HYB18L256169BF QIMONDA [Qimonda AG], HYB18L256169BF Datasheet - Page 34

• Manufacturer Part Number: HYB18L256169BF
• Description: 256-Mbit Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

2.4.9
The Mobile-RAM requires a refresh of all rows in a rolling interval. Each refresh is generated in one of two ways:
by an explicit AUTO REFRESH command, or by an internally timed event in SELF REFRESH mode.
2.4.9.1
Figure 41
Figure 42
Data Sheet
AUTO REFRESH and SELF REFRESH
AUTO REFRESH
AUTO REFRESH Command
Auto Refresh
34
Auto Refresh is used during normal operation of the
Mobile-RAM. The command is non persistent, so it
must be issued each time a refresh is required. A
minimum row cycle time (
AUTO REFRESH commands. The same rule applies to
any access command after the auto refresh operation.
All banks must be precharged prior to the AUTO
REFRESH command.
The refresh addressing is generated by the internal
refresh controller. This makes the address bits “Don’t
Care” during an AUTO REFRESH command. The
Mobile-RAM requires AUTO REFRESH cycles at an
average periodic interval of 7.8 µs (max.). Partial array
mode has no influence on auto refresh mode.
HY[B/E]18L256169BF-7.5
t
RC
256-Mbit Mobile-RAM
) is required between two
Functional Description
02032006-MP0M-7FQG
Rev. 1.02, 2006-12