參數(shù)資料
型號(hào): GT-48212
廠商: Galileo Technology Services, LLC
英文描述: Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級(jí)交換式 10+10/100 BaseX以太網(wǎng)控制器)
中文描述: 先進(jìn)的交換式以太網(wǎng)控制器的10 10/100 BaseX(高級(jí)交換式10 10/100 BaseX以太網(wǎng)控制器)
文件頁數(shù): 54/135頁
文件大?。?/td> 1619K
代理商: GT-48212
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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Revision 1.2
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BufThrEn bit in the Global Control register or the DAddr[10] pin is held LOW during reset, the GT-482xx dynami-
cally allocates the buffers to the 14 Ethernet ports and the CPU. Therefore, there are no limits on each buffers’
allocation. The Rx Buffer Threshold value can be used for performance tuning during development. For more
details about the RX Threshold register see Table 47 on page 99, Table 48 on page 99, and Table 49 on page 100.
If a received packet overflows the Receive Buffer allowance, the packet is discarded and the Dropped Packets
counter incremented.
5.2
Head-of-Line Blocking
The GT-482xx incorporates a simple mechanism to prevent head-of-line (HOL) blocking. This is done by passing
an indication from the transmit queues to the buffer allocation machine. A packet destined to a transmit port will be
discarded if the following conditions are met:
The transmit queue of destination port exceeds a programmable threshold (as defined in the TxThr field
in the Tx Threshold Register)
Number of buffers allocated to this source port is equal to or greater than the HolLimit value (in Rx
Threshold registers).
HOL prevention is enabled only when the GT-482xx is in Fixed Rx Buffer Mode (BufThrEn = ‘1’).
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