TMC2192 datasheet(24/69 Pages) CADEKA

24 / 69 page

TMC2192

PRODUCT SPECIFICATION

REV. 1.0.0 8/13/03

Enabling the pedestal on line 25 enables it for the remainder

of ﬁeld 1, to line 262. Likewise, enabling the pedestal on line

288 enables it for the remainder of ﬁeld 2.

Pedestal Height

PEDHGT1 determines the height of the pedestal for the

luminance channel on the composite path. The range of the

pedestal height is from -22.1 to 21.74 IRE in .345 IRE incre-

ments.

Sync and Blank Insertion

The composite paths blank and sync D/A codes are deter-

mined by the FORMAT control register. For NTSC and

PAL-M formats the blank D/A code is 240 (295 mV) and the

sync D/A code is 8 (9 mV). For all other PAL formats the

blank D/A code is 256 (314 mV) and the sync D/A code is

12 (14 mV).

In all cases the sync edges are sloped to insure the proper rise

and fall times in all video standards.

Closed Caption Insertion

Control Registers for this section

The TMC2192 includes a ﬂexible closed-caption processor.

It may be programmed to insert a closed caption signal on

any line within a range of 16 lines on ODD and/or EVEN

ﬁelds. Closed Caption insertion overrides all other conﬁgura-

tions of the encoder: if it is speciﬁed on an active video line,

it takes precedence over the video data and removes NTSC

setup if setup has been programmed for the active video

lines. Closed Caption is only available when the TMC2192

is in a 13.5 MHz pixel rate.

Closed caption is turned on by setting CCON HIGH. When-

ever the encoder begins producing a line speciﬁed by

CCFLD and CCLINE, it will insert a closed caption line in

its place. If CCRTS is HIGH, the data contained in CCDx

will be sent. IF CCRTS is LOW, Null bytes (hex 00 with

ODD parity) will be sent.

Line Selection

The line to contain CC data is selected by a combination of

the CCFLD bit and the CCLINE bits. CCLINE is added to

the offset shown in Table 16 to specify the line.

Parity Generation

Standard Closed-Caption signals employ ODD parity, which

may be automatically generated by setting CCPAR HIGH.

Alternatively, parity may be generated externally as part of

the bytes to be transmitted, and, with CCPAR LOW, the

entire 16 bits loaded into the CCDx registers will be sent

unchanged.

Operating Sequence

A typical operational sequence for closed-caption insertion

on line xx is:

Read Register 1E and check that bit 7 is LOW, indicat-

ing that the CCDx registers are ready to accept data.

If ready, write two bytes of CC data into registers 1C

and 1D.

Write into register 1E the proper combination of

CCFLD and CCLINE. CCPAR may be written as

desired. Set CCRTS HIGH.

The CC data is transmitted during the speciﬁed line.

As soon as CCDx s transferred into the CC processor (and

CCRTS goes LOW), new data may be loaded into registers

1C and 1D. This allows the user to transmit CC data on sev-

eral consecutive lines by loading data for line n+1 while data

is being sent on line n.

Address

Bit(s)

Name

0x1C

7-6

CCD1

0x1D

1-0

CCD2

0x1E

CCON

0x1E

CCRTS

0x1E

CCPAR

0x1E

CCFLD

0x1E

3–0

CCLINE

Table 13. Closed Caption Line Selection

Standard

Offset

Field

Lines

525

ODD

12-27

274

EVEN

274-289

625

ODD

16-31

328

EVEN

328-343

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