PDF LF48908QC31 Data sheet ( Hoja de datos )

Número de pieza	LF48908QC31
Descripción	Two Dimensional Convolver
Fabricantes	LOGIC Devices Incorporated
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No Preview Available ! DEVICES INCORPORATED DEVICES INCORPORATED LF48908 Two DimensLioFna4l C8o9nv0ol8ver Two Dimensional Convolver FEATURES DESCRIPTION u 40 MHz Data and Computation Rate u Nine Multiplier Array with 8-bit Data and 8-bit Coefficient Inputs u Separate Cascade Input and Output Ports u On-board Programmable Row Buffers u Two Coefficient Mask Registers u On-board 8-bit ALU u Two’s Complement or Unsigned Operands u Replaces Harris HSP48908 u DECC SMD No. 5962-93007 u Package Styles Available: • 84-pin Plastic LCC, J-Lead • 100-pin Plastic Quad Flatpack The LF48908 is a high-speed two dimensional convolver that imple- ments a 3 x 3 kernel convolution at real-time video rates. Programmable row buffers are located on-chip, eliminating the need for external data storage. Each row buffer can store up to 1024 pixels. Two internal register banks are provided allowing two separate sets of filter coefficients to be stored simultaneously. Adaptive filter operations are possible when both register banks are used. An on-chip ALU is provided, allowing real-time arithmetic and logical pixel point operations to be performed on the image data. The 3 x 3 convolver comprises nine 8 x 8-bit multipliers, various pipeline registers, and sum- mers. A complete sum-of-products operation is performed every clock cycle. The FRAME signal resets all data registers without affecting the control and coefficient registers. Pixel and coefficient input data are both 8-bits and can be either signed or unsigned integers. Image data should be in a raster scan non-interlaced format. The LF48908 can internally store images as wide as 1024 pixels for the 3 x 3 convolution. By using external row buffers and multiple LF48908s, longer pixel rows can be used and convolutions with larger kernel sizes can be performed. Out- put data is 20-bits and this guarantees no overflow for kernel sizes up to 4 x 4. A separate cascade input is used as the data input for summing results from multiple LF48908s. It can also function as the data input path when external line buffers are used. 1 2 3 4 5 6 7 FIGURE 1. LF48908 BLOCK DIAGRAM 8 CASI15-0 DIN7-0 CIN9-0 A2-0 LD CS 16 8 8 3 CLK HOLD EALU RESET FRAME OE ALU ROW BUFFERS 3x3 CONVOLVER 20 DOUT19-0 8 CASO7-0 CONTROL LOGIC 9 10 11 Video Imaging Products 1 08/9/2000–LDS.48908-J 1 page DEVICES INCORPORATED LF48908 Two Dimensional Convolver FIGURE 4. LF48908 CONTROL LOGIC BLOCK DIAGRAM A2-0 3 LD CS CIN9-0 10 LMC ADDRESS DECODE ENCR1 ENCR0 CAS CR1 CR0 LMC EOR ALU MICROCODE REGISTER 10 ALU MICROCODE EOR CAS 8-0 9 ROW LENGTH REGISTER 10 ROW LENGTH INITIALIZATION REGISTER 9 INITIALIZATION DATA 7-0 CR0 8 COEFFICIENT REGISTER 0 I0 OE H0 OE G0 OE F0 OE E0 OE D0 OE C0 OE B0 OE A0 OE ENCR1 ENCR0 SQ RQ 888888888 I H G F E D C B A 1 2 3 4 5 6 7 7-0 CR1 8 OE I1 OE H1 OE G1 OE F1 OE E1 OE D1 OE C1 OE B1 OE A1 COEFFICIENT REGISTER 1 through the CIN bus using A2-0, CS, and LD (see Figure 4). All the Control Logic Registers are set to their default values when RESET is active. FRAME does not affect the values in these registers. ALU Microcode Register Operation of the ALU and shifter are determined by the value stored in the ALU Microcode Register. This 10-bit instruction word is divided into two fields. The lower seven bits define the arithmetic and logical operations of the ALU. The upper three bits specify shift distance and direction. Tables 1 and 2 detail the various instruction