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: 57/108页
文件大小: 577K
代理商: E-1110
3-14
Signals
corresponds to 14 bytes of preamble plus one byte of
SFD. By default it should be congured to a value of
8 (0b1000).
E110_BACKPRESS
Back Pressure Flow Control
Input
In 10/100 mode, E110_BACKPRESS is used for
back-pressure control. This signal is synchronously
sampled on the positive edge of the CLK125 signal. This
signal can be derived from the conguration port logic of
the host interface. Care should be taken to ensure that
these inputs are stable during normal operation and
during packet transmissions. In Gigabit mode, the
E110_BACKPRESS signal is a don’t care.
3.3 VLAN Signals
The signals listed in this section allow the host to detect and process
VLAN frames. Signal direction is from the perspective of the E-1110 core.
VLAN_EN
VLAN Enable
Input
This signal, when asserted, enables the detection of
VLAN frames.
VLAN_PKT
VLAN Frame Detected
Output
This signal is asserted during a frame receive operation
any time after 16 clock cycles from the start of frame to
indicate the detection of a VLAN frame. VLAN_PKT is
deasserted with the next start of frame, when MRX_SOP
is asserted.
VLAN_RPVID[11:0]
Extracted VLAN Receive Packet ID
Output
VLAN_RPVID[11:0] is the extracted 12-bit VLAN ID from
the received frame. This information is valid whenever the
VLAN_PKT signal is asserted. The format is dened in
the IEEE 802.1 VLAN standard.
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