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IXF1104 4-Port Gigabit Ethernet Media Access Controller
202 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
8.4.7 TX 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 Type
1
Default
TX FIFO High
Watermark Port 0
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
unit entry in this register equates to 8 bytes of
data. When the amount of data stored in the TX
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.
0x600 R/W 0x000003E0
TX FIFO High
Watermark Port 1
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
unit entry in this register equates to 8 bytes of
data. When the amount of data stored in the TX
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.
0x601 R/W 0x000003E0
TX FIFO High
Watermark Port 2
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
unit entry in this register equates to 8 bytes of
data. When the amount of data stored in the TX
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.
0x602 R/W 0x000003E0
TX FIFO High
Watermark Port 3
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
unit entry in this register equates to 8 bytes of
data. When the amount of data stored in the TX
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.
0x603 R/W 0x000003E0
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