參數(shù)資料
型號(hào): 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(yè)數(shù): 23/130頁(yè)
文件大?。?/td> 770K
代理商: E-110
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E-110 MAC Core
1-15
Figure 1.8
Centralized Statistics Updater
Whenever the E-110 MAC receive and transmit functions complete the
processing of a packet, the MAC creates a transmit or a receive statistics
vector that may be latched external to the MAC function for use by the
statistics updating process. Because the vector is latched, the receive
and transmit functions do not hold the statistics vectors indefinitely. It
then becomes the responsibility of the host to free up enough statistics
storage space before the MAC overwrites the vectors with those for the
next processed packet.
When the MAC latches the receive and transmit statistics vectors, the
MAC provides synchronized latching signals for each of the transmit and
receive vectors. The vectors include Packet Length bits that specify the
length of the packet in bytes. In the example block diagram of Figure 1.8,
the Statistics Updater Synchronizer feeds the Arbiter, which schedules
the updating of statistics in the Statistics Storage. The statistics
subsystem usually operates on the host system microprocessor clock,
Transmit Statistics
Vector Latch
Receive Statistics
Vector Latch
Receive
Statistics
Vector
Transmit
Statistics
Vector
Synchronizer
Arbiter
Statistics
Updater
Statistics
Storage
Channel 1
Host System
Processor
Host System
Processor Interface
MAC
User-Specific
Functions
Transmit Statistics
Vector Latch
Receive Statistics
Vector Latch
Receive
Statistics
Vector
Transmit
Statistics
Vector
Channel N
User-Specific
Functions
E-110
MAC
E-110
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