Datasheet

TVP5151

SLES241E–SEPTEMBER 2009–REVISED OCTOBER 2011

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3.21.65 VDP Status Register

Address C6h

7 6 5 4 3 2 1 0

FIFO full error FIFO empty TTX available CC field 1 CC field 2 WSS available VPS available VITC available

available available

The VDP status register indicates whether data is available in either the FIFO or data registers, and status

information about the FIFO. Reading data from the corresponding register does not clear the status flags

automatically. These flags are only reset by writing a 1 to the respective bit. However, bit 6 is updated

automatically.

FIFO full error

0 = No FIFO full error

1 = FIFO was full during a write to FIFO.

The FIFO full error flag is set when the current line of VBI data can not enter the FIFO. For example, if

the FIFO has only ten bytes left and teletext is the current VBI line, the FIFO full error flag is set, but no

data is written because the entire teletext line does not fit. However, if the next VBI line is closed

caption requiring only two bytes of data plus the header, this goes into the FIFO, even if the full error

flag is set.

FIFO empty

0 = FIFO is not empty.

1 = FIFO is empty.

TTX available

0 = Teletext data is not available.

1 = Teletext data is available.

CC field 1 available

0 = Closed caption data from field 1 is not available.

1 = Closed caption data from field 1 is available.

CC field 2 available

0 = Closed caption data from field 2 is not available.

1 = Closed caption data from field 2 is available.

WSS available

0 = WSS data is not available.

1 = WSS data is available.

VPS available

0 = VPS data is not available.

1 = VPS data is available.

VITC available

0 = VITC data is not available.

1 = VITC data is available.

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