STV0118 datasheet(35/42 Pages) STMICROELECTRONICS

35 / 42 page

VI.2 - Register Contents and Description (continued)

(*) = DEFAULT mode when NRESET pin is active (LOW level)

VI - REGISTERS (continued)

REGISTER_9 - Status (read only)

MSB

LSB

Content

hok

atfr

buf2_free

buf1_free

fieldct2

fieldct1

fieldct0

jumping

hok

Hamming decoding of frame sync flag embedded within ITU-R656/D1 compliant YCrCb

streams.

(*)

Consecutive errors

A single or no error

Note :

signal quality detector is issued from Hamming decoding of EAV,SAVfrom YCrCb

atfr

Frame synchronization flag (slave mode only)

(*)

Encoder not synchronized

Encoder synchronized

(*)

buf2_free

Closed caption registers access condition for field 2

(refer to Functional Description, Section IV.13)

Closed caption data for field 2 is buffered before being output on the relevant TV line;

buf2_free is reset if the buffer is temporarily unavailable. If the microcontroller can

guaranteethat registers 41 and 42 (cccf2) are never written more than once between two

frame reference signals, then bit ‘buf2_free’ will always be true (set). Otherwise, closed

caption field2 registers access might be temporarily forbidden by resetting bit ‘buf2_free’

until the next field2 closed caption line occurs.

Note that this bit is false (reset) when 2 pairs of data bytes are awaiting to be encoded,

and is set back immediately after one of these pairs has been encoded (so at that

time,encoding of the last pair of bytes is still pending)

Reset value = 1 (access authorized)

(*)

buf1_free

Closed caption registers access condition for field 1

Same as buf2_free but concerns field 1.

Reset value = 1 (access authorized)

fieldct[2:0] Digital field identification number

000

...

111

Indicates field 1

Indicates field 8

fieldct[0] also represents the odd/even information (odd=’0’, even=’1’)

(*)

jumping

Indicates whether a frame length modification has been programmed at ‘1’ from

programming of bit ‘jump’ to end of frame(s) concerned.

Default = 0

Refer to register 6 and registers 21-22-23.

STV0118

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