參數(shù)資料
型號(hào)： VT86C926
廠商： Electronic Theatre Controls, Inc.
英文描述： AMAZON PCI ETHERNET CONTROLLER
中文描述： 亞馬遜的PCI以太網(wǎng)控制器
文件頁(yè)數(shù)： 19/24頁(yè)
文件大?。?/td> 87K
代理商： VT86C926
VIA T
ECHNOLOGIES
, I
NC
.
P
RELIMINARY
VT86C926
19
The BNRY is updated each time a packet is removed. In that way, the BNRY always follow the CURR
around the ring (see figure 10). However, in situations in which the packet processing is slower than the
packet reception, the ring may be full. When the ring becomes full, all incoming packets are aborted so that
packets already in the ring would not be overwritten (see figure 11). New packets will start to arrive after
the BNRY is updated. The missed packet tally counter would keep track of all missed packets. This
situation is unlikely if enough memory is allocated for the receive buffer ring. If the BNRY is located
outside the buffering, the overwrite protection function will not be available. All incoming packets would
overwrite packets already on the ring, whether the packets on the ring have been processed or not.
Direction
of Rotation
Boundary Pointer
Current Page Register
n
(after the removal of packet)
1
2
3
Boundary Pointer
4
n-1
n-2
1st Packet
Remote DMA
Removes Packet
2nd Packet
New Packets
Arriving
Figure 10. Removing Packets from the Receive Buffer Ring
Direction
of Rotation
Boundary Pointer
1
2
3
4
n-1
n-2
1st Packet
Remote DMA
Removes Packet
2nd Packet
New Packets
Arriving
5
n
Reception Aborted
by NIC overflow
Figure 11. Receive Buffer Ring Overwrite Protection
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