參數(shù)資料
型號： RTL8309SB
廠商： Electronic Theatre Controls, Inc.
英文描述： SINGLE-CHIP 9-PORT 10/100MBPS SWITCH CONTROLLER
中文描述： 單芯片9口10/100Mbps開關(guān)控制器
文件頁數(shù)： 84/115頁
文件大小： 866K
代理商： RTL8309SB
RTL8309SB
Datasheet
Single-chip 9-port 10/100Mbps Switch Controller
69
Track ID: JATR-1076-21 Rev. 1.4
8.2.2.
Flow Control
The RTL8309SB supports standard IEEE 802.3x full duplex flow control ability on both transmit and receive sides. If the
RTL8309SB recognizes that the resources of the destination port of this packet are being used up, it will issue a ‘pause on’
frame to the source port of this packet with a maximum time as defined in IEEE 802.3x. Once the resource is available, the
RTL8309SB sends a ‘pause off’ frame with zero pause time to turn on transmissions.
On the receive side, when the RTL8309SB receives a pause control packet on a port, it stops transmitting any packets to this
port, except flow control packets, for a period of time specified in the received pause control frame. If it receives another pause
control packet in this period of time on the same port, the timer will be updated with the new value specified in the latest pause
control packet. The RTL8309SB will re-start transmitting packets on this port after the timer has expired.
8.2.3.
Half Duplex Operation
In half duplex mode, the CSMA/CD media access method is the means by which two or more stations share a common
transmission medium. To transmit, a station waits (defers) for a quiet period on the medium (that is, no other station is
transmitting) and then sends the intended message in bit-serial form. If the message collides with that of another station, then
each transmitting station intentionally transmits for an additional predefined period to ensure propagation of the collision
throughout the system. The station remains silent for a random amount of time (backoff) before attempting to transmit again.
When a transmission attempt has terminated due to a collision, it is retried until it is successful. A controlled randomization
process called “truncated binary exponential backoff” determines the scheduling of the retransmissions. At the end of
enforcing a collision (jamming), the switch delays before attempting to retransmit the frame. The delay is an integer multiple
of slotTime (512 bit times). The number of slot times to delay before the n
th
retransmission attempt is chosen as a uniformly
distributed random integer ‘r’ in the range:
0
r < 2
k
where:
k =min (n, backoffLimit). IEEE 802.3 defines the backoffLimit as 10.
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