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LF3330 Datasheet(PDF) 6 Page - LOGIC Devices Incorporated

Part No. LF3330
Description  Vertical Digital Image Filter
Download  15 Pages
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Maker  LODEV [LOGIC Devices Incorporated]
Homepage  http://www.logicdevices.com
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LF3330 Datasheet(HTML) 6 Page - LOGIC Devices Incorporated

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DEVICES INCORPORATED
LF3330
Vertical Digital Image Filter
6
Video Imaging Products
11/08/2001–LDS.3330-M
FIGURE 7. CONFIGURATION/CONTROL REGISTER LOADING SEQUENCE
ADDR1
DATA1
ADDR3
DATA4
CONFIG REG
ROUND REGISTER
LIMIT REGISTER
CLK
LD
CF11-0
W2
W1: Configuration Register loaded with new data on this rising clock edge.
W3
W4
W2: Select Register loaded with new data on this rising clock edge.
W3: Round Register loaded with new data on this rising clock edge.
DATA1
DATA3
DATA2
ADDR4
DATA2
DATA1
SELECT REG
ADDR2
DATA1
W4: Limit Register loaded with new data on this rising clock edge.
W1
DATA4
DATA3
3 set to “0”. Any LF3330s cascaded
after the first LF3330 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”.
It is important to note that the first
multiplier on all cascaded devices
should not be used. This is because
the first multiplier does not have a
line buffer in front of it. The coeffi-
cient value sent to the first multi-
plier on a cascaded device should be
“0”.
Rounding
The filter output may be rounded by
adding the contents of one of the
sixteen round registers to the filter
output (see Figure 4). Each round
register is 32 bits wide and user-
programmable. This allows the filter’s
output to be rounded to any precision
required. Since any 32-bit value may
be programmed into the round
registers, the device can support
complex rounding algorithms as well
as standard half-LSB rounding. RSL3-0
determines which of the sixteen round
registers are used in the rounding
operation. A value of 0 on RSL3-0
selects round register 0. A value of 1
selects round register 1 and so on.
RSL3-0 may be changed every clock
cycle if desired. This allows the
rounding algorithm to be changed
every clock cycle. This is useful when
filtering interleaved data. If rounding
is not desired, a round register should
be loaded with 0 and selected as the
register used for rounding. Round
register loading is discussed in the
LF InterfaceTM section.
Output Select
The word width of the filter output
is 32 bits. However, only 16 bits
may be sent to DOUT15-0. The select
circuitry determines which 16 bits
are passed (see Table 1). There are
sixteen select registers which control
the select circuitry. Each select
register is 5 bits wide and user-
programmable. RSL3-0 determines
which of the sixteen select registers
are used in the select circuitry.
Select register 0 is chosen by loading
a 0 on RSL3-0. Select register 1 is
chosen by loading a 1 on RSL3-0 and
so on. RSL3-0 may be changed every
clock cycle if desired. This allows
the 16-bit window to be changed
every clock cycle. This is useful
when filtering interleaved data.
Select register loading is discussed
in the LF InterfaceTM section.
ADDR1
COEF0
COEF7
ADDR2
COEF0
COEF7
ADDR3
COEF0
COEF7
COEFFICIENT SET 1
COEFFICIENT SET 2
COEFFICIENT SET 3
CLK
LD
CF11-0
W1
W1: Coefficient Set 1 written to coefficient banks during this clock cycle.
W2
W3
W2: Coefficient Set 2 written to coefficient banks during this clock cycle.
W3: Coefficient Set 3 written to coefficient banks during this clock cycle.
FIGURE 6. COEFFICIENT BANK LOADING SEQUENCE


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