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IXF1104 4-Port Gigabit Ethernet Media Access Controller
220 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
Table 152. Clock and Interface Mode Change Enable Ports 0 - 3 ($0x794)
Bit Name Description Type
1
Default
Register Description:
This register is used when a change to the operational mode or speed
of the IXF1104 is required. This register ensures that when a change is made that the internal
clocking of the IXF1104 is managed correctly and no unexpected effects of the operational or
speed change are observable on the line interfaces.
0x00000000
31:4 Reserved Reserved RO 0x0000000
3
Clock and Interface
Mode Change Enable
Port 3
2
Enables internal clock generator for Port 3 to
sample the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
0 = Set to zero when changes are being made to
the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
1 = Set to 1 for the configuration changes to take
effect.
R/W 0
2
Clock and Interface
Mode Change Enable
Port 2
2
Enables internal clock generator for Port 2 to
sample the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
0 = Set to zero when changes are being made to
the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
1 = Set to 1 for the configuration changes to take
effect.
R/W 0
1
Clock and Interface
Mode Change Enable
Port 1
2
Enables internal clock generator for Port 1 to
sample the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
0 = Set to zero when changes are being made to
the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
1 = Set to 1 for the configuration changes to take
effect.
R/W 0
0
Clock and Interface
Mode Change Enable
Port 0
2
Enables internal clock generator for Port 0 to
sample the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
0 = Set to zero when changes are being made to
the “MAC IF Mode and RGMII Speed ($
Port_Index + 0x10)" and the “Interface Mode
($0x501)".
1 = Set to 1 for the configuration changes to take
effect.
R/W 0
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
2. Refer to Section 6.1, “Change Port Mode Initialization Sequence” on page 129 for the proper sequence to
change the port mode and speed in conjunction with this register.