Electronic Components Datasheet Search |
|
HSP43124PC-45 Datasheet(PDF) 6 Page - Intersil Corporation |
|
HSP43124PC-45 Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 17 page 6 halts at the 128th register location, and writing is disabled. The coefficient address pointer is reset when any other configuration register is written or read. NOTE: A new coefficient set may be loaded during a filter calculation at the risk of corrupting output data until the load is complete. The number of coefficients that must be loaded is dependent on whether the coefficient set exhibits even symmetry, odd symmetry, or asymmetry (see Figure 4). For filters that exhibit either even or odd symmetry, only the unique half of the coefficient set must be loaded. The coefficients are loaded in order starting with the first filter tap and ending with the center tap. The coefficient associated with the first tap is the first to be multiplied by an incoming data sample as shown in Figure 5. For even/odd symmetric filters of length N, N/2 coefficients must be loaded if the filter length is even, and (N+1)/2 coefficients must be loaded if the filter length is odd. For example, a 17 tap symmetric filter would require the loading of 9 coefficients. Enough storage is provided for a 256 tap symmetric filter. For asymmetric filters the entire coefficient set must be loaded. The coefficients are loaded in order starting with the first tap and ending with the final filter tap (see Figure 5 for tap/coefficient association). Enough storage is provided for a 128 tap asymmetric filter. For asymmetric filters the value loaded into the Programmable Filter Length Register addressed must be twice the actual number of coefficients. Reading Coefficients The coefficients are read from the storage registers one byte at a time via C0-7 as shown in Figure 6. To read the coefficients, the user first sets the Coefficient Read Enable bit to 1 (bit 4 of Filter Configuration Control Register). Setting this bit resets the RAM read pointer and disables the RAM from being written. Next, with A2-0 = 010, multiple “high” to “low” transitions of RD, output the coefficients on C0-7, one byte at a time, in the order they were written. NOTE: RD should not be “low” when WR is “low”. Data Input Data is serially input to the HSP43124 through the DIN input. On the rising edge of SCLK, the bit value present at DIN is clocked into the Variable Length Shift Register. The beginning of a serial data word is designated by asserting SYNCIN “high” one SCLK prior to the first data bit as shown EVEN SYMMETRIC NOTE: Filters with even symmetric coefficients exhibit symme- try about the center of the coefficient set. Most FIR filters have coefficients which are symmetric in nature. ODD SYMMETRIC NOTE: Odd symmetric coefficients have a coefficient envelope which has the characteristics of an odd function (i.e. coeffi- cients which are equidistant from the center of the coefficient set are equal in magnitude but opposite in sign). Coefficients designed to function as a differentiator or Hilbert Transform ex- hibit these characteristics. ASYMMETRIC NOTE: Asymmetric Coefficient sets exhibit no symmetry. FIGURE 4. COEFFICIENT CHARACTERISTICS A0-2 C0-7 A0-2 = 010 (BINARY) LSB MSB LSB MSB FIRST COEFFICIENT SECOND COEFFICIENT WR FIGURE 3. COEFFICIENT LOADING ODD LENGTH POINT OF SYMMETRY EVEN LENGTH 0.5 -0.5 0.25 -0.25 0.1 -0.1 CENTER OF COEFFICIENT SET Z-1 Z-1 + C0 C1 C2 X(n) INPUT Y(n) OUTPUT FIRST FILTER TAP LAST FILTER TAP FIGURE 5. THREE TAP TRANSVERSAL FILTER ARCHITECTURE X2 X1 X0 Y(n) = C0X2 + C1X1 + C2X0 A0-2 C0-7 A0-2 = 010 (BINARY) LSB MSB LSB MSB FIRST COEFFICIENT SECOND COEFFICIENT RD FIGURE 6. COEFFICIENT READING HSP43124 |
Similar Part No. - HSP43124PC-45 |
|
Similar Description - HSP43124PC-45 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |