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Intel
®
IXP42X product line and IXC1100 control plane processors—Ethernet MAC A
Intel
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
DM September 2006
442 Order Number: 252480-006US
15.2.38 Threshold for Internal Clock
15.2.39 Unicast Address Registers
Six registers that make up the 48 bit Unicast Address are:
• Unicast Address[47:40] — Unicast Address 1
• Unicast Address[39:32] — Unicast Address 2
• Unicast Address[31:24] — Unicast Address 3
• Unicast Address[23:16] — Unicast Address 4
• Unicast Address[15:8] — Unicast Address 5
• Unicast Address[7:0] — Unicast Address 6
Example: Unicast Address is 00-A0-24-D1-7F-02
• Unicast Address 1 = 0x00
• Unicast Address 2 = 0xA0
• Unicast Address 3 = 0x24
• Unicast Address 4 = 0xD1
• Unicast Address 5 = 0x7F
• Unicast Address 6 = 0x02
The detailed bit descriptions follow the six registers’ bit maps.
Register Name: thresh_intclk
Hex Offset Address: 0xC80090E0 Reset Hex Value: 0x00000000
Register
Description:
Threshold for Internal Clock Register
Access: Read/Write.
31 87 0
(Reserved) CLOCK RATIO
Register thresh_intclk
Bits Name Description
31:8 (Reserved)
7:0 Clock ratio
Holds ratio of PHY side clock (tx_clk or rx_clk) to sys_clk. PHY side clock
frequency/application clock frequency. Round up for value to be written to this
register.
Example: 25 MHz PHY clock, 133 MHz application clock — Sets this register to
1. Any application, clock frequency greater than the tx_clk or rx_clk frequency
will have a clock ratio of 1. Always set to 1 for the Intel
®
IXP42X product line
and IXC1100 control plane processors.