Motore di ricerca datesheet componenti elettronici |
|
LF3320QC12 Scheda tecnica(PDF) 9 Page - LOGIC Devices Incorporated |
|
LF3320QC12 Scheda tecnica(HTML) 9 Page - LOGIC Devices Incorporated |
9 / 24 page DEVICES INCORPORATED Video Imaging Products 2-9 LF3320 Horizontal Digital Image Filter 08/16/2000–LDS.3320-N The LF3320 is capable of supporting 24-bit data and 12-bit coefficients or 12-bit data and 24-bit coefficients. When configured for this mode of operation, the Filter B output is scaled by 2-12 before adding it to the Filter A output. This mode of operation is only valid in single filter mode. To configure the LF3320 for this mode, bit 3 of Configuration Register 5 must be set to 1; this will account for the scaling function (Table 7). For 24-bit data, DIN11-0 becomes the MSB (Filter A) and RIN11-0 becomes the LSB (Filter B), bit 2 of Configuration Register 5 must be set to 0. To insure correct results, the coefficient sets must be aligned appropriately; that is to say, the coefficient set used for the MSB must be the same for the LSB. For 24-bit coefficients, the coefficient banks for Filter A will correspond to the coefficient MSB and the coefficient banks for Filter B will correspond to the coefficient LSB; therefore, bit 2 must be set to 1. Once again, to insure correct results, the coefficient sets must be aligned appropriately; that is to say, the MSB coefficients must correspond to their LSB coefficients. The output data will appear at DOUT15-0; output appearing at ROUT3-0/COUT11-0 will not be of any value. Bit 1 is set to 0 (for single filter mode) and bit 0 is set to 0 (cascade mode must be disabled). Therefore, to realize 24-bit data/12-bit coefficients the user must write 008H to Configuration Register 5; conversely, for 12-bit data/24-bit coefficients the user must write 00CH to Configuration Register 5. The Double Wide Data/Coefficient Mode is valid in the Matrix Multiplica- tion Mode; however, special consider- ations must be observed when these two modes are combined. The LF3320 must be configured for single filter mode only, for a maximum (8x8) matrix. In addition, the user must disable the cascaded filter mode, the accumulator access mode, and the data DIN11-0 I/D REGISTERS FILTER A FILTER B DOUT15-0 I/D REGISTERS R.S.L. CIRCUIT R.S.L. CIRCUIT 12 16 ROUT3-0 / COUT11-0 16 RIN11-0 12 FIGURE 11. ACCUMULATOR ACCESS MODE reversal (Table 7). For additional considerations, refer to the correspond- ing mode of operation section. Accumulator Access Mode Accumulator access allows the user to accumulate the Filter A output with the Filter B output. Therefore, this mode is only valid when the device has been configured for dual filter operation. To configure the device for this mode, bit 1 and bit 5 must be set to 1; bit 5 is the corresponding accumulator access bit (Table 7). Writing 022H to Configura- tion Register 5 configures the device to accumulate the Filter A output with the Filter B output. All remaining Configu- ration Registers, 0 through 4 inclusive, will depend on specific application requirements (see Tables 2 through 4). In this mode of operation, the accumu- lated output is realized at DOUT15-0. The output data at ROUT15-0/COUT15-0 is the Filter B output that is normally expected; however, the accumulated output data (DOUT15-0) will be delayed by one clock cycle, compared to the Filter B output data. This type of operation is useful when two filtered data streams (i.e. I+jQ) need to be accumulated. Such is the requirement to satisfy the equation, y(t) = cos(vt)+jsin(vt). The complex data can be streamed and filtered using a respective ‘I’ filter and ‘Q’ filter. To convert the complex result into a real result, as seen at the LF3320 output, two multiplies and one accu- mulation is required. The cosine and sine functions are realized through the coefficient sets; consequently, multi- plied by the corresponding ‘I’ and ‘Q’ data streams. To satisfy the remainder of the equation, Filter A and Filter B must be accumulated. As previously stated, this mode of operation is only valid with the dual filter mode configuration. All modes of operation, that are valid in the dual filter mode, are valid with the accumu- lator access mode. For additional considerations, refer to the correspond- ing mode of operation section. FUNCTIONAL DESCRIPTION ALUs The ALUs double the number of filter taps available, when symmetric coefficient sets are used, by pre-adding data values which are then multiplied byacommoncoefficient(see Figure 12). |
Codice articolo simile - LF3320QC12 |
|
Descrizione simile - LF3320QC12 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEETIT.COM |
Lei ha avuto il aiuto da alldatasheet? [ DONATE ] |
Di alldatasheet | Richest di pubblicita | contatti | Privacy Policy | scambio Link | Ricerca produttore 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 |