................................................................... 33