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IXF1104 4-Port Gigabit Ethernet Media Access Controller
204 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
Table 134. TX FIFO MAC Threshold Register Ports 0 - 3 ($0x614 – 0x617)
Name Description Address Type
1
Default
TX FIFO MAC
Threshold Port 0
MAC threshold for TX FIFO Port 0. The
default value of 0x1BE represents 446 8-byte
locations. This equates to 3568 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 reaches this threshold, data is forwarded
to the MAC core and line-side interfaces for
onward transmission. By setting the threshold to
an appropriate value, the user can configure the
TX FIFO to operate in a “cut-through” mode
rather than the default “store and forward”
operation mode.
0x614 R/W 0x000001BE
TX FIFO MAC
Threshold Port 1
MAC threshold for TX FIFO Port 1. The
default value of 0x1BE represents 446 8-byte
locations. This equates to 3568 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 reaches this threshold, data is forwarded
to the MAC core and line-side interfaces for
onward transmission. By setting the threshold to
an appropriate value, the user can configure the
TX FIFO to operate in a “cut-through” mode
rather than the default “store and forward”
operation mode.
0x615 R/W 0x000001BE
TX FIFO MAC
Threshold Port 2
MAC threshold for TX FIFO Port 2. The
default value of 0x1BE represents 446 8-byte
locations. This equates to 3568 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 reaches this threshold, data is forwarded
to the MAC core and line-side interfaces for
onward transmission. By setting the threshold to
an appropriate value, the user can configure the
TX FIFO to operate in a “cut-through” mode
rather than the default “store and forward”
operation mode.
0x616 R/W 0x000001BE
TX FIFO MAC
Threshold Port 3
MAC threshold for TX FIFO Port 3. The
default value of 0x1BE represents 446 8-byte
locations. This equates to 3568 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 reaches this threshold, data is forwarded
to the MAC core and line-side interfaces for
onward transmission. By setting the threshold to
an appropriate value, the user can configure the
TX FIFO to operate in a “cut-through” mode
rather than the default “store and forward”
operation mode.
0x617 R/W 0x000001BE
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