 |
数据搜索系统，热门电子元器件搜索 |
|
|
数据搜索系统，热门电子元器件搜索 |
|
PC48F4400P0YB0 数据表(PDF) 82 Page - Numonyx B.V |
|
||||||||||||||||||||||||||||||
PC48F4400P0YB0 数据表(HTML) 82 Page - Numonyx B.V |
|
|
82 / 102 page  Numonyx™ Wireless Flash Memory (W18) Datasheet November 2007 82 Order Number: 290701-18 Numonyx™ Wireless Flash Memory (W18) 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 Signal Delay” on page 83. 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 34: 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 |
类似零件编号 - PC48F4400P0YB0 |
|
类似说明 - PC48F4400P0YB0 |
|
|
链接网址 |
| 隐私政策 |
| ALLDATASHEETCN.COM |
| ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
Chinese ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
