M2S56D20TP データシートの表示（PDF） - Mitsumi

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M2S56D20TP

256M Double Data Rate Synchronous DRAM

Mitsumi 

DDR SDRAM (Rev.0.0)

Sep.'99 Preliminary

MITSUBISHI LSIs

M2S56D20/ 30 TP

256M Double Data Rate Synchronous DRAM

FUNCTION TRUTH TABLE for CKE

CKE CKE

Current State

/CS /RAS /CAS /WE Add

n-1 n

Action

Notes

SELF-

H X X X X X X INVALID

1

REFRESH

L H H X X X X Exit Self-Refresh (Idle after tRC)

1

L H L H H H X Exit Self-Refresh (Idle after tRC)

1

L H L H H L X ILLEGAL

1

L H L H L X X ILLEGAL

1

L H L L X X X ILLEGAL

1

L L X X X X X NOP (Maintain Self-Refresh)

1

POWER

DOWN

H X X X X X X INVALID

L H X X X X X Exit Power Down to Idle

L L X X X X X NOP (Maintain Self-Refresh)

ALL BANKS H H X X X X X Refer to Function Truth Table

2

IDLE

H L L L L H X Enter Self-Refresh

2

H L H X X X X Enter Power Down

2

H L L H H H X Enter Power Down

2

H L L H H L X ILLEGAL

2

H L L H L X X ILLEGAL

2

H L L L X X X ILLEGAL

2

L X X X X X X Refer to Current State =Power Down 2

ANY STATE H H X X X X X Refer to Function Truth Table

other than

H L X X X X X Begin CLK Suspend at Next Cycle

3

listed above L H X X X X X Exit CLK Suspend at Next Cycle

3

L L X X X X X Maintain CLK Suspend

ABBREVIATIONS:

H=High Level, L=Low Level, X=Don't Care

NOTES:

1. CKE Low to High transition will re-enable CLK and other inputs asynchronously. A minimum setup time must be

satisfied before any command other than EXIT.

2. Power-Down and Self-Refresh can be entered only from the All Banks Idle State.

3. Must be legal command.

MITSUBISHI

ELECTRIC

11

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