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EMAC Module Registers
Table 66. MAC Control Register (MACCONTROL) Field Descriptions (continued)
Bit Field Value Description
4 TXFLOWEN Transmit flow control enable bit. This bit determines if incoming pause frames are acted upon
in full-duplex mode. Incoming pause frames are not acted upon in half-duplex mode,
regardless of this bit setting. The RXMBPENABLE bits determine whether or not received
pause frames are transferred to memory.
0 Transmit flow control is disabled. Full-duplex mode: incoming pause frames are not acted
upon.
1 Transmit flow control is enabled. Full-duplex mode: incoming pause frames are acted upon.
3 RXBUFFERFLOWEN Receive buffer flow control enable bit
0 Receive flow control is disabled. Half-duplex mode: no flow control generated collisions are
sent. Full-duplex mode: no outgoing pause frames are sent.
1 Receive flow control is enabled. Half-duplex mode: collisions are initiated when receive buffer
flow control is triggered. Full-duplex mode: outgoing pause frames are sent when receive flow
control is triggered.
2 Reserved 0 Reserved
1 LOOPBACK Loopback mode. The loopback mode forces internal full-duplex mode regardless of the
FULLDUPLEX bit. The loopback bit should be changed only when GMIIEN bit is deasserted.
0 Loopback mode is disabled.
1 Loopback mode is enabled.
0 FULLDUPLEX Full duplex mode.
0 Half-duplex mode is enabled.
1 Full-duplex mode is enabled.
111
SPRUFL5B–April 2011 EMAC/MDIO Module
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