HYB18T512400AF Datasheet, PDF (75/117 Pages) Infineon Technologies AG – 512-Mbit DDR2 SDRAM

4
Truth tables
HYB18T512[40/80/16]0AF–[3/3S/3.7/5]
512-Mbit DDR2 SDRAM
Truth tables
Table 20 Command Truth Table
Function
CKE
CS RAS CAS WE BA0 A[12:11] A10 A[9:0]
Previous Current
BA1
Cycle Cycle
Note¹⁾²⁾³⁾
(Extended) Mode
H
H
L L L L BA OP Code
4)5)
Register Set
Auto-Refresh
H
H
LL L H X X
XX
4)
Self-Refresh Entry
H
L
LL L H X X
XX
4)6)
Self-Refresh Exit
L
H
HX X X X X
XX
4)6)7)
LH H H
Single Bank Precharge H
H
L L H L BA X
LX
4)5)
Precharge all Banks H
H
LL H L X X
HX
4)
Bank Activate
H
H
L L H H BA Row Address
4)5)
Write
H
H
LH
L
L BA Column L Column ⁴⁾⁵⁾⁸⁾
Write with Auto-
H
Precharge
H
LH
L
L BA Column H Column ⁴⁾⁵⁾⁸⁾
Read
H
H
LH
L
H BA Column L Column ⁴⁾⁵⁾⁸⁾
Read with Auto-
H
Precharge
H
LH
L
H BA Column H Column ⁴⁾⁵⁾⁸⁾
No Operation
H
X
LH H H X X
XX
4)
Device Deselect
H
X
HX X X X X
XX
4)
Power Down Entry
H
L
HX X X X X
XX
4)9)
LH H H
Power Down Exit
L
H
HX X X X X
XX
4)9)
LH H H
1) The state of ODT does not affect the states described in this table. The ODT function is not available during Self Refresh.
2) “X” means “H or L (but a defined logic level)”.
3) Operation that is not specified is illegal and after such an event, in order to guarantee proper operation, the DRAM must
be powered down and then restarted through the specified initialization sequence before normal operation can continue.
4) All DDR2 SDRAM commands are defined by states of CS, WE, RAS, CAS, and CKE at the rising edge of the clock.
5) Bank addresses (BAx) determine which bank is to be operated upon. For (E)MRS BA[1:0] selects an (Extended) Mode
Register.
6) V_REF must be maintained during Self Refresh operation.
7) Self Refresh Exit is asynchronous.
8) Burst reads or writes at BL = 4 cannot be terminated. See Chapter 3.21 for details.
9) The Power Down Mode does not perform any refresh operations. The duration of Power Down is therefore limited by the
refresh requirements outlined in Chapter 3.24
Data Sheet
75
Rev. 1.3, 2005-01
09112003-SDM9-IQ3P