EMC326SP16AJ

2Mx16 CellularRAM

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

Page Mode READ Operation ............................................................................................................................................ 11

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

Deep Power-Down Operation............................................................................................................................................. 16

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

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

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

Bus Configuration Register................................................................................................................................................. 22

Burst Length (BCR[2:0]) Default = Continuous Burst ..................................................................................................... 23

Burst Wrap (BCR[3]) Default = No Wrap ........................................................................................................................ 23

Drive Strength (BCR[5:4]) Default = Outputs Use Half-Drive Strength ........................................................................... 24

WAIT Configuration (BCR[8]) Default = WAIT Transitions One Clock Before Data Valid / Invalid................................... 24

WAIT Polarity (BCR[10]) Default = WAIT Active HIGH................................................................................................... 24

Latency Counter (BCR[13:11]) Default = Three Clock Latency .................................................................................... 25

Initial Access Latency (BCR[14]) Default = Variable....................................................................................................... 25

Operating Mode (BCR[15]) Default = Asynchronous Operation..................................................................................... 26

Refresh Configuration Register........................................................................................................................................... 27

Partial Array Refresh (RCR[2:0]) Default = Full Array Refresh ..................................................................................... 28

Deep Power-Down (RCR[4]) Default = DPD Disabled ................................................................................................... 28

Page Mode Operation (RCR[7]) Default = Disabled ...................................................................................................... 28

Device Identification Register.............................................................................................................................................. 28

Electrical Characteristics......................................................................................................................................................... 29

Timing Requirements.............................................................................................................................................................. 31

Timing Diagrams..................................................................................................................................................................... 35