LF3320
DEVICES INCORPORATED
Horizontal Digital Image Filter
SIGNALDEFINITIONS
Power
FIGURE 2. INPUT FORMATS
Input Data
Coefficient Data
VCC andGND
11 10 9
2
1
0
11 10 9
2
1
0
+3.3 V power supply. All pins must be
connected.
–211 210 29
22 21 20
–20 2–1 2–2
2–9 2–10 2–11
(Sign)
(Sign)
Clock
CLK — Master Clock
FIGURE 3. ACCUMULATOR OUTPUT FORMATS
Accumulator A Output Accumulator B Output
The rising edge of CLK strobes all
enabled registers.
31 30 29
2
1
0
31 30 29
2
1
0
Inputs
–220 219 218
2–9 2–10 2–11
–220 219 218
2–9 2–10 2–11
(Sign)
(Sign)
DIN11-0 — Data Input
DIN11-0 is the 12-bit data input port to
Filter A. In Dual Filter Mode, DIN11-0
can also be the 12-bit input port to
Filter B. Data is latched on the rising
edgeofCLK.
TABLE 1. OUTPUT FORMATS
SLCT4-0
00000
S15 S14 S13
· · ·
· · ·
· · ·
· · ·
S8
F8
S7
F7
F8
F9
· · ·
S2
F2
F3
F4
S1
F1
F2
F3
S0
F0
F1
F2
F15
F16
F17
F14
F15
F16
F13
F14
F15
· · ·
· · ·
· · ·
RIN11-0 — Reverse Cascade Input
00001
F9
In Single Filter Mode, RIN11-0 is the 12-
bit reverse cascade input port. This
port is connected to ROUT11-0 of
another LF3320. In Dual Filter Mode,
RIN11-0 can be the 12-bit input port to
Filter B. Data is latched on the rising
edgeofCLK.
00010
F10
·
·
·
· · ·
· · ·
· · ·
· ·
· ·
· ·
· · ·
· · ·
· · ·
01110
01111
10000
F29
F28
F29
F30
F27
· · ·
· · ·
· · ·
F22
F21
F22
F23
· · ·
· · ·
· · ·
F16
F15
F16
F17
F14
F30
F31
F28
F29
F23
F24
F17
F18
F15
F16
CFA11-0 — Coefficient A Input
CFA11-0 is used to load data into the
Filter A coefficient banks (banks 0
through 7) and the configuration/
control registers. Data present on
CFA11-0 is latched into the Filter A LF
InterfaceTM on the rising edge of CLK
when LDA is LOW (see the LF
InterfaceTM section for a full discus-
sion).
Outputs
DOUT15-0 — Data Output
CFB11-0 — Coefficient B Input
CFB11-0 is used to load data into the
Filter B coefficient banks (banks 8
through 15) and the configuration/
control registers. Data present on
CFB11-0 is latched into the Filter B LF
InterfaceTM on the rising edge of CLK
when LDB is LOW (see the LF
DOUT15-0 is the 16-bit registered data
output port for the overall filter (Single
Filter Mode) or Filter A (Dual Filter
Mode).
InterfaceTM section for a full discussion).
COUT11-0 — Cascade Output
CAA7-0 — Coefficient Address A
In Single Filter Mode, COUT11-0 is a
12-bit registered cascade output port.
COUT11-0 should be connected to
DIN11-0 of another LF3320. In Dual
Filter Mode, COUT11-0 is a 12-bit
registered outputportfor thelower
twelve bits ofthe 16-bit Filter Boutput.
CAA7-0 determines which row of data
in coefficient banks 0 through 7 is fed
to the multipliers. CAA7-0 is latched
into Coefficient Address Register A on
the rising edge of CLK when CENA is
LOW.
CAB7-0 — Coefficient Address B
CAB7-0 determines which row of data in
coefficient banks 8 through 15 is fed to the
multipliers. CAB7-0 is latched into
CoefficientAddressRegisterBon the
risingedgeofCLKwhen CENBisLOW.
Video Imaging Products
08/16/2000–LDS.3320-N
2-3
LOGIC [ LOGIC DEVICES INCORPORATED ]
