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參數資料
| 型號： | IP175 |
| 英文描述： | 5-port 10/100M Single Chip Switch |
| 中文描述： | 5端口10/100M自適應單片開關 |
| 文件頁數： | 13/29頁 |
| 文件大?。?/td> | 202K |
| 代理商： | IP175 |
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IP175
Back off Algorithm
Preliminary, Specification
subject to change without notice
13
IP175-DS-P05
Jul. 19, 2002
IP175 provides three parameters to modify its back off
algorithm. They are Modbck, Twopart and NoDrop16.
IP175 implements the IEEE802.3 standard binary
exponential back off algorithm (Modbck=0) and modified
back off algorithm (Modbck=1) when it works at half
duplex mode. If Modbck is set, the maximum back off
time is limited to eight-slot time. The minimum defer time
is separated into the two periods. The first period
consists of the first 64-bit time and the 2
nd
period
consists of the rest 32 bit-time. In the case of minimum
defer time IP175 transmits a packet after 96-bit time
immediately in spite of the status of cable on the 2
nd
period if Twopart is set. After 16 consecutive collisions,
the transmitting packet is dropped if NoDrop16 is reset.
Operation Parameter
IP175 supports many optional functions. They can be
configured to fit different requirements by setting
appropriate parameters. These parameters can be fed
into IP175 through EEPROM interface or through pins.
Flow Control
IP175 provides two mode of flow control. Backpressure
is for half duplex mode and IEEE802.3x flow control is
for full duplex.
Backpressure
The backpressure is used for flow control in half duplex
mode if Bk_en is turned on. When the buffer of a port is
full, it will start to send jam signals. The remote station
will defer transmission after detecting the jam signals.
IP175 support two types of backpresure, collision base
(Bp_kind =2’b10) and carrier base (Bp_kind=2’b00).
Collision based backpressure is sent by IP175, only
when the buffer of a port is full and it receives a packet.
IP175 stops sending backpressure packet when the
remote station is idle. The definition of buffer full for
collision base backpressure is there is no empty buffer
for incoming packets.
Carrier based backpressure is sent by IP175, when the
buffer of a port is full. IP175 sends jam packets
continuously to defer the remote station. The length of
jam packet is 1518 byte and the IPG is equal to 96-bit
time. If the port has packets to transmit during this period,
it transmits the queuing packet instead of the jam
packets. After the queuing packets are transmitted,
IP175 resumes to jam the segment by sending jam
packets if the buffer of a port is full. If a collision occurs,
the back off algorithm is skipped and the jam packets are
generated immediately. The definition of buffer full for
carrier base backpressure is there is only one empty
buffer for a port.
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