SERINADE TUTORIAL SERINADE tutorial assumes that SERINADE been su

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SERINADE TUTORIAL SERINADE tutorial assumes that SERINADE been su

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SERINADE
SERINADE TUTORIAL
SERINADE tutorial assumes that SERINADE been successfully installed configured (see Installation). This tutorial designed acquaint with SERINADE software package. SERINADE software designs HSP43124 Serial Filter configuration including filter coefficients from user specifications. toggled <Space> through available options. fields that select several options, value implemented immediately, whereas fields that require data file names must exited <Enter>, <Tab> arrow keys before value saved utilized alter configuration. Press <F1> help access context-sensitive on-line help files. When filter specification complete SERINADE computed valid filter configuration, <F2> pressed design programmable filter coefficients; save report, frequency, coefficient files; display system frequency responses graphically. begin tutorial, SERINADE directory (C:\SERINADE) type: SERINADE <Enter>
WORKING SERINADE
Movement within SERINADE follows standardized procedures. table below lists available editing options.
Right/Left Arrow Up/Down Arrow <Home> <End> <Del> <Backspace> <Ctrl>y DESCRIPTION Move Cursor Right Left Move Cursor Down Puts Cursor Start Field Puts Cursor Field Deletes Character Cursor Deletes Character Left Cursor Deletes Entire Field, Positions Cursor Beginning Field Moves Cursor from Column Column Moves Cursor From Changes Value Toggle Field Toggle Edit Mode Between Insert Overwrite When Insert Mode, Cursor Displayed Underline Character, While Overwrite Mode Displayed Block Character.
Lesson Decimating Filter Design Using SERINADE
HSP43124 SERIAL FILTER SPECIFICATION screen accepts following user-supplied design specifications: Input Sample Rate Decimation Factor Passband Transition Band Passband Attenuation Stopband Attenuation Order) Input Bits Output Bits FCLK Rate Type User Options When program starts, cursor Filter File field. Clear field pressing <Ctrl>y, then type: SER1.SER <Enter> HSP43124 SERIAL FILTER SPECIFICATION screen shown Figure appears.
<Tab> <Enter> <Space> <Insert>
select menu option, arrow, <Tab> <Enter> keys position cursor selected field. desired, clear field typing <Ctrl>y. Text then inserted overwritten (use <Insert> toggle edit mode). Fields that require numerical data file name entries
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data specifies filter with following attributes:
LESSON FILTER ATTRIBUTES SPECIFICATION Input Sample Rate: Decimation Factor: Passband: Transition Band: Passband Atten: Stopband Atten: specifications are: Input Bits: Output Bits: FCLK Type selected Type: user options selected Design Mode: Generate Report: Display Response: Save Frequency Responses: Save Response: Order: valid solution found given specifications reported Output Data Rate: FCLKS/CLKOUT: SCLK: FCLK: Decimation: Decimation: Order: 1.44 840.0 AUTO LOWPASS VALUE 60.0 500.0 250.0 1.01 100.0 UNIT
When satisfied with specification, Press <F2> start design. screen displays design status and, when complete, displays Frequency response screen shown Figure plots represent: Frequency Response: Shows equi-ripple passband stopband behavior over frequency range FSAMPLE/(2*DECHB) (the Nyquist frequency input). curve entering graph right side represents aliasing halfband filter stages. additional line FOUT/2 indicates folding frequency. System Frequency Response: Shows end-to-end frequency response designed filter verifies attenuation stopband FOUT/2Hz (the Nyquist frequency system output). dashed line indicates desired frequency response that entered SPECIFICATION screen. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen. User Options HSP43124 SERIAL FILTER SPECIFICATION screen, position cursor "Generate Report" field; using <Space> bar, toggle "Generate Report" YES. similar manner, "Display Response" LINEAR, "Save Freq Responses" YES, "Save Response" YES. Press <F2> design filter. Following computations, screen shown Figure appears.The interpretation data same presented above, except responses displayed linear scale, rather than log. linear scale readily apparent that response equi-ripple with maximum gain unity. Also note, system frequency response, equi-ripple profile falls near passband limit (i.e., 500.0Hz). This effect caused cascading Halfband sections. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen. Press <F10> exit program. Answer "SAVE FILE?" prompt before exiting SERINADE. (This will ignore changes SER1.SER.) text editor type command view data report files generated SERINADE. report file SER1.RPT contains user defined filter specifications well hexadecimal values needed load HSP43124 Serial Filter's control registers. frequency files, SER1H.FRQ, SER1F.FRQ, SER1S.FRQ contain magnitudes frequency responses halfband filters, filter endto-end frequency response units. SER1.IMP file contains impulse response data.
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FIGURE SERINADE INPUT SCREEN
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Lesson Only Design
Halfband filter section bypassed create SERIAL filter section only. filters using decimation, this accomplished setting Decimation Factor (For decimating filter using only FIR, enter MANUAL Design Mode enter Order Lesson After restarting program, change Filter File SER2 press <Enter>. data specifies filter with following attributes:
LESSON FILTER ATTRIBUTES SPECIFICATIONS Input Sample Rate: Decimation Factor: Passband: Transition Band: Passband Atten: Stopband Atten: specifications are: Input Bits: Output Bits: FCLK Type selected Type: LOWPASS 45.0 VALUE 60.0 30.0 0.50 50.0 UNIT
