Intel IXF1104 manual RX Fifo High Watermark Port 3 $0x583, RX Fifo Low Watermark Port 0 $0x58A

IXF1104 4-Port Gigabit Ethernet Media Access Controller

Table 116. RX FIFO High Watermark Port 3 ($0x583)

Bit	Name	Description	Type1	Default
Register Description: The default value of 0x0E6 represents 230 eight-byte locations. This
equates to 1840 bytes of data. A unit entry in this register equates to 8 bytes of data. When the				0x0E6
amount of data stored in the RX FIFO exceeds the high watermark, flow control is
automatically initiated within the MAC to avoid an overflow condition.
31:12	Reserved	Reserved	RO	0x00000
	RX FIFO High	The high water mark value.
11: 0		NOTE: Must be greater than the RX FIFO Low	R/W	0x0E6
	Watermark Port 3
		Watermark and RX FIFO transfer threshold.

1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No clear; R/W/C = Read/Write, Clear on Write

Table 117. RX FIFO Low Watermark Port 0 ($0x58A)

Bit	Name	Description	Type1	Default
Register Description: The default value of 0x072 represents 114 eight-byte locations. This
equates to 912 bytes of data. A unit entry in this register equates to 8 bytes of data. When the
amount of data stored in the RX FIFO falls below the Low Watermark, flow control is				0x072
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
31:12	Reserved	Reserved	RO	0x00000
	RX FIFO Low	The High Watermark value
11: 0		NOTE: Should never be greater or equal to the	R/W	0x072
	Watermark Port 0
		High Watermark.

1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No clear; R/W/C = Read/Write, Clear on Write

Table 118. RX FIFO Low Watermark Port 1 ($0x58B)

Bit	Name	Description	Type1	Default
Register Description: The default value of 0x072 represents 114 eight-byte locations. This
equates to 912 bytes of data. A unit entry in this register equates to 8 bytes of data. When the
amount of data stored in the RX FIFO falls below the Low Watermark, flow control is				0x072
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
31:12	Reserved	Reserved	RO	0x00000
	RX FIFO Low	The High Watermark value
11: 0		NOTE: Should never be greater or equal to the	R/W	0x072
	Watermark Port 1
		High Watermark.

1. RO = Read Only, No clear on Read; R = Read, Clear on Read; W = Write only; R/W = Read/Write, No clear; R/W/C = Read/Write, Clear on Write

Datasheet 193

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004