Rainbow Electronics DS31256 - Manual (Page 73)

DS31256
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Bits 8 to 11/Transmit Flag Generation Bits 0 to 3 (TFG0/TFG1/TFG2/TFG3). These four bits determine how
many flags and interfill bytes are sent between consecutive packets.
TFG3 TFG2 TFG1 TFG0 ACTION
0 0 0 0 Share closing and opening flag
0 0 0 1 Closing flag/no interfill bytes/opening flag
0 0 1 0 Closing flag/1 interfill byte/opening flag
0 0 1 1 Closing flag/2 interfill bytes/opening flag
0 1 0 0 Closing flag/3 interfill bytes/opening flag
0 1 0 1 Closing flag/4 interfill bytes/opening flag
0 1 1 0 Closing flag/5 interfill bytes/opening flag
0 1 1 1 Closing flag/6 interfill bytes/opening flag
1 0 0 0 Closing flag/7 interfill bytes/opening flag
1 0 0 1 Closing flag/8 interfill bytes/opening flag
1 0 1 0 Closing flag/9 interfill bytes/opening flag
1 0 1 1 Closing flag/10 interfill bytes/opening flag
1 1 0 0 Closing flag/11 interfill bytes/opening flag
1 1 0 1 Closing flag/12 interfill bytes/opening flag
1 1 1 0 Closing flag/13 interfill bytes/opening flag
1 1 1 1 Closing flag/14 interfill bytes/opening flag
Bit 12/Transmit Zero Stuffing Disable (TZSD). When this bit is set low, the HDLC engine performs zero
stuffing on the outgoing data stream. When this bit is set high, the outgoing data stream is not zero stuffed. This
bit is ignored when the HDLC engine is configured in the transparent mode (TTRANS = 1).