Data Sheet
HY[B/E]18M1G16[0/1]BF
1-Gbit DDR Mobile-RAM
2.4.7.1
WRITE to READ
Data for any WRITE burst may be followed by a subsequent READ command. To follow a WRITE without truncating the WRITE
burst, tWTR (WRITE to READ) should be met as shown in Figure 28.
FIGURE 28
Non-Interrupting WRITE to READ (max. tDQSS
)
CK
CK
Command
WRITE
NOP
NOP
NOP
READ
NOP
NOP
Address
BA,Col b
BA,Col n
tDQSSmax
tWTR
CL=3
DQS
DQ
Di b
DM
DI b = Data In to column b .
3 subsequent elements of Data In are applied in the programmed order following DI b.
A non-interrupted burst of 4 is shown.
= Don't Care
tWTR is referenced from the positive clock edge after the last Data In pair.
A10 is LOW with the WRITE command (Auto Precharge is disabled)
The READ and WRITE commands are to the same device but not necessarily to the same bank.
Data for any WRITE burst may be truncated by a subsequent READ command, as shown in Figure 29. Note that only the data-
in pairs that are registered prior to the tWTR period are written to the internal array, and any subsequent data-in must be masked
with DM, as shown in Figure 29.
Rev.1.0, 2007-03
37
10242006-Y557-TZXW
QIMONDA [ QIMONDA AG ]
