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PF38F5070MJP0B 数据表(PDF) 85 Page - Numonyx B.V |
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PF38F5070MJP0B 数据表(HTML) 85 Page - Numonyx B.V |
85 / 102 page November 2007 Datasheet Order Number: 290701-18 85 Numonyx™ Wireless Flash Memory (W18) If RCR[3]=1 (no-wrap mode) and RCR[2:0] = 1h (4-word burst length), then possible linear burst sequences are 0-1-2-3, 1-2-3-4, 2-3-4-5, and 3-4-5-6. RCR[3]=1 not only enables limited non-aligned sequential bursts, but also reduces power by minimizing the number of internal read operations. Setting RCR[2:0] bits for continuous linear burst mode (7h) also achieves the above 4- word burst sequences. However, significantly more power may be consumed. The 1-2- 3-4 sequence, for example, consumes power during the initial access, again during the internal pipeline lookup as the processor reads word 2, and possibly again, depending on system timing, near the end of the sequence as the device pipelines the next 4-word sequence. RCR[3]=1 while in 4-word burst mode (no-wrap mode) reduces this excess power consumption. 14.10 Burst Length (RCR[2:0]) The Burst Length bit (BL[2:0]) selects the number of words the device outputs in synchronous read access of the flash memory array. The burst lengths are 4-word, 8- word, 16-word, and continuous word. Continuous-burst accesses are linear only, and do not wrap within any word length boundaries (see Table 35, “Sequence and Burst Length” on page 84). When a burst cycle begins, the device outputs synchronous burst data until it reaches the end of the “burstable” address space. |
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