поискавой системы для электроныых деталей |
|
LF48410JC25 датащи(PDF) 3 Page - LOGIC Devices Incorporated |
|
LF48410JC25 датащи(HTML) 3 Page - LOGIC Devices Incorporated |
3 / 15 page DEVICES INCORPORATED Video Imaging Products 3 LF48410 1024 x 24-bit Video Histogrammer 08/08/2000–LDS.48410-L HISTOGRAM MODE When the LF48410 is in this mode, the chip is configured as shown in Figure 1. The memory array keeps track of how many times a particular pixel value is used in a video image. The pixel value is input on PIN9-0 and is latched on the rising edge of CLK. Data at the address defined by PIN9-0 is read out of the memory array and incremented by one. The data is then written back to the memory array, in the same location it was read from, and is also output on DIO23-0 (if RD is LOW). As long as START is LOW, the device will be enabled for Histo- gram Mode. When START is HIGH, the device will still read pixel values, but the addres-sed data will not be incremented. The unchanged data is output on DIO23-0 and is not written back to the memory array (writing is disabled). START is delayed inter- nally three clock cycles to match the latency of the address generator. HISTOGRAM ACCUMULATE MODE When the LF48410 is in this mode, the chip is configured as shown in Figure 2. This mode is used to calculate the Cumulative Distribution Function of a video image. Before this can be done, the histogram of the image must already be in the memory array. The internal counter is used to generate address data for the memory array. Data at the address defined by the counter is read out of the memory array and added to the sum of the data from all previous address locations. This new value is written back to the memory array, in the same location where the last read occurred, and is also output on DIO23-0 (if RD is LOW). After all memory locations with histogram data are accumulated, the memory array will contain the Cumulative Distribution Function. After this mode is selected, the internal counter and all data path registers are reset to zero when START is set LOW. Every rising edge of CLK causes the counter to incre- ment its output by one until the counter reaches a value of 1023. At this point, the counter will hold the value of 1023 and writing to the memory array will be disabled. As long as START is LOW, the device will be enabled for Histogram Accu- mulate Mode. When START is HIGH, the counter will still increment its address values, but the addressed data will not be added to anything. The unchanged data is output on DIO23-0 and is not written back to the memory array (writing is disabled). START is delayed internally three clock cycles to match the latency of the address generator. LOOK UP TABLE MODE When the LF48410 is in this mode, the chip is configured as shown in Figure 3. This mode is used to perform fixed transformation functions on pixel values. The transformation function can be loaded into the memory array in Look Up Table Write Mode, Asynchronous 16/24 Mode, or Histogram Accumulate Mode. In Look Up Table Write Mode, data is loaded into the memory array using DIN23-0, CLK, and START. The internal counter is used to generate address data for the memory array. When START goes LOW, the counter is reset to zero. As long as START is LOW, data on DIN23-0 is latched on the rising edge of CLK and loaded FIGURE 1. HISTOGRAM MODE FIGURE 2. HISTOGRAM ACCUMULATE MODE RAM ARRAY DATA IN DATA OUT ADDRESS ADDRESS GENERATOR CONTROL START DIO I/F DIO23-0 24 RD COUNTER CLK (TO ALL REGISTERS) WR "0" PIN9-0 CLK TO ALL REGISTERS 10 RAM ARRAY DATA IN DATA OUT WR ADDRESS ADDRESS GENERATOR CONTROL START "0" "1" DIO I/F DIO23-0 24 RD |
Аналогичный номер детали - LF48410JC25 |
|
Аналогичное описание - LF48410JC25 |
|
|
ссылки URL |
Конфиденциальность |
ALLDATASHEETRU.COM |
Вашему бизинису помогли Аллдатащит? [ DONATE ] |
Что такое Аллдатащит | реклама | контакт | Конфиденциальность | обмен ссыками | поиск по производителю 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 |