HYB18M1G320BF QIMONDA [Qimonda AG], HYB18M1G320BF Datasheet - Page 27

• Manufacturer Part Number: HYB18M1G320BF
• Description: DRAMs for Mobile Applications 1-Gbit x32 DDR Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

2.4.5.2
Data from any READ burst must be completed or truncated before a subsequent WRITE command can be issued. If truncation
is necessary, the BURST TERMINATE command must be used, as shown in
2.4.5.3
A READ burst may be followed by, or truncated with a PRECHARGE command to the same bank (provided that Auto
Precharge was not activated).
The PRECHARGE command should be issued x clock cycles after the READ command, where x equals the number of desired
data element pairs. This is shown in
bank cannot be issued until t
data elements.
In the case of a READ being executed to completion, a PRECHARGE command issued at the optimum time (as described
above) provides the same operation that would result from the same READ burst with Auto Precharge enabled. The
disadvantage of the PRECHARGE command is that it requires that the command and address busses be available at the
appropriate time to issue the command. The advantage of the PRECHARGE command is that it can be used to truncate bursts.
Rev.1.00, 2007-03
02022006-J7N7-GYFP
Command
Command
Address
Address
DO n = Data Out from column n; DI b = Data In to column b
1 subsequent element of Data Out appear in the programmed order following DO n.
Data In elements are applied following DI b in the programmed order
DQS
DQS
DM
DM
DQ
DQ
CK
CK
BA,Col n
BA,Col n
READ
READ
READ to WRITE
READ to PRECHARGE
RP
is met. Please note that part of the row precharge time is hidden during the access of the last
CL=2
Figure
BST
BST
19. Following the PRECHARGE command, a subsequent command to the same
CL=3
DO n
NOP
NOP
27
DO n
BA,Col b
WRITE
NOP
Figure
t
DQSS
18.
Di b
BA,Col b
WRITE
NOP
1-Gbit DDR Mobile-RAM
HY[B/E]18M1G320BF
Di b
READ to WRITE
FIGURE 18
= Don't Care
NOP
NOP
Data Sheet