Texas Instruments TMS320DM646x manual Emulation Control Register Emcontrol

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Ethernet Media Access Controller (EMAC) Registers

5.31 Emulation Control Register (EMCONTROL)

The emulation control register (EMCONTROL) is shown in Figure 71 and described in Table 70.

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

5.32 FIFO Control Register (FIFOCONTROL)

The FIFO control register (FIFOCONTROL) is shown in Figure 72 and described in Table 71.

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.
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 ≥ TXCELLTHRESH ≤ 24).

114 Ethernet Media Access Controller (EMAC)/Management Data Input/Output (MDIO) SPRUEQ6–December 2007

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