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| 型號(hào)： | 4450HG/3-K |
| 廠商： | EXAR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MICROPROCESSOR, PBGA324 |
| 封裝： | ROHS COMPLIANT, HSBGA-324 |
| 文件頁(yè)數(shù)： | 27/92頁(yè) |
| 文件大小： | 780K |
| 代理商： | 4450HG/3-K |
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4450 – Data Sheet, DS-0131-06
Page 33
Hifn Confidential
6.2 Ethernet Interfaces Signal Description
The 4450 is normally located in a system between a copper or fiber PHY and a Host's
GMAC. The network side of the 4450 functions like a MAC device and the host side
functions like a PHY. The host side interface provides six separate electrical signalling
options which include: GMII/TBI, RGMII/RTBI, SGMII, and SERDES. For the network side
interfaces, only RGMII/RTBI, SGMII and SERDES signalling options are available. GMII/TBI
signalling is not supported on the network side. The GMAC interfaces are capable of running
at 10/100/1000 speeds in either the GMII, RGMII or SGMII modes. The TBI, RTBI and
SERDES interfaces only support 1 Gbps speeds and will not run at 10/100 speeds. Note that
the 4450 is not designed to operate in asymmetric rate scenarios where for example the
host side is running at 1 Gbps and the network side at 10 Mbps.
Three configuration pins, host_config[2:0] are provided to select one of eight operating
configurations for the Host GMAC interfaces. The net_config[1:0] pins select one of four
details on the GMAC Interface configurations.
6.2.1
GMAC GMII/TBI Interface Usage (Host-side Only)
This section discusses the use of the Host Side GMAC interfaces h0 and h1 when configured
to support operation in GMII or TBI modes.
Table 6-1. HOST Interface Modes
host_config[2:0]
Host Interfaces
MAC/PHY
000
RGMII
MAC or PHY
001
RTBI
MAC or PHY
010
SGMII
MAC or PHY
011
SerDes
MAC or PHY
100
GMII
MAC
101
GMII
PHY
110
TBI
MAC
111
TBI
PHY
Table 6-2. Network Interface Modes
net_config[1:0]
Network Interfaces
MAC/PHY
00
RGMII
MAC or PHY
01
RTBI
MAC or PHY
10
SGMII
MAC or PHY
11
SerDes
MAC or PHY
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