IP2022 User’s Manual—Peripherals www.ubicom.com 279 4.6.4 SxSYNCMASK Register 10Base-T mode: USB mode: 7 6 3 2 1 0 Reserved PREAMCNT3:0 Reserved   CONTPAIR   Reserved 7 0 MASK7:0 Name Description PREAMCNT3:0 Preamble pair count (10Base-T mode only). All other
encodings are reserved. 0000 =    24 pairs
0001 =    20 pairs
0010 =    16 pairs
0011 =    12 pairs
0100 =    8 pairs
0101 =    4 pairs MASK7:0 Mask bits for SxRSYNC (USB mode only) 0 =    Ignore corresponding bit in SxRSYNC
1 =    Use corresponding bit in search pattern for syn- chronization byte