EMC646SP16K

4Mx16 CellularRAM AD-MUX

3

Preliminary

Table of Contents

Features.............................................................................................................................................................................................. 2

Options........................................................................................................................................................................................... 2

General Description............................................................................................................................................................................ 6

Functional Description........................................................................................................................................................................ 9

Power-Up Initialization.................................................................................................................................................................... 9

Bus Operating Modes......................................................................................................................................................................... 10

Asynchronous Mode....................................................................................................................................................................... 10

Burst Mode Operation.................................................................................................................................................................... 12

Mixed-Mode Operation .................................................................................................................................................................. 15

WAIT Operation ............................................................................................................................................................................. 15

LB# / UB# Operation...................................................................................................................................................................... 15

Low-Power Operation......... ............................................................................................................................................................... 16

Standby Mode Operation ............................................................................................................................................................... 16

Temperature Compensated Refresh.............................................................................................................................................. 16

Partial Array Refresh ..................................................................................................................................................................... 16

Registers............................................................................................................................................................................................. 17

Access Using CRE ........................................................................................................................................................................ 17

Software Access ............................................................................................................................................................................ 21

Bus Configuration Register............................................................................................................................................................. 23

Burst Length (BCR[2:0]) Default = Continuous Burst ................................................................................................................ 24

Burst Wrap (BCR[3]) Default = No Wrap ................................................................................................................................... 24

Drive Strength (BCR[5:4]) Default = Outputs Use Half-Drive Strength ...................................................................................... 25

WAIT Polarity (BCR[10]) Default = WAIT Active HIGH.............................................................................................................. 26

Initial Access Latency (BCR[14]) Default = Variable.................................................................................................................. 26

Operating Mode (BCR[15]) Default = Asynchronous Operation................................................................................................ 28

Refresh Configuration Register...................................................................................................................................................... 28

Device Identification Register......................................................................................................................................................... 29

Electrical Characteristics.................................................................................................................................................................... 30

Timing Requirements.......................................................................................................................................................................... 32

Timing Diagrams................................................................................................................................................................................. 36