参数资料
型号: PH28F128W18BD60A
厂商: INTEL CORP
元件分类: PROM
英文描述: 8M X 16 FLASH 1.8V PROM, 60 ns, PBGA56
封装: 9 X 11 MM, 1 MM HEIGHT, LEAD FREE, VFBGA-56
文件页数: 95/106页
文件大小: 1496K
代理商: PH28F128W18BD60A
Intel
Wireless Flash Memory (W18)
Datasheet
Intel Wireless Flash Memory (W18)
07-Dec-2005
Order Number: 290701, Revision: 015
89
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 processor’s minimum data set-up time and the
flash memory’s 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 39, “Data Output Configuration with WAIT
A method for determining this configuration setting is shown below.
To set the 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 66 MHz and a clock period of 15 ns. Assume the data
output hold time is one clock. Apply this data to the formula above for the subsequent reads:
11 ns + 4 ns
15 ns
This equation is satisfied, and data output will be 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 by the formula:
tADD-DELAY (ns) + tDATA (ns) + tAVQV (ns)
Subsequent reads in page mode are defined by:
tAPA (ns) + tDATA (ns)
(minimum time)
Table 32.
WAIT Signal Conditions
CONDITION
WAIT
CE# = VIH
CE# = VIL
Tri-State
Active
OE#
No-Effect
Synchronous Array Read
Active
Synchronous Non-Array Read
Asserted
All Asynchronous Read and all Write
Asserted
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