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IXF1104 4-Port Gigabit Ethernet Media Access Controller
Datasheet 193
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
Table 116. RX FIFO High Watermark Port 3 ($0x583)
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 3
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 117. RX FIFO Low Watermark Port 0 ($0x58A)
Bit Name Description Type
1
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
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
0x072
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO Low
Watermark Port 0
The High Watermark value
NOTE: Should never be greater or equal to the
High Watermark.
R/W 0x072
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 Type
1
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
automatically de-asserted within the MAC to allow more line-side data to be captured by the
RX FIFO.
0x072
31:12 Reserved Reserved RO 0x00000
11: 0
RX FIFO Low
Watermark Port 1
The High Watermark value
NOTE: Should never be greater or equal to the
High Watermark.
R/W 0x072
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