參數(shù)資料
型號(hào): 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): 91/104頁
文件大?。?/td> 1443K
代理商: GE28F640W30TD70
28F640W30, 28F320W30, 28F128W30
Datasheet
Intel Wireless Flash Memory (W30)
June 2005
Order Number: 290702, Revision: 011
87
14.6
WAIT Delay (RCR[8])
The WAIT configuration bit (RCR[8]) controls WAIT signal delay behavior for all synchronous
read-array modes. This bit setting depends on the system and CPU characteristics. The WAIT can
be asserted either during, or one data cycle before, a valid output.
In synchronous linear read array (no-wrap mode RCR[3]=1) of 4-word, 8-word, 16-word, or
continuous-word burst mode, an output delay might occur when a burst sequence crosses its first
flash device-row boundary (16-word boundary).
If the burst start address is 4-word boundary aligned, the delay does not occur.
If the start address is misaligned to a 4-word boundary, the delay occurs once per burst-mode
read sequence. The WAIT signal informs the system of this delay.
14.7
Burst Sequence (RCR[7])
The burst sequence specifies the synchronous-burst mode data order (see Table 30, “Sequence and
Burst Length” on page 88). When operating in a linear burst mode, either 4-word, 8-word, or
16-word burst length with the burst wrap bit (RCR[3]) set, or in continuous burst mode, the flash
device might incur an output delay when the burst sequence crosses the first 16-word boundary.
(See Figure 39, “Word Boundary” on page 84 for word boundary description.)
Whether this delay occurs depends on the starting address.
If the starting address is aligned to a 4-word boundary, there is no delay.
If the starting address is the end of a 4-word boundary, the output delay is one clock cycle less
than the First Access Latency Count; this is the worst-case delay.
The delay takes place only once, and only if the burst sequence crosses a 16-word boundary. The
WAIT pin informs the system of this delay. For timing diagrams of WAIT functionality, see these
figures:
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