TMC2192 datasheet(11/69 Pages) CADEKA

11 / 69 page

PRODUCT SPECIFICATION

TMC2192

REV. 1.0.0 8/13/03

Blanking Control

Control Registers for this section

The content of VBIENFx[4:0] selects the ﬁrst line to contain

an active video region in each ﬁeld, all subsequent lines for

the remainder of the ﬁeld are active. To blank an entire ﬁeld,

the user zeroes the VBIENFx[4:0] control register. In

CCIR656 slave mode, the user can selectively blank any

enabled line by setting its TRS V bit HIGH. For 525-line

systems, NTSC line numbering is employed, with the ﬁrst

vertical serration starting on line 4. PAL line numbering is

used with 625-line systems, with each ﬁeld's line 1 being the

start of the ﬁrst vertical serration.

Any line(s) enabled by the closed caption control are auto-

matically unblanked for the closed caption waveform, irre-

spective of the corresponding values of VBIENF.

Pixel Data Control

The pixel data control has two modes of operation, as an

input or as an output. The mode of operation is determined

by the PDCDIR control register. When PDC is an input the

internally generated PDC is ANDed with the PDC pin. This

allows the user to blank any active video regions. When PDC

is an output, the internally generated PDC is the output for

the PDC pin.

The internal PDC control will toggle to a logic HIGH at the

pixel speciﬁed by PDCNT and toggle to a logic LOW four

pixels prior to the end of the active video region. The starting

point and ending point of the active video region (VA) are

determined by the control registers 10h to 1Fh. When PDC is

used as an input, the sloped edge of the active video region

will occur on the next four pixels following the toggle point.

Edge Shaping

The TMC2192 has three modes of sloped edges on the active

video region and are controlled by PDRM control register.

Address

Bit(s)

Name

0x04

1-0

PDRM

0x06

PDCDIR

0x18

4-0

VBIENF1

0x19

4-0

VBIENF2

0x1F

7-0

PDCCNT

Table 3. PDC Edge Control

PDRM[1:0]

Slope type at PDC (HIGH)

Slope type at PDC (LOW)

The following four pixels have the weighting of

1/8, 1/2, 7/8 and 1 for NTSC and 1/8, 3/8, 5/8,

and 7/8 for PAL.

The following four pixels have the weighting of

1, 7/8, 1/2, and 1/8 for NTSC and 7/8, 5/8, 3/8,

and 1/8 for PAL.

The fifth pixel is sampled and scaled 1/8, 1/2,

7/8 and 1 over the next four pixels for NTSC

and 1/8, 3/8, 5/8, and 7/8 over the next four

pixels for PAL.

The fifth pixel s sampled and scaled 1, 7/8, 1/2

and 1/8 over the next four pixels for NTSC and

7/8, 5/8, 3/8, and 1/8 over the next four pixels

for PAL.

Slope is off, edge control is dictated by the PD

stream from active video start

Slope is off, edge control is dictated by the PD

stream to active video end

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