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LF3330QC15 数据表(PDF) 7 Page - LOGIC Devices Incorporated

部件名 LF3330QC15
功能描述  Vertical Digital Image Filter
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制造商  LODEV [LOGIC Devices Incorporated]
网页  http://www.logicdevices.com
标志 LODEV - LOGIC Devices Incorporated

LF3330QC15 数据表(HTML) 7 Page - LOGIC Devices Incorporated

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DEVICES INCORPORATED
Video Imaging Products
7
LF3330
Vertical Digital Image Filter
11/08/2001–LDS.3330-M
ADDR1
DATA1
ADDR2
CONFIGURATION REGISTER
CLK
LD
CF11-0
W2
W1: Configuration Register loaded with new data on this rising clock edge.
PAUSE
DATA1
SELECT REGISTER
W1
W2: Select Register loaded with new data on this rising clock edge.
Limiting
An output limiting function is
provided for the output of the
filter. The limit registers deter-
mine the valid range of output
values when limiting is enabled
(Bit 0 in Configuration Register 2).
There are sixteen 32-bit limit
registers. RSL3-0 determines
which limit register is used during
the limit operation. A value of 0
on RSL3-0 selects limit register 0.
A value of 1 selects limit register 1
and so on. Each limit register
contains both an upper and lower
limit value. If the value fed to the
limiting circuitry is less than the
lower limit, the lower limit value
is passed as the filter output. If
the value fed to the limiting
circuitry is greater than the upper
limit, the upper limit value is
passed as the filter output. RSL3-0
may be changed every clock cycle
if desired. This allows the limit
range to be changed every clock
cycle. This is useful when filtering
interleaved data. When loading
limit values into the device, the
upper limit must be greater than
the lower limit. Limit register
loading is discussed in the LF
InterfaceTM section.
Coefficient Banks
The coefficient banks store the
coefficients which feed into the
multipliers in the filter. There is a
separate bank for each multiplier.
Each bank can hold 256 12-bit
coefficients. The banks are loaded
using the LF InterfaceTM. Coefficient
bank loading is discussed in the
LF InterfaceTM section.
Configuration and Control Registers
The configuration registers deter-
mine how the LF3330 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.
Each round register is 32 bits wide.
RSL3-0 determines which round
register is used for rounding.
There are sixteen select registers.
Each select register is 5 bits wide.
RSL3-0 determines which select
register is used for the select cir-
cuitry.
There are sixteen limit registers.
Each limit register is 32 bits wide
and stores both an upper and lower
limit value. The lower limit is
stored in bits 15-0 and the upper
FIGURE 9. CONFIGURATION AND SELECT REGISTER LOADING SEQUENCE WITH PAUSE IMPLEMENTATION
FIGURE 8. COEFFICIENT BANK LOADING SEQUENCE WITH PAUSE IMPLEMENTATION
ADDR1
COEF0
COEF1
COEFFICIENT SET 1
CLK
CF11-0
PAUSE
COEF7
LD
W1: Configuration Register loaded with new data on this rising clock edge.
W1


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