參數(shù)資料
型號: HYB18L256160B
廠商: QIMONDA
英文描述: DRAMs for Mobile Applications 256-Mbit Mobile-RAM
中文描述: DRAM的針對移動應用256兆移動RAM
文件頁數(shù): 26/58頁
文件大?。?/td> 1766K
代理商: HYB18L256160B
Data Sheet
Rev. 1.73, 2006-09
01302004-CZ2R-J9SE
26
HY[B/E]18L256160B[C/F]L-7.5
256-Mbit Mobile-RAM
2.4.5.4
READ to WRITE
A READ burst may be followed by or truncated with a WRITE command. The WRITE command can be performed to the same
or a different (active) bank. Care must be taken to avoid bus contention on the DQs; therefore it is recommended that the DQs
are held in High-Z state for a minimum of 1 clock cycle. This can be achieved by either delaying the WRITE command, or
suppressing the data-out from the READ by pulling DQM HIGH two clock cycles prior to the WRITE command, as shown in
Figure 21
. With the registration of the WRITE command, DQM acts as a write mask: when asserted HIGH, input data will be
masked and no write will be performed.
FIGURE 21
READ to WRITE Timing
%D $ &RO Q E EDQN $ FROXPQ Q E
'2 Q 'DWD 2XW IURP FROXPQ Q ', E 'DWD ,Q WR FROXPQ E
'40 LV DVVHUWHG +,*+ WR VHW '4V WR +LJK = VWDWH IRU
FORFN F\FOH SULRU WR WKH :5,7( FRPPDQG
'RQW &DUH
&/.
&/
&/
&RPPDQG
123
5($'
123
123
123
123
123
:5,7(
$G GUHVV
&RO E
&RO Q
'40
'4
'2 Q
', E
' , E
'2 Q
+LJK =
', E
'4
', E
' , E
'2 Q
+LJK =
', E
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