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IXF1104 4-Port Gigabit Ethernet Media Access Controller
Datasheet 165
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
Table 80. Pause Threshold ($ Port_Index + 0x0E)
Name Description Address Type
1
Default
Pause
Threshold
When a pause frame has been sent, an internal
timer checks when the next pause frame must
be scheduled for transmission to keep the link
partner in pause mode (this is required only if
the flow control has to be extended for one more
session). The pause threshold value is a 16-bit
value that sets the time in terms of 512-bit
quantum after the previous pause frame when
the next pause frame has to be sent. This
ensures that the link partner is kept in pause
mode continuously.
Port_Index
+ 0x0E
R/W 0x0000002F
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 81. Max Frame Size (Addr: Port_Index + 0x0F)
Name Description Address Type
1
Default
Max Frame Size
This is a 14-bit value configuring the maximum
frame size the MAC can receive or transmit
without activating any error counters, and
without truncation.
This value is excluding the 4-byte CRC in the
transmit direction when CRC append is
enabled in the MAC. Hence, this value has to
be set four bytes less when CRC append is
enabled in the MAC.
The maximum frame size is internally adjusted
by +4 if the frame is VLAN tagged.
Port_Inde
x + 0x0F
R/W 0x000005EE
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