SDA5648 Просмотр технического описания (PDF) - Siemens AG

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SDA5648

Decoder for Program Delivery Control and Video Program System PDC / VPS Decoder

Siemens AG 

SDA 5648

SDA 5648X

BDSP 8/30 Format 1 Bit Allocation

Byte No. Bit No.

01234567

15

Weight

Weight

Sign

2 – 2 2 – 1 2 0 21 22 23 0

1

Contents

Time Offset Code

16

MJD Digit

Weight 104

1111

Modified Julian Date (MJD)

1. Byte

17

MJD Digit

Weight 102

MJD Digit

Weight 103

Modified Julian Date

2. Byte

18

MJD Digit

Weight 100

MJD Digit

Weight 101

Modified Julian Date (MJD)

3. Byte

19

UTC Hours

Units

UTC Hours

Tens

Universal Time Coordinated (UTC)

1. Byte

20

UTC Minutes

UTC Minutes

Units

Tens

Universal Time Coordinated

2. Byte

21

UTC Seconds

UTC Seconds

Units

Tens

Universal Time Coordinated

3. Byte

This corresponds to the coding adopted in CCIR teletext system B BDSP 8/30 format 1.

NB: The received bytes are output on the I2C-bus in a transparent way, i.e., on a bit-first-in-first-out

basis. No bit manipulation is performed on the chip in this operating mode. When evaluating the

numbers, note that each 4-bit-digit has been incremented by one prior to transmission, and the least

significant bits are transmitted first.

Semiconductor Group

40

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