IP2022 Data Sheet www.ubicom.com 93 7.1.12    SxRCFG Register SERDES  RX  shift  count,  USB  sync  detect  and  data
polarity configuration. 7.1.13    SxRCNT Register SERDES RX activity configuration. 7 6 5 4 0 MASSEL   SYNCDETEN   RPOREV RXSCNT4:0 Name Description MASSEL 10Base-T mode: 0 =   Normal polarity detected 1 =   Reverse polarity detected GPSI or SPI mode: 0 =   Slave mode 1 =   Master mode SYNCDETEN     Synchronization byte detection enable (USB mode only) 0 =   Synchronization byte detec- tion enabled 1 =   Synchronization byte detec- tion disabled RPOREV Receive data polarity reversal select 0 =   Data polarity uninverted 1 =   Data polarity inverted RXSCNT4:0 Receive shift count, specifies number
of bits to receive 7 6 5 4 0 BITORDER  RxCRSED  RxCRS RXACNT4:0 Name Description BITORDER Bit order for transmit and receive 0 =   LSB first 1 =   MSB first RxCRSED Carrier sense interrupt control 10 =   Interrupt on carrier detection 11 =   Interrupt on loss of carrier RxCRS Carrier Sense Status: Current state
of carrier RXACNT4:0 Receive shift count, actual number
of bits received (read-only). Excep-
tions occur during the last transfer: RXACNT = 0 if bit count is
less than 8 RXACNT = 8 if bit count is
greater than or equal to 8, but
less than 16 RXACNT = 16 if bit count is
greater than or equal to 16
and the RXSCNT4:0 field in
the SxRCFG register is 16