参数资料
型号: E-1110
英文描述: E-1110 10/100/1000 Mbits/s Ethernet MAC preliminary technical manual 4/01
中文描述: 电子1110 10/100/1000 Mbits /秒以太网MAC初步的技术手册4 / 01
文件页数: 37/108页
文件大小: 577K
代理商: E-1110
2-24
Functional Description
supported on the media is 64 bytes, including the elds listed in
Table 2.1, with the required padding and the four-byte FCS eld.
In the Gigabit mode, the MAC is designed to operate with an IPG of
64 ns and transmit and receive packets of sizes up to 9,000 bytes.
Attempting to receive longer packets may cause packet data corruption.
However there is no limit on the transmit side packet size. The
10/100 MAC limits the transmit frame size to the maximum programmed
packet length.
2.2 Physical Layer Device (PHY) Interface
The E-1110 core supports three different MAC to PHY interfaces:
1000 Mbits/s GMII
1000 Mbits/s TBI
10/100 Mbits/s MII
Note:
in 10/100 mode, the PHY interface is always MII; in
1000 mode, the PHY interface can be GMII or TBI.
The E-1110 core implements a simple 2:1 or 3:1 multiplexer, which is
controlled with the MAC_SPEED_MODE and MAC_PHY_MODE
conguration signals.
The MAC_PHY_MODE signal selects between the GMII mode and the
TBI mode. If TBI mode is selected, the Gigabit MAC is connected to the
GMII interface of the PCS module instead of the PHY. Depending upon
the conguration, the denition of the signals changes to suit the interface
requirements.
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