LRIS64K datasheet(31/100 Pages) STMICROELECTRONICS

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LRIS64K

LRIS64K to VCD frames

Doc ID 15336 Rev 11

31/100

LRIS64K to VCD frames

Frames are delimited by an SOF and an EOF. They are implemented using code violation.

Unused options are reserved for future use. For the low data rate, the same subcarrier

frequency or frequencies is/are used. In this case the number of pulses is multiplied by 4.

For the Fast commands using one subcarrier, all pulse numbers and times are divided by 2.

10.1

SOF when using one subcarrier

10.2

High data rate

The SOF includes an unmodulated time of 56.64 µs, followed by 24 pulses at 423.75 kHz

(fC/32), and a logic 1 that consists of an unmodulated time of 18.88 µs followed by 8 pulses

at 423.75 kHz as shown in Figure 24.

Figure 24.

Start of frame, high data rate, one subcarrier

For the Fast commands, the SOF comprises an unmodulated time of 28.32 µs, followed by

12 pulses at 423.75 kHz (fC/32), and a logic 1 that consists of an unmodulated time of

9.44µs followed by 4 pulses at 423.75 kHz as shown in Figure 25.

Figure 25.

Start of frame, high data rate, one subcarrier x2

10.3

Low data rate

The SOF comprises an unmodulated time of 226.56 µs, followed by 96 pulses at 423.75 kHz

(fC/32), and a logic 1 that consists of an unmodulated time of 75.52 µs followed by 32 pulses

at 423.75 kHz as shown in Figure 26.

Figure 26.

Start of frame, low data rate, one subcarrier

113.28µs

ai12078

37.76µs

56.64µs

ai12079

18.88µs

453.12µs

ai12080

151.04µs

LRIS64K Datasheet(PDF) 31 Page - STMicroelectronics