参数资料
型号: IXF1010
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 10 CHANNEL(S), 1000M bps, LOCAL AREA NETWORK CONTROLLER, CBGA552
封装: 25 X 25 MM, 1 MM PITCH, CERAMIC, BGA-552
文件页数: 49/116页
文件大小: 1392K
代理商: IXF1010
IXF1010 — 10-Port 100/1000 Mbps Ethernet MAC
38
Preliminary Datasheet
Document #: 249839
Revision #: 001
Rev. Date: April 29, 2002
3.4.5.2
MDC Low-Frequency Operation
The low-frequency MDC is 2.5 MHz, which is derived from the 125 MHz system clock by
dividing the frequency by 50.
The duty cycle is as follows:
MDC High duration: 25 x (1/125 MHz) = 25 x 8 ns = 200 ns
MDC Low duration: 25 x (1/125 MHz) = 25 x 8 ns = 200 ns
MDC runs continuously after reset
3.4.6
MDIO Management Frames
The MDIO Management interface serializes the external register access information into the
format specified by IEEE 802.3, Clause 22, Section 2.4.5.
Figure 11. High-Frequency MDC Timing Diagram
24 ns
(3 X 125 MHz clocks)
32 ns
(4 X 125 MHz clocks)
MDC
Internal
125 MHz Clock
Figure 12. Low-Frequency MDC Timing Diagram
Internal 125 MHz
Clock
MDC
200 ns
(25 X 125 MHz Clocks)
200 ns
(25 X 125 MHz Clocks)
Figure 13. MDIO Management Frame Structure
Preamble
32 Bits
Start
2 Bits
Op Code
2 Bits
PHY Addr
5 Bits
Turnaround
2 Bits
Data
16 Bits
First Bit Transmitted
Last Bit Transmitted
REG Addr
5 Bits
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