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IXF1104 4-Port Gigabit Ethernet Media Access Controller
192 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
8.4.6 RX 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 Type
1
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
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.
0x0E6
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO High
Watermark Port 0
The high water mark value.
NOTE: Must be greater than the RX FIFO Low
Watermark and RX FIFO transfer threshold.
R/W 0x0E6
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 Type
1
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
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.
0x0E6
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO High
Watermark Port 1
The high water mark value.
NOTE: Must be greater than the RX FIFO Low
Watermark and RX FIFO transfer threshold.
R/W 0x0E6
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 Type
1
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
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.
0x0E6
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO High
Watermark Port 2
The high water mark value.
NOTE: Must be greater than the RX FIFO Low
Watermark and RX FIFO transfer threshold.
R/W 0x0E6
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