STA015 datasheet(39/55 Pages) STMICROELECTRONICS

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STA015 STA015B STA015T

hancement is going to perform.

For example, in case of a 0 dB signal (max. level) only attenuation would be possible. If enhancement is

desired, the signal has to be attenuated accordingly before in order to reserve a margin in dB.

An increment of a decimal unit corresponds to a Tone Attenuation step of 1.5dB.

ANCILLARY DATA BUFFER

Address: 0x7E - 0xB5 (126 - 181)

Type: RO

Software Reset: 0x00

Hardware Reset: 0x00

The STA015 contains 56 consecutive 8-bit registers corresponding to the maximum number of ancillary

data that may be contained in MPEG frame.

The ANCCOUNT_L and ANCOUNT_H registers contain the number of ancillary data bits available within

the current MPEG frame.

To perform ancillary data reading a status register (0xB6 - INTERRUPT_STATUS_REGISTER) is avail-

able: bit 0 of this register should be polled by the microcontroller in order to understand when new data

are available.

ISR

Address: 0xB6 (182)

Type: R/W

Software Reset: 0x00

MSB

LSB

ATTENUATION

1.5dB step

0000

000

0dB

0000

001

-1.5dB

0001

010

3dB

0000

011

4.5dB

0001

010

-15

0001

011

-16.5

0001

100

-18

0x7E

ANC_DATA_1

.......

0xB5

ANC_DATA_56

0xB6

ISR

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