complete, displays frequency response screen shown Figure Note that section alone meets current design specifications. plot shows halfband aliasing, since half bands bypassed. Also note that system plots identical Decimation Factor through filter. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen.
Lesson Manual Design
HSP43124 SERIAL FILTER SPECIFICATION screen, change Decimation Factor toggle Design Mode MANUAL mode. Note that display changes with Decimation Order showing input fields editable user. computed Order taps. Press <F2> observe results, especially system stopband attenuation -63dB (Figure Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen. Save file changing Filter File name SER3.SER pressing <Enter> key. Answer "NO" "SAVE FILE" prompt "YES" "NEW FILE" prompt. Then press <F3> save file. Change Decimation Order Note that error will result long Decimation Factor field does match decimation that would result from current decimation number halfband filters that enabled. This error will prevent filter from being designed while entries fields inconsistent. results similar those produced from first design, lower order required: taps. This fact that more filtering being done Halfband filters. Press <F2> observe frequency response screen shown Figure Observe that stopband attenuation improved somewhat -70dB. this design, Halfband stage alias overlaps transition band. prevent novice users from getting unintended results, this condition allowed AUTO Design Mode. MANUAL Design Mode, SERINADE performs less checking input parameters, which allows user have more freedom. MANUAL Design Mode allows transition band overlap Halfband aliasing, allows transition band alias itself allowing output rate less than (passband transition band). Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen. Change Decimation Order (Bypassing Halfband filters completely). Again results similar those produced from first second designs, higher order required: taps. Press <F2> observe that stopband attenuation -56dB. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen.
user options same Lesson except: Order:
valid solution found given specifications reported Output Data Rate: FCLKS/CLKOUT: SCLK: FCLK: Decimation: Decimation: Order: 24.0 39.5
Note that SERINADE automatically bypassed Halfband filter stage setting Order This necessary meet Decimation Factor since each Halfband stage decimates minimum two. Press <F2> design filter. screen displays design status and, when
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FIGURE LINEAR PLOT FREQUENCY RESPONSE
Spec Number
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FIGURE MANUAL MODE DESIGN
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Lesson Half Band Filter Only Design
Halfband filter section bypassed create SERIAL filter configuration using only halfband filters. This accomplished setting type BYPASS. HSP43124 SERIAL FILTER SPECIFICATION screen, change Filter File SER4.SER press <Enter>. Answer "SAVE FILE?" prompt prevent overwriting SER3.SER. data specifies filter with following attributes:
LESSON FILTER ATTRIBUTES SPECIFICATIONS Input Sample Rate: Decimation Factor: Passband: Transition Band: Passband Atten: Stopband Atten: specifications are: Input Bits: Output Bits: FCLK Type selected Type: user options same before, except: Order: BYPASS 40.0 VALUE 36.0 30.0 0.50 144.0 UNIT
Lesson User-Supplied Design
HSP43124 SERIAL FILTER SPECIFICATION screen, <Space> select Type IMPORTED. File field, press <Ctrl>y delete default file name, then type SER5.IMP press <Enter>. symmetry should remain EVEN, which specifies that IMPORTED even symmetric FIR. HSP43124 data sheet explanation even symmetry. SER5.IMP filter with stopband attenuation 45dB. When using imported FIR, SERINADE estimates Stopband Attenuation using order reads from impulse response file current filter design specifications. (Note that filter specifications entered user necessarily match characteristics imported filter.) maximum value 198.0dB. user modify Order Stopband Attenuation fields, since SERINADE will simply recompute these values using imported order. other input fields modified, only filter specification SERINADE will attempt meet decimation factor. Press <F2> design filter. screen displays design status and, when complete, displays frequency response screen shown Figure Note that IMPORTED does meet current design specifications indicated dotted line. When using type IMPORTED, SERINADE software only attempts meet Decimation Factor specification calculating necessary number halfband filters cascade decimation. this mode user design meet desired design specifications. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen. Press <F10> exit SERINADE program. Respond "NO" "SAVE FILE?" prompt preserve original version SER4.SER.
valid solution found given specifications reported Output Data Rate: FCLKS/CLKOUT: SCLK: FCLK: Decimation: Decimation Order 250.0 24.0 14.0
Press <F2> design filter. screen displays design status and, when design complete, displays frequency response screen shown Figure Note that Halfband filter section does meet current design specifications. When using type BYPASS, SERINADE software only attempts meet Decimation Factor specification calculating necessary number halfband filters enable. addition, Order Stopband Attenuation fields modified user: they will always 144dB respectively. Note that halfband aliasing overlaps halfband frequency response that curves intersect their -6dB point. Press <Esc> return HSP43124 SERIAL FILTER SPECIFICATION screen.
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FIGURE RESPONSE HALFBAND FILTERS

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