lf3338 LOGIC Devices Incorporated, lf3338 Datasheet

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lf3338

Manufacturer Part Number
lf3338
Description
8-bit Vertical Digital Image Filter
Manufacturer
LOGIC Devices Incorporated
Datasheet
DEVICES INCORPORATED
FEATURES
LF3338 B
DEVICES INCORPORATED
83 MHz Data Rate
8-bit Data and 12-bit Coefficients
Supports Interleaved Data Streams
Cascadable for More Filter Taps
Seven 3K x 8-bit, Dynamic Program-
mable Two-Mode Line Buffers
On-board Memory for 256
Coefficient Sets
LF Interface
Coefficient Sets to be Updated
Within Vertical Blanking
Selectable 16-bit Data Output with
User-Defined Rounding and
Limiting
Separate Input Port for Odd and
Even Field Filtering
8 Filter Taps
3.3 Volt Power Supply
5 Volt Tolerant I/O
Purchase Description
DIN
VB
7-0
7-0
LOCK
TM
Allows All 256
8
8
D
IAGRAM
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
3K LINE BUFFER
The LF3338 is a lower cost version of
the 12-bit LF3330 and is suited for
multimedia and special effects systems,
projectors, plasma display panels, scan
converters, set-top boxes, and other
consumer applications.
This device filters digital images in
the vertical dimension at real-time
video rates. Input data is 8 bits and
coefficient data is 12 bits and both are
in two’s complement format. The
output is also in two’s complement
format and may be rounded to 16 bits.
The filter is an 8-tap FIR filter with all
required line buffers contained on-
chip. The line buffers can store video
lines with lengths from 4 to 3076
pixels. Multiple LF3338s can be
cascaded together to create larger
vertical filters.
DESCRIPTION
8-Bit Vertical Digital Image Filter
1
32
8-Bit Vertical Digital Image Filter
CIRCUITRY
SELECT
ROUND
LIMIT
Due to the length of the line buffers,
interleaved data can be fed directly
into the device and filtered without
separating the data into individual
data streams. The number of inter-
leaved data sets that the device can
handle is limited only by the length of
the on-chip line buffers. If the inter-
leaved video line has 3076 data values
or less, the filter can handle it.
The LF3338 contains enough on-board
memory to store 256 coefficient sets.
The LF Interface
coefficient sets to be updated within
vertical blanking.
Selectable 16-bit data output with
user-defined rounding and limiting
minimizes the constraints put on
coefficient sets for various filter
implementations.
Video Imaging Products
OED
OEC
TM
16
8
LF3338
allows all 256
DOUT
COUT
04/06/1999–LDS.3338-B
15-0
7-0
LF3338

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lf3338 Summary of contents

Page 1

... LINE BUFFER 3K LINE BUFFER 8-Bit Vertical Digital Image Filter 8-Bit Vertical Digital Image Filter DESCRIPTION The LF3338 is a lower cost version of the 12-bit LF3330 and is suited for multimedia and special effects systems, projectors, plasma display panels, scan converters, set-top boxes, and other consumer applications ...

Page 2

... DEVICES INCORPORATED F 1. LF3338 F IGURE UNCTIONAL 8-Bit Vertical Digital Image Filter B D LOCK IAGRAM LIMIT SELECT ROUND 2 LF3338 Video Imaging Products 04/06/1999–LDS.3338-B ...

Page 3

... COUT is a 8-bit cascade output 7-0 port. COUT on one device 7-0 should be connected to DIN another LF3338. Controls LD — Coefficient Load TM When LD is LOW, data latched into the LF Interface on the rising edge of CLK. When LD is HIGH, data can not be latched into the LF Interface ...

Page 4

... A value RSL selects round/ 3-0 select/limit register 0. A value of 1 selects round/select/limit register 1 and so on. RSL is latched on the 3-0 4 LF3338 F 4. RSL C IGURE IRCUITRY RSL DATA IN 3 RND 32 5 ...

Page 5

... The LF3338 is capable of handling interleaved data. The number of data sets it can handle is determined by the number of data values contained in a video line. If the interleaved video line has 3076 data values or less, the LF3338 can handle it no matter how many data sets are interleaved together ...

Page 6

... DEVICES INCORPORATED 3 set to “0”. Any LF3338s cascaded after the first LF3338 should have Bit 0 of Configuration Register 3 set to “1”. When not cascading, Bit 0 of Configuration Register 3 should be set to “0” important to note that the first multiplier on all cascaded devices should not be used ...

Page 7

... Vertical Digital Image Filter Configuration and Control Registers 3-0 The configuration registers deter- mine how the LF3338 operates. Tables 2 through 5 show the formats of the four configuration registers. There are three types of control registers: round, select, and limit. There are sixteen round registers. ...

Page 8

... DATA Video Imaging Products 04/06/1999–LDS.3338-B LF3338 ...

Page 9

... E01 14 E0E 15 E0F Video Imaging Products 04/06/1999–LDS.3338-B LF3338 ...

Page 10

... Video Imaging Products 04/06/1999–LDS.3338-B LF3338 ...

Page 11

... T = 25° MHz 25° MHz A 11 8-Bit Vertical Digital Image Filter Voltage Supply Min Typ 2.4 2.0 0.0 Video Imaging Products 04/06/1999–LDS.3338-B LF3338 Max Unit V 0.4 V 5 µA 10 µA 120 ...

Page 12

... Notes 9, 10 (ns) I DIN N+1 t CYC CA N+1 VB N+1 t ENA t DIS HIGH IMPEDANCE HIGH IMPEDANCE 12 8-Bit Vertical Digital Image Filter Min 0 DOUT - COUT - N 1 Video Imaging Products 04/06/1999–LDS.3338-B LF3338 LF3338– 12 Max DOUT N COUT N ...

Page 13

... PAUSE t CFH t CFS CF 11–0 ADDRESS CF 0 (0°C to +70°C) Notes 9, 10 (ns) VALUES NOT VALID TM NTERFACE 8-Bit Vertical Digital Image Filter Min 0 Video Imaging Products 04/06/1999–LDS.3338-B LF3338 LF3338– 12 Max ...

Page 14

... Output delay, for example, is specified as a maximum since worst-case operation of any device always provides data within that time. 14 LF3338 11. For the t test, the transition is ENA measured to the 1.5 V crossing point with datasheet loads. For the t the transition is measured to the ± ...

Page 15

... PAUSE 64 VCC 63 GND COUT 0 57 COUT 1 56 COUT 2 55 COUT 3 54 COUT 4 53 COUT 5 52 COUT 6 51 COUT 7 Video Imaging Products 04/06/1999–LDS.3338-B LF3338 ...

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