Intel IXF1104 manual TX Fifo Register Overview, TX Fifo High Watermark Ports 0 3 $0x600

IXF1104 4-Port Gigabit Ethernet Media Access Controller

8.4.7TX FIFO Register Overview

Table 132 through Table 139 provide an overview of the TX FIFO registers, which include the TX FIFO High and Low watermark.

Table 132. TX FIFO High Watermark Ports 0 - 3 ($0x600 – 0x603)

Name	Description	Address	Type1	Default
	High watermark for TX FIFO Port 0. The
	default value of 0x3E0 represents 992 8-byte
	locations. This equates to 7936 bytes of data. A
TX FIFO High	unit entry in this register equates to 8 bytes of	0x600	R/W	0x000003E0
	data. When the amount of data stored in the TX
Watermark Port 0
	FIFO exceeds the high watermark, flow control
	is automatically initiated on the SPI3 interface to
	request that the switch fabric stops data
	transfers to avoid an overflow condition.
	High watermark for TX FIFO Port 1. The
	default value of 0x3E0 represents 992 8-byte
	locations. This equates to 7936 bytes of data. A
TX FIFO High	unit entry in this register equates to 8 bytes of
	data. When the amount of data stored in the TX	0x601	R/W	0x000003E0
Watermark Port 1
	FIFO exceeds the high watermark, flow control
	is automatically initiated on the SPI3 interface to
	request that the switch fabric stops data
	transfers to avoid an overflow condition.
	High watermark for TX FIFO Port 2. The
	default value of 0x3E0 represents 992 8-byte
	locations. This equates to 7936 bytes of data. A
TX FIFO High	unit entry in this register equates to 8 bytes of	0x602	R/W	0x000003E0
	data. When the amount of data stored in the TX
Watermark Port 2
	FIFO exceeds the high watermark, flow control
	is automatically initiated on the SPI3 interface to
	request that the switch fabric stops data
	transfers to avoid an overflow condition.
	High watermark for TX FIFO Port 3. The
	default value of 0x3E0 represents 992 8-byte
	locations. This equates to 7936 bytes of data. A
TX FIFO High	unit entry in this register equates to 8 bytes of
	data. When the amount of data stored in the TX	0x603	R/W	0x000003E0
Watermark Port 3
	FIFO exceeds the high watermark, flow control
	is automatically initiated on the SPI3 interface to
	request that the switch fabric stops data
	transfers to avoid an overflow condition.

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

202 Datasheet

Document Number: 278757

Revision Number: 007

Revision Date: March 25, 2004