LF3320
DEVICES INCORPORATED
Horizontal Digital Image Filter
F
IGURE
2.
I
NPUT
F
ORMATS
Input Data
11 10 9
–2
11
2
10
2
9
(Sign)
SIGNAL DEFINITIONS
Power
V
CC
and GND
+3.3 V power supply. All pins must be
connected.
Clock
CLK — Master Clock
The rising edge of CLK strobes all
enabled registers.
Inputs
DIN
11-0
— Data Input
DIN
11-0
is the 12-bit data input port to
Filter A. In Dual Filter Mode, DIN
11-0
can also be the 12-bit input port to
Filter B. Data is latched on the rising
edge of CLK.
RIN
11-0
— Reverse Cascade Input
In Single Filter Mode, RIN
11-0
is the 12-
bit reverse cascade input port. This
port is connected to ROUT
11-0
of
another LF3320. In Dual Filter Mode,
RIN
11-0
can be the 12-bit input port to
Filter B. Data is latched on the rising
edge of CLK.
CFA
11-0
— Coefficient A Input
CFA
11-0
is used to load data into the
Filter A coefficient banks (banks 0
through 7) and the configuration/
control registers. Data present on
CFA
11-0
is latched into the Filter A LF
Interface
TM
on the rising edge of CLK
when LDA is LOW (see the LF
Interface
TM
section for a full discus-
sion).
CAA
7-0
— Coefficient Address A
CAA
7-0
determines which row of data
in coefficient banks 0 through 7 is fed
to the multipliers. CAA
7-0
is latched
into Coefficient Address Register A on
the rising edge of CLK when CENA is
LOW.
Coefficient Data
11 10 9
–2
0
2
–1
2
–2
(Sign)
2 1 0
2
2
2
1
2
0
2 1 0
2
–9
2
–10
2
–11
F
IGURE
3. A
CCUMULATOR
O
UTPUT
F
ORMATS
Accumulator A Output
31 30 29
–2
20
2
19
2
18
(Sign)
Accumulator B Output
31 30 29
–2
20
2
19
2
18
(Sign)
2 1 0
2
–9
2
–10
2
–11
2 1 0
2
–9
2
–10
2
–11
T
ABLE
1.
SLCT
4-0
00000
00001
00010
O
UTPUT
F
ORMATS
S
15
S
14
S
13
F
15
F
16
F
17
F
14
F
15
F
16
F
13
F
14
F
15
···
···
···
···
S
8
F
8
F
9
F
10
S
7
F
7
F
8
F
9
···
···
···
···
S
2
F
2
F
3
F
4
S
1
F
1
F
2
F
3
S
0
F
0
F
1
F
2
·
·
·
01110
01111
10000
·
·
·
F
29
F
30
F
31
·
·
·
F
28
F
29
F
30
·
·
·
F
27
F
28
F
29
·
·
·
···
···
···
F
22
F
23
F
24
·
·
·
F
21
F
22
F
23
·
·
·
···
···
···
F
16
F
17
F
18
·
·
·
F
15
F
16
F
17
·
·
·
F
14
F
15
F
16
CFB
11-0
— Coefficient B Input
CFB
11-0
is used to load data into the
Filter B coefficient banks (banks 8
through 15) and the configuration/
control registers. Data present on
CFB
11-0
is latched into the Filter B LF
Interface
TM
on the rising edge of CLK
when LDB is LOW (see the LF
Interface
TM
section for a full discussion).
CAB
7-0
— Coefficient Address B
CAB
7-0
determines which row of data in
coefficient banks 8 through 15 is fed to the
multipliers. CAB
7-0
is latched into
Coefficient Address Register B on the
rising edge of CLK when CENB is LOW.
Outputs
DOUT
15-0
— Data Output
DOUT
15-0
is the 16-bit registered data
output port for the overall filter (Single
Filter Mode) or Filter A (Dual Filter
Mode).
COUT
11-0
— Cascade Output
In Single Filter Mode, COUT
11-0
is a
12-bit registered cascade output port.
COUT
11-0
should be connected to
DIN
11-0
of another LF3320. In Dual
Filter Mode, COUT
11-0
is a 12-bit
registered output port for the lower
twelve bits of the 16-bit Filter B output.
Video Imaging Products
2-3
08/16/2000–LDS.3320-N
LOGIC [ LOGIC DEVICES INCORPORATED ]
