48SD1616RPFH datasheet(11/42 Pages) MAXWELL

Part #	48SD1616RPFH

Description	256 Mb SDRAM 4-Meg X 16-Bit X 4-Banks

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Manufacturer	MAXWELL [Maxwell Technologies]

Direct Link	http://www.maxwell.com

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48SD1616

11

All data sheets are subject to change without notice

256Mb (4-Meg X 16-Bit X 4-Banks) SDRAM

01.07.05 REV 4

CKE Truth Table

Note: H:V

IH L:VIL x VIH or VIL

Clock suspend mode entry: The SDRAM enters clock suspend mode from active mode by setting CKE to

Low. If a command is input in the clock suspend mode entry cycle, the command is valid. The clock suspend

mode change depending on the current status (1 clock before) as described below.

ACTIVE clock suspend: This suspend mode ignores inputs after the next clock by internally maintaining

the bank active status.

READ suspend and READ with Auto-precharge suspend: The data being output is held ( and continues

to be output).

WRITE suspend and WRIT with Auto-precharge suspended: In this mode, external signals are not

accepted. However, the internal state is held.

Clock suspend: During clock suspend mode, keep the CKE to Low.

Clock suspend mode exit: The SDRAM exits from clock suspend mode by setting CKE to High during the

clock suspend state.

IDLE: In this state, all banks are not selected, and have completed precharge operation.

Auto-refresh command (REF): When this command is input from the IDLE state, the SDRAM starts auto-

refresh operation. (The auto-refresh is the same as the CBR refresh of conventional DRAMs.) During the

auto-refresh operation, refresh address and bank select address are generated inside the SDRAM. For

every auto-refresh cycle, the internal address counter is updated. Accordingly, 8192 cycles are required to

refresh the entire memory contents. Before executing the auto-refresh command, all the banks must be in

CURRENT STATE

COMMAND

N

-1

N

CS

RAS

CAS

WE

ADDRESS

Active

Clock suspended mode entry

H

L

x

Any

Clock Suspend

L

x

Clock Suspend

Clock Suspend mode exit

L

H

x

Idle

Auto-refresh command (REF)

H

L

H

x

Idle

Self-refresh entry (SELF)

H

L

H

x

Idle

Power down entry

HL

LH

H

x

H

L

HL

xxx

x

Self Refresh

Self Refresh exit (SELFX)

L

H

L

H

x

Power down

Power down exit

LH

H

x

L

H

xxx

x

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48SD1616RPFH Datasheet(PDF) 11 Page - Maxwell Technologies

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