Texas Instruments TMS320DM646x 사용자 설명서
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5.31 Emulation Control Register (EMCONTROL)
5.32 FIFO Control Register (FIFOCONTROL)
Ethernet Media Access Controller (EMAC) Registers
The emulation control register (EMCONTROL) is shown in
and described in
Figure 71. Emulation Control Register (EMCONTROL)
31
16
Reserved
R-0
15
2
1
0
Reserved
SOFT
FREE
R-0
R/W-0
R/W-0
LEGEND: R = Read only; R/W = Read/Write; -n = value after reset
Table 70. Emulation Control Register (EMCONTROL) Field Descriptions
Bit
Field
Value
Description
31-2
Reserved
0
Reserved
1
SOFT
0-1
Emulation soft bit
0
FREE
0-1
Emulation free bit
The FIFO control register (FIFOCONTROL) is shown in
and described in
.
Figure 72. FIFO Control Register (FIFOCONTROL)
31
23
22
16
Reserved
RXFIFOFLOWTHRESH
R-0
R/W-2h
15
5
4
0
Reserved
TXCELLTHRESH
R-0
R/W-18h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 71. FIFO Control Register (FIFOCONTROL) Field Descriptions
Bit
Field
Value
Description
31-23
Reserved
0
Reserved
22-16
RXFIFOFLOWTHRESH
0-3Fh
Receive FIFO flow control threshold. Occupancy of the receive FIFO when receive
FIFO flow control is triggered (if enabled). The default value is 2h, which means that
receive FIFO flow control is triggered when the occupancy of the FIFO reaches 2 cells.
FIFO flow control is triggered (if enabled). The default value is 2h, which means that
receive FIFO flow control is triggered when the occupancy of the FIFO reaches 2 cells.
15-5
Reserved
0
Reserved
4-0
TXCELLTHRESH
0-1Fh
Transmit FIFO cell threshold. Indicates the number of 64-byte packet cells required to
be in the transmit FIFO before the packet transfer is initiated. Packets with fewer cells
are initiated when the complete packet is contained in the FIFO. This value must be
greater than or equal to 2 and less than or equal to 24 (2
be in the transmit FIFO before the packet transfer is initiated. Packets with fewer cells
are initiated when the complete packet is contained in the FIFO. This value must be
greater than or equal to 2 and less than or equal to 24 (2
≥
TXCELLTHRESH
≤
24).
114
Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO)
SPRUEQ6 – December 2007