 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
PDSP16256 Datasheet(PDF) 6 Page - Mitel Networks Corporation |
|
||||||||||||||||||||||||||||||
PDSP16256 Datasheet(HTML) 6 Page - Mitel Networks Corporation |
|
|
6 / 28 page  PDSP16256 6 Figure. 4 Block Diagram Operational Overview The PDSP16256 is an application specific FIR filter for use in high performance digital signal processing systems. Sampling rates can be up to 25MHz. The device provides the filter function without any software development, and the options are simply selected by loading a control register. The device can be user configured as either a single filter, or as two separate filters. The latter can provide two independent filters for the in-phase and quadrature channels after IQ splitting, or can provide two filters in cascade for greater stop band rejection. The device operates from a system clock, with rates up to 25MHz. This clock must be 1, 2, 4, or 8 times the required sampling frequency, with the higher multiplication rates producing longer filter networks at the expense of lower sampling rates. Devices can be connected in cascade to produce longer filter lengths. This can be accomplished without the need for any additional external data delays, and all the single device options remain available. Continuous inputs are accepted, and continuous results produced after the internal pipeline delay. Connection can be made directly to an A-D converter. The filter operation can be synchronised to a Filter Enable signal (FEN) whose positive going edge marks the first data sample. The internal multiplier accumulator array can be cleared with a dedicated input. This is necessary if erroneous results obtained during the normal data ‘flush through’ are not permissible in the system. Coefficients can be loaded from a host system using a conventional peripheral interface and separate data bus. Alternatively, they can be loaded as a complete set from a byte wide EPROM. The device produces addresses for the EPROM and a BUSY output indicates that the transfer is occurring. Up to sixteen devices can have their coefficients supplied from a single EPROM. These devices need not necessarily be part of the same filter network. Each of the filter networks shown in Fig. 4 contains eight systolic multiplier accumulator stages; an example with four stages is shown in Fig. 5. Input data flows through the delay lines and is presented for multiplication with the required coefficient. This is added to either the last result from this accumulator or the result from the previous accumulator. The filter results progress along the adders at the data sample rate. If the sample rate equals SCLK divided by four, for example, then the accumulated result is passed onto the next stage every fourth cycle. The structure described is highly efficient when used to calculate filtered results from continuous input data. A comprehensive digital filter design program is available for PC compatible machines. This will optimise the filter coefficients for the filter type required and number of taps available at the selected sample rate within the PDSP16256 device. An EPROM file can be automatically generated in Motorola S-record format. SWAP A7:0 C15:0 CCS WEN CS BYTE EPROM FEN DFEN DCLR RES COEFFICIENT STORAGE AND CONTROL SCLK FRUN CLKOP BUSY DA15:0 F31:0 OEN NETWORK A NETWORK B DUAL MODE SINGLE MODE MUX DB15:0 X31:0 |
Similar Part No. - PDSP16256 |
|
Similar Description - PDSP16256 |
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
