Texas Instruments TMS320C645x DSP User Manual
Page 114
www.ti.com
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
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)
114
SPRU975B – August 2006