HYB18M1G320BF Datasheet, PDF (24/62 Pages) Qimonda AG – DRAMs for Mobile Applications 1-Gbit x32 DDR Mobile-RAM

Data Sheet
HY[B/E]18M1G320BF
1-Gbit DDR Mobile-RAM
Data from any READ burst may be concatenated with or truncated with data from a subsequent READ command. In either
case, a continuous flow of data can be maintained. The first data element from the new burst follows either the last element of
a completed burst or the last desired data element of a longer burst which is being truncated.
The new READ command should be issued x cycles after the first READ command, where x equals the number of desired data
element pairs (pairs are required by the 2n pre fetch architecture). This is shown in Figure 14.
FIGURE 14
Consecutive READ Bursts
CK
CK
Command
READ
NOP
READ
NOP
NOP
NOP
Address BA,Col n
DQS
CL=2
BA,Col b
DQ
DO n
DO b
DQS
CL=3
DQ
DO n
DO b
DO n (or b) = Data Out from column n (or column b)
= Don't Care
Burst Length = 4, 8 or 16 (if 4, the bursts are concatenated; if 8 or 16, the second burst interrupts the first)
3 subsequent elements of Data Out appear in the programmed order following DO n
3 (or 7 or 15) subsequent elements of Data Out appear in the programmed order following DO b
Read commands shown must be to the same device
A READ command can be initiated on any clock cycle following a previous READ command. Nonconsecutive READ data is
illustrated in Figure 15.
Rev.1.00, 2007-03
24
02022006-J7N7-GYFP