words. This register is loaded through CIN9-0 using the A2-0, CS, and LD controls. Also see Arithmetic Logic Unit section. Row Length Register The value stored in the Row Length Register determines the number of delay stages for each row buffer. The number of delay stages should be set equal to the row length of the input image. The Row Length Register may be loaded with the values 0 through 1023 (0 represents 1024 delay stages). It is possible to program the row buffers to have 1 or 2 delay stages, but this will lead to meaningless results for a 3 x 3 convolution. This register is loaded through CIN9-0 using the A2-0, CS, and LD controls. Once the Row Length Register has been loaded, a new value can not be loaded until the LF48908 has been reset. This is done by asserting RESET. After RESET goes HIGH, the Row Length Register must be loaded within 1024 CLK cycles. If the Row Length Register is not loaded within 1024 CLK cycles, the register will automatically be loaded with a “0”. Initialization Register The Initialization Register configures various functions of the device including: input data delay, input data format, coefficent data format, output rounding, cascade mode, and cascade input shift (see Table 3). This register is loaded through CIN8-0 using the A2-0, CS, and LD controls. Coefficient Registers - CREG0, CREG1 The Coefficient Registers are used to store the filter coefficients for the multiplier array. Each Coefficient 8 9 10 11 Video Imaging Products 5 08/9/2000–LDS.48908-J 5 Page DEVICES INCORPORATED LF48908 Two Dimensional Convolver COMMERCIAL OPERATING RANGE (0°C to +70°C) Notes 9, 10 (ns) Symbol Parameter tLPW LD Pulse Width tLCS LD Setup Time (Applies only during active operation) tCDS Configuration Data Setup Time tCDH Configuration Data Hold Time tAS Address Setup Time tAH Address Hold Time tCSS CS Setup Time tCSH CS Hold Time 50 Min Max 20 30 16 0 13 0 0 0 LF48908– 31 Min Max 12 25 14 0 13 0 0 0 25 Min Max 8 15 10 0 10 0 0 0 MILITARY OPERATING RANGE (–55°C to +125°C) Notes 9, 10 (ns) Symbol Parameter tLPW LD Pulse Width tLCS LD Setup Time (Applies only during active operation) tCDS Configuration Data Setup Time tCDH Configuration Data Hold Time tAS Address Setup Time tAH Address Hold Time tCSS CS Setup Time tCSH CS Hold Time 111111111111111111111111111111122222222222222222222222222222223333333333333333333333333333333M12234444444444444444444444444444444i000500555555555555555555555555555555507n6666666666666666666666666666666777777777777777777777777777777758888888888888888888888888888888099999999999999999999999999999990000000000000000000000000000000M11111111111111111111111111111112222222222222222222222222222222a3333333333333333333333333333333x44444444444444444444444444444445555555555555555555555555555555666666666666666666666666666666677777777777777777777777777777778888888888888888888888888888888M99999999999999999999999999999991113L0000000000000000000000000000000i5570000nF111111111111111111111111111111142222222222222222222222222222222383333333333333333333333333333333744444444444444444444444444444449555555555555555555555555555555506666666666666666666666666666666M87777777777777777777777777777777–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 1 2 3 4 5 6 7 8 9 SWITCHING WAVEFORMS: CONFIGURATION DATA CLK LD CIN9-0 A2-0 CS tCSS tLPW tCDS tAS tLCS tCDH tAH tCSH 10 11 applies only when the LF48908 is in active operation. 11112222D3333I4444S5555C6666O7777N8888TI9999N0000U1111E2222D3333S4444P5555E6666E7777D88889999G0000R1111A2222D3333E4444 Video Imaging Products 11 08/9/2000–LDS.48908-J 11 Page

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