lf3311 LOGIC Devices Incorporated, lf3311 Datasheet - Page 15

• Manufacturer Part Number: lf3311
• Description: Horizontal / Vertical Digital Image Filter
• Manufacturer: LOGIC Devices Incorporated

DEVICES INCORPORATED
LF Interface ™
Continued
Dimensionally
Seperate Mode
LOGIC Devices Incorporated
Functional Description
The horizontal coefficient banks may only be loaded with the Horizontal LF InterfaceTM and the vertical
coefficient banks may only be loaded with the Vertical LF InterfaceTM. The Configuration and Control
Registers may be loaded with either the Horizontal or Vertical LF InterfacesTM. Since both LF InterfacesTM
operate independently of each other, both LF InterfacesTM can load data into their respective coefficient
banks at the same time. Or, one LF InterfaceTM can load the Configuration/Control Registers while the
other loads it’s respective coefficient banks. If both LF InterfacesTM are used to load a configuration or
control register at the same time, the Vertical LF InterfaceTM will be given priority over the Horizontal LF
InterfaceTM. For example, if the Horizontal LF InterfaceTM attempts to load data into a Configuration
Register at the same time that the Vertical LF InterfaceTM attempts to load a horizontal round register, the
Vertical LF InterfaceTM will be allowed to load the round register while the Horizontal LF InterfaceTM will
not be allowed to load the Configuration Register. However, the Horizontal LF InterfaceTM will continue
to function as if the write occurred.
Operating Modes
In Dimensionally Separate Mode, the horizontal and vertical filters are cascaded together to form a two-
dimensional image filter (see Figures 14 and 15). Bit 1 in Configuration Register 4 determines the cascade
order. If this bit is set to “0”, data on DIN11-0 is fed into the horizontal filter first. The horizontal filter then
feeds data into the vertical filter. If this bit is set to “1”, data on DIN11-0 is fed into the vertical filter first. The
vertical filter then feeds data into the horizontal filter.
Figure 14. Dimensionally Seperate Mode: H to V
Figure 15. Dimensionally Seperate Mode: V to H
DIN
11-0
12
DIN
11-0
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
12
15
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
LINE BUFFER
Horizontal / Vertical Digital Image Filter
12
12
HORIZONTAL FILTER
HORIZONTAL FILTER
12
DOUT
12
Improved Performance
11-0
DOUT
Video Imaging Products
11-0
9/19/05 LDS.3311-C
LF3311