參數(shù)資料
型號: E-110
廠商: LSI Corporation
英文描述: 100BASE-T Fast Ethernet Core(100BASE-T快速以太網(wǎng)處理芯片 Fast Ethernet Core)
中文描述: 100兆- T的快速以太網(wǎng)核心(100兆- T的快速以太網(wǎng)處理芯片快速以太網(wǎng)核心)
文件頁數(shù): 86/130頁
文件大小: 770K
代理商: E-110
3-14
Core Descriptions
Figure 3.8
Receive Function Interface
The general flow of receive packet data is a from a PHY into the receive
function block and out through the receive logic to the host system. The
receive function block of the E-110 MAC interprets 100BASE-T MII
receive data nibble streams and supplies correctly formed packet byte
streams to the host.
1
The receive function searches for the SFD at the
beginning of the packet, verifies the FCS, and detects any dribble nibbles
or receive code violations.
After any packet has been sent to the host from the receive function, the
MAC produces a receive statistics vector. A long event or a carrier event
is noted for a subsequent statistics vector. See the definition of the
RSV[25:0] signals in Chapter 2 for an explanation of long and carrier
events.
The receive function detects and removes the preamble and SFD bytes
at the beginning of the received packet. The E-110 MAC receive function
enforces a minimum IPG between the end of the data portion of one
packet, which contains the FCS, and the beginning of the data
(destination address) portion of the following packet. The IPG allows for
the stations and media to recover between transmissions.
1. See Section 1.2.1, “Fast Ethernet Overview,” on page 1-2 for an explanation of 100BASE-T.
Receive
Logic
Receive
Function
External
MII PHY
Receive
Byte Stream
MAC Function
E-110
ASIC
Control
Status
Receive Statistics
Host
Statistics
Logic
MII
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