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Coefficient Precision
The 2D FIR Filter IP core requires a fixed point type to be defined for the coefficients.
The user-entered coefficients (shown as white boxes in the parameter editor) are rounded to fit in the
chosen coefficient fixed point type (shown as purple boxes in the parameter editor).
Result to Output Data Type Conversion
After calculation, the fixed point type of the results must be converted to the integer data type of the
output.
The conversion is performed in four stages, in the following order:
1. Result scaling—scaling is useful to quickly increase the color depth of the output.
• The available options are a shift of the binary point right –16 to +16 places.
• Scaling is implemented as a simple shift operation so it does not require multipliers.
2. Removal of fractional bits—if any fractional bits exist, you can choose to remove them through these
methods:
• Truncate to integer—fractional bits are removed from the data; equivalent to rounding towards
negative infinity.
• Round - Half up—round up to the nearest integer. If the fractional bits equal 0.5, rounding is
towards positive infinity.
• Round - Half even—round to the nearest integer. If the fractional bits equal 0.5, rounding is
towards the nearest even integer.
3. Conversion from signed to unsigned— if any negative numbers exist in the results and the output type
is unsigned, you can convert to unsigned through these methods:.
• Saturate to the minimum output value (constraining to range).
• Replace negative numbers with their absolute positive value.
4. Constrain to range—if any of the results are beyond a specific range, logic to saturate the results to the
minimum and maximum output values is automatically added. The specific range is the specified
range of the output guard bands, or if unspecified, the minimum and maximum values allowed by the
output bits per pixel.
2D FIR IP Core Parameter Settings
Table 5-1: 2D FIR Parameter Settings
Parameter Value Description
Maximum image width 32-2600, Default = 640 Specify the maximum image width in pixels.
Number of color planes in
sequence
1, 2, 3 Select the number of color planes that are
sent in sequence over one data connection.
For example, a value of 3 for R'G'B' R'G'B'
R'G'B'.
5-2
Coefficient Precision
UG-VIPSUITE
2015.05.04
Altera Corporation
2D FIR Filter IP Core
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- 101 Innovation Drive 1
- San Jose, CA 95134 1
- Contents 2
- Feature Support 7
- Release Information 9
- Device Family Support 10
- IP Core Mode Latency 11
- Interfaces 28
- Video Formats 29
- D0 D1vid_data 32
- Signal Name Description 33
- Avalon-ST Video Protocol 34
- Video Data Packets 38
- Symbol transmitted first 39
- Symbol transmitted last 39
- Plane for even rows 40
- Plane for odd rows 40
- Control Data Packets 42
- Parameters 43
- Description 43
- Type Width Height Interlacin 43
- Order Symbol Order Symbol 45
- Ancillary Data Packets 46
- Packet Propagation 46
- Parameter Name Value 47
- Signal Width Direction 47
- Packet Transfer Examples 48
- Parameter Value 50
- Avalon-MM Slave Interfaces 52
- Avalon-MM Master Interfaces 55
- Related Information 56
- Getting Started 57
- OpenCore Plus IP Evaluation 59
- Control Port 60
- Format Description 61
- Interrupts 64
- Generator Lock 68
- Underflow and Overflow 70
- Timing Constraints 71
- Handling Ancillary Packets 71
- Modules Description 75
- Address Register Description 100
- UG-VIPSUITE 105
- 2015.05.04 105
- 2D FIR Filter IP Core 106
- Coefficient Precision 107
- Parameter Value Description 108
- 2D FIR Filter Signals 109
- Signal Direction Description 110
- Video Mixing IP Cores 112
- Alpha Blending 113
- Video Mixing Signals 116
- 20 Input 3 enable 121
- Chroma Resampler IP Core 122
- 4:4:4 to 4:2:2 123
- 4:2:2 to 4:4:4 123
- Vertical Resampling (4:2:0) 124
- Chroma Resampler Signals 126
- Video Clipping IP Cores 127
- Video Clipping Signals 130
- Color Plane Sequencer IP Core 135
- Rearranging Color Patterns 136
- Splitting and Duplicating 137
- Subsampled Data 138
- Color Plane Sequencer Signals 139
- IP Cores Feature 141
- Input and Output Data Types 142
- Color Space Conversion 142
- Operands 145
- Control Synchronizer IP Core 153
- Control Synchronizer Signals 157
- Deinterlacing IP Cores 160
- Deinterlacing Methods 161
- Bob with Scanline Duplication 162
- Motion-Adaptive 162
- Sobel-Based HQ Mode 164
- Frame Buffering 165
- Types Description 166
- Frame Rate Conversion 167
- Altera Corporation 168
- Send Feedback 168
- Deinterlacing Signals 176
- Register Address 190
- (Decimal) 190
- Register Suggested 190
- Settings 190
- Comments 190
- Tuning Motion Shift 191
- Frame Reader IP Core 192
- Frame Reader Signals 194
- Frame Buffer IP Cores 198
- Double Buffering 199
- Triple Buffering 199
- Locked Frame Rate Conversion 200
- Color Format 201
- Frame Buffer Signals 206
- Gamma Corrector IP Core 214
- Gamma Corrector Signals 215
- Interlacer IP Core 218
- Interlacer Parameter Settings 219
- Interlacer Signals 219
- Interlacer Control Registers 221
- Scaler II IP Core 222
- Bilinear Algorithm 223
- Double-Buffering 226
- Scaler II Parameter Settings 230
- Scaler II Signals 233
- Scaler II Control Registers 235
- Video Switching IP Cores 237
- Mixer Layer Switching 238
- Video Switching Signals 239
- Test Pattern 243
- Trace System IP Core 253
- Trace System Signals 255
- Trace Within System Console 258
- TCL Shell Commands 259
- Command Arguments Function 260
- Packet Visualization 263
- Monitor Settings 264
- Subscribe 269
- Avalon-ST Video Class Library 270
- Class Description 272
- Running the Tests 275
- Video File Reader Test 278
- Example Test Environment 281
- Video Field Life Cycle 282
- Constrained Random Test 283
- Code for Scoreboards 285
- Code for to_grey Function 286
- Complete Class Reference 287
- Method Call Description 288
- Member Description 288
- Raw Video Data Format 299
- Y 410 / A 2R 10 G 10 B 10 301
- Additional Information 306
- Date Version Changes 307
- How to Contact Altera 310
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