參數(shù)資料
型號(hào): DM8108
廠商: Electronic Theatre Controls, Inc.
英文描述: 8 port 10/100M Fast Ethernet Switching Controller
中文描述: 8端口10/100M快速以太網(wǎng)交換控制器
文件頁數(shù): 17/35頁
文件大小: 371K
代理商: DM8108
DM8108
8 port 10/100M Fast Ethernet Switching Controller
Preliminary 17
Version: DM8108-DS-P02
November 25, 1999
Receive Exceptional Conditions
Normal network operating conditions
During the reception, the MAC will ensure that if
collision occurs during packet reception, the
packet will be automatically deleted from the
receive FIFO. The Receive FIFO also will delete
any frame that is composed of fewer than 64
bytes (Runt Packet).
Abnormal network operating conditions
Abnormal network conditions include:
. FCS errors
Reception and checking of the received FCS is
performed automatically by the MAC. The
equation is:
32 26 23 22 16 12 11 10 8 7 5 4 2 1
X + X + X + X + X + X + X + X + X + X + X + X + X + X +
1
If any FCS error occurred, the MAC will discard
the packet.
. Late Collision
Late Collision is the collision being detected
after 512-bit times while receiving.
. FIFO transfer error
The MAC also monitors FIFO overflow status,
which will force the most recent receiving
packet (not finished) in the FIFO be discarded.
Back-pressure
The DM8108 will generate “jam pattern” to force
collision on the media as far as it finds out that the
internal resources can not meet it demands.
10/100 Mbps Full-Duplex Operation
When operating in the Full-duplex mode, the CRS
signal is associated with the received frames only and
has no effect on the transmitted frames. The COL
signal is ignored by the MAC while in Full-duplex
mode. Transmission starts when TxEN goes active;
regardless the state of RxDV. Reception starts when
the RxDV signal is asserted indicating traffic on the
receiving port. The DM8108 supports IEEE 802.3x
PAUSE function in the full duplex mode operation.
During receiving, the DM8108 will issues PAUSE
command with the largest timer value to stop the
transmitter if the receiving buffer pointer is above the
full threshold value (high water mark). When the
receiving buffer pointer is below the not-full threshold
value (low water mark), it will issue another PAUSE
command with zero timer value to start the transmitter.
The DM8108 is able to monitor the PAUSE command
and stop transmitting accordingly to the timer value
specified in the command packet.
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