STIR4200 SigmaTel, STIR4200 Datasheet - Page 11

• Manufacturer Part Number: STIR4200
• Description: USB / IrDA Bridge Controller
• Manufacturer: SigmaTel

3-4200-D1-2.0-0403
5.1.2.
FIR Transmit Frame
The FIR rate is 4 Mbps The frame organization is detailed in Figure 5.
Number of following bytes
MSB CRC
LSB CRC
MSB size
LSB size
0xAA
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7F
0x7E
0x7E
0x7E
0x7E
0x55
Data
Data
Data
Data
Data
Data
Data
‚‚‚
‚‚‚
‚‚‚
Header ID
PREAMBLE : These characters
cause the STIr4200S to generate the
preamble sequence used by the
receiving device for synchronization.
There must be exactly 16 characters.
BOF = Beginning of frame
Address/Control/Information Fields
Special characters must be escaped
FCS : 32 bit CRC-IEEE802
EOF - End of frame
Original Data
0x7D
0x7E
0x7F
USB/IrDA Bridge Controller
A
C
Escaped Data
0x7D 0x5D
0x7D 0x5E
0x7D 0x5F
I
STIr4200
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