LF3321 datasheet(22/28 Pages) LODEV

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DEVICES INCORPORATED

LF3321

Horizontal Digital Image Filter

Improved Performance

LOGIC Devices Incorporated

Feb 5, 2003 LDS.3321-A

Video Imaging Products

DOUT15-0 — Data Output

DOUT15-0 is the 16-bit registered data output port for the overall filter (Single Filter Mode) or Filter A

(Dual Filter Mode).

COUT11-0 — Cascade Output

In Single Filter Mode, COUT11-0 is a 12-bit registered cascade output port. COUT11-0 should be

connected to DIN11-0 of another LF3321. In Dual Filter Mode, COUT11-0 is a 12-bit registered output port

for the lower twelve bits of the 16-bit Filter B output.

ROUT11-0 — Reverse Cascade Output

In Single Filter Mode, ROUT11-0 is a 12-bit registered cascade output port. ROUT11-0 on one device

should be connected to RIN11-0 of another LF3321. In Dual Filter Mode, ROUT3-0 is a 4-bit registered

output port for the upper four bits of the 16-bit Filter B output. In this mode, ROUT11-4 is disabled.

LDA — Coefficient A Load

When LDA is LOW, data on CFA11-0 is latched into the Filter A LF InterfaceTM on the rising edge of CLK.

When LDA is HIGH, data is not loaded into the Filter A LF InterfaceTM. When enabling the LF InterfaceTM for

data input, a HIGH to LOW transition of LDA is required in order for the input circuitry to function properly.

Therefore, LDA must be set HIGH immediately after power up to ensure proper operation of the input

circuitry (see the LF InterfaceTM section for a full discussion).

CENA — Coefficient Address Enable A

When CENA is LOW, data on CAA7-0 is latched into Coefficient Address Register A on the rising edge

of CLK. When CENA is HIGH, data on CAA7-0 is not latched and the register’s contents will not be

changed.

LDB — Coefficient B Load

When LDB is LOW, data on CFB11-0 is latched into the Filter B LF InterfaceTM on the rising edge of CLK.

When LDB is HIGH, data is not loaded into the Filter B LF InterfaceTM. When enabling the LF InterfaceTM for

data input, a HIGH to LOW transition of LDB is required in order for the input circuitry to function properly.

Therefore, LDB must be set HIGH immediately after power up to ensure proper operation of the input

circuitry (see the LF InterfaceTM section for a full discussion).

Signal Definitions

Controls

Outputs

Table 20. Output Formats

SLCT4-0

S15

S14

S13

· · ·

00000

F15

F14

F13

· · ·

00001

F16

F15

F14

· · ·

00010

F17

F16

F15

· · ·

F10

· · ·

01110

F29

F28

F27

· · ·

F22

F21

· · ·

F16

F15

F14

01111

F30

F29

F28

· · ·

F23

F22

· · ·

F17

F16

F15

10000

F31

F30

F29

· · ·

F24

F23

· · ·

F18

F17

F16

LF3321 Datasheet(PDF) 22 Page - LOGIC Devices Incorporated

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