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Bit-Rate Devices
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7.3 Bit-Rate Devices
ThunderLAN supports bit-rate devices by asserting the BITrate bit in the Net-
Config register. The MII is then converted into an Ethernet serial network inter-
face (SNI). The pin conversion for this mode is:
MRXD0 → RXD (receive data)
MRCLK → RXC (receive clock)
MRCLK → RXC (receive clock)
MCRS → CRS (carrier sense)
MTCLK → TXC (transmit clock)
MTXD0 → TXD (transmit data)
MTXEN → TXE (transmit enable)
MCOL → COL (collision detect)
MTXD3, MTXD2, MTXD1, and MTXER are driven with the values in the low
nibble (bits 0–3) of the Acommit register. These signals can be used to drive
PHY option pins, such as loopback or unshielded twisted pair/attachment unit
interface (UTP/AUI) select.