Electronic Components Datasheet Search |
|
LF2246QC15 Datasheet(PDF) 2 Page - LOGIC Devices Incorporated |
|
LF2246QC15 Datasheet(HTML) 2 Page - LOGIC Devices Incorporated |
2 / 7 page DEVICES INCORPORATED LF2246 11 x 10-bit Image Filter Video Imaging Products 2-12 08/16/2000–LDS.2246-K FIGURE 1A.INPUT FORMATS INPUT REGISTER ENB1-4 ENSEL HELD 1 1 Data ‘N’ 1 0 Coefficient ‘N’ 0 X None X = “Don’t Care” ‘N’ = 1, 2, 3, or 4 TABLE 1. INPUT REGISTER CONTROL SIGNAL DEFINITIONS Power VCC and GND +5 V power supply. All pins must be connected. Clock CLK — Master Clock The rising edge of CLK strobes all en- abled registers. All timing specifica- tions are referenced to the rising edge of CLK. Inputs D19–0–D49–0 — Data Input D1–D4 are 10-bit data input registers. The LSB is DN0 (Figure 1a). C110–0–C410–0 — Coefficient Input C1–C4 are 11-bit coefficient input regis- ters. The LSB is CN0 (Figure 1a). Outputs S15–0 — Data Output The current 16-bit result is available on the S15–0 outputs (Figure 1b). OCEN — Clock Enable When OCEN is LOW, data in the pre- mux register (accumulator output) is loaded into the output register on the next rising edge of CLK. When OCEN is HIGH, data in the pre-mux register is held preventing the output register’s contents from changing (if FSEL does not change). Accumulation continues internally as long as ACC is HIGH, despite the state of OCEN. FSEL — Format Select When the FSEL input is LOW, the data input during the current clock cycle is assumed to be in fractional two’s complement format, and the upper 16 bits of the accumulator are presented at the output. Rounding of the accumula- tor result to 16 bits is performed if the accumulator control input ACC is LOW. When FSEL is HIGH, the data input is assumed to be in integer two’s complement format, and the lower 16 bits of the accumulator are presented at the output. No rounding is performed when FSEL is HIGH. ACC — Accumulator Control The ACC input determines whether in- ternal accumulation is performed on the data input during the current clock cycle. If ACC is LOW, no accumulation is performed, the prior accumulated sum is cleared, and the current sum of products is output. If FSEL is also LOW, one-half LSB rounding to 16 bits is per- formed on the result. This allows sum- mations without propagating roundoff errors. When ACC is HIGH, the emerg- ing product is added to the sum of the previous products, without additional rounding. FIGURE 1B.OUTPUT FORMATS 15 14 13 10 9 8 12 11 76543210 –2 6 (Sign) 2 5 2 4 2 1 2 0 2 –1 2 3 2 2 2 –2 2–3 2–4 2–5 2–6 2–7 2–8 2–9 Fractional Two’s Complement (FSEL = 0) 15 14 13 10 9 8 12 11 76543210 –2 15 (Sign) 2 14 213 2 10 2 9 2 8 2 12 211 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 Integer Two’s Complement (FSEL = 1) Data 98 7 2 1 0 –2 9 (Sign) 2 8 2 7 2 2 2 1 2 0 10 9 8 2 1 0 –2 10 (Sign) 2 9 2 8 2 2 2 1 2 0 Integer Two’s Complement (FSEL = 1) 98 7 2 1 0 –2 0 (Sign) 2 –1 2–2 2 –7 2–8 2–9 10 9 8 2 1 0 –2 1 (Sign) 2 0 2 –1 2 –7 2–8 2–9 Fractional Two’s Complement (FSEL = 0) Coefficient Controls ENB1–ENB4 — Input Enable The ENBN (N = 1, 2, 3, or 4) input allows either or both the DN and CN registers to be updated on each clock cycle. When ENBN is LOW, registers DN and CN are both strobed by the next rising edge of CLK. When ENBN is HIGH and ENSEL is LOW, register DN is strobed while register CN is held. If both ENBN and ENSEL are HIGH, register DN is held, and register CN is strobed (Table 1). ENSEL — Enable Select The ENSEL input in conjunction with the individual input enables ENB1– ENB4 determines whether the data or the coefficient input registers will be held on the next rising edge of CLK (Table 1). OEN — Output Enable When the OEN signal is LOW, the cur- rent data in the output register is avail- able on the S15–0 pins. When OEN is HIGH, the outputs are in a high-imped- ance state. |
Similar Part No. - LF2246QC15 |
|
Similar Description - LF2246QC15 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List 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 |