Texas Instruments TMS320C645x DSP manual Cmdidle, Txptype, Gig, Txpace, Gmiien, Txflowen, Flowen

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EMAC Port Registers

Table 57. MAC Control Register (MACCONTROL) Field Descriptions (continued)

Bit	Field	Value	Description
		1	Receive flow control enabled. For full-duplex mode, outgoing pause frames are sent when
			receive FIFO flow control is triggered.
11	CMDIDLE		Command Idle bit
		0	Idle not commanded
		1	Idle commanded (read IDLE in the MACSTATUS register)
10	Reserved	0	Reserved
9	TXPTYPE		Transmit queue priority type
		0	The queue uses a round-robin scheme to select the next channel for transmission
		1	The queue uses a fixed-priority (channel 7 highest priority) scheme to select the next channel
			for transmission
8	Reserved	0	Reserved
7	GIG		Gigabit mode
		0	Gigabit mode is disabled; 10/100 mode is in operation
		1	Gigabit mode is enabled (full-duplex only)
6	TXPACE		Transmit pacing enable bit
		0	Transmit pacing is disabled
		1	Transmit pacing is enabled
5	GMIIEN		GMII enable bit
		0	GMII RX and TX are held in reset
		1	GMII RX and TX are enabled for receive and transmit
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	RXBUFFER		Receive buffer flow control enable bit
	FLOWEN	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 de-asserted.
		0	Loopback mode is disabled
		1	Loopback mode is enabled
0	FULLDUPLEX		Full duplex mode. The gigabit mode forces full duplex mode regardless of whether the
			FULLDUPLEX bit is set or not.
		0	Half-duplex mode is enabled
		1	Full-duplex mode is enabled

114 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) SPRU975B –August 2006

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