參數(shù)資料
型號: GE28F640W30TD70
廠商: INTEL CORP
元件分類: PROM
英文描述: 4M X 16 FLASH 1.8V PROM, 70 ns, PBGA56
封裝: 0.75 MM PITCH, VFBGA-56
文件頁數(shù): 90/104頁
文件大?。?/td> 1443K
代理商: GE28F640W30TD70
28F640W30, 28F320W30, 28F128W30
June 2005
Intel Wireless Flash Memory (W30)
Datasheet
86
Order Number: 290702, Revision: 011
14.5
Data Hold (RCR[9])
The Data Output Configuration (DOC) bit (RCR[9]) determines whether a data word remains valid
on the data bus for one or two clock cycles. The minimum data set-up time on the processor, and
the flash memory clock-to-data output delay, determine whether one or two clocks are needed.
A DOC set at 1-clock data hold corresponds to a 1-clock data cycle.
A DOC set at 2-clock data hold corresponds to a 2-clock data cycle.
The setting of this configuration bit depends on the system and CPU characteristics. For
clarification, see Figure 41. The following is a method for determining this configuration setting.
To set the flash device at 1-clock data hold for subsequent reads, the following condition must be
satisfied:
tCHQV (ns) + tDATA (ns) < One CLK Period (ns)
As an example, use a clock frequency of 54 MHz and a clock period of 25 ns. Assume the data
output hold time is one clock. Apply this data to the formula above for the subsequent reads:
20 ns + 4 ns
25 ns
This equation is satisfied, and data output is available and valid at every clock period. If tDATA is
long, hold for two cycles. During page-mode reads, the initial access time can be determined using
the formula:
tADD-DELAY (ns)tDATA (ns) + tAVQV (ns)
Subsequent reads in page mode are defined by:
tAPA (ns) + tDATA (ns)
(minimum time)
Note:
WAIT shown asserted high (RCR[10]=1).
Figure 41.
Data Output Configuration with WAIT Signal Delay
DQ
15-0 [Q]
CLK [C]
Valid
Output
Valid
Output
Valid
Output
DQ
15-0 [Q]
Valid
Output
1 CLK
Data Hold
WAIT (CR.8 = 1)
WAIT (CR.8 = 0)
t
CHQV
t
CHQV
WAIT (CR.8 = 0)
WAIT (CR.8 = 1)
2 CLK
Data Hold
t
CHTL/H
Note 1
Valid
Output
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