Intel IXF1104 manual 8.4.6RX FIFO Register Overview, Datasheet

IXF1104 4-Port Gigabit Ethernet Media Access Controller

8.4.6RX FIFO Register Overview

Table 113 through Table 131 provide an overview of the RX FIFO registers, which include the RX FIFO High and Low watermarks.

Table 113. RX FIFO High Watermark Port 0 ($0x580)

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 0
		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 114. RX FIFO High Watermark Port 1 ($0x581)

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 1
		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 115. RX FIFO High Watermark Port 2 ($0x582)

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 2
		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

192 Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004