MB81EDS516445 Datasheet, PDF (7/52 Pages) Fujitsu Component Limited. – 512M Bit (4 bank x 2M word x 64 bit) Consumer Applications Specific Memory for SiP

MB81EDS516445
■ FUNCTIONAL DESCRIPTION
1. Power Up Initialization
This device internal condition after power-up will be undefined. The following Power up initialization sequence
must be performed to start proper device operation.
1. Apply power (VDD should be applied before or in parallel with VDDQ) and start clock. Attempt to maintain
either NOP or DESL command at the input.
2. Maintain stable power, stable clock, and NOP or DESL condition for a minimum of 300 μs.
3. Precharge all banks by PRECHARGE (PRE) or PRECHARGE ALL (PALL) command.
4. Assert minimum of 2 AUTO REFRESH (REF) commands.
5. Program the Mode Register by MODE REGISTER SET (MRS) command.
6. Program the Extended Mode Register by MODE REGISTER SET (MRS) command.
In addition, CKE must be High to ensure that output is High-Z state. The Mode Register and Extended Mode
Register can be set before 2 Auto-refresh commands (REF).
2. Mode Register
The Mode Register is used to configure the type of device function among optional features. This device has 2
Mode Registers, Mode Register and Extended Mode Register. Mode Registers can be programmed by MODE
REGISER SET (MRS) command. Refer to the “Mode Register Table” in “■ FUNCTIONAL DESCRIPTION”.
DS05-11464-1E
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