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參數(shù)資料
| 型號(hào)： | TC6216M |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 16 Port 10/100 Unmanaged QoS Ethernet Switch |
| 中文描述： | 非網(wǎng)管16端口10/100以太網(wǎng)交換機(jī)的QoS |
| 文件頁數(shù)： | 15/28頁 |
| 文件大小： | 568K |
| 代理商： | TC6216M |
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TC6216M
- 15 -
Ver. 2.1
5/24/01
make sure that all ports are connected within the trunk, the port order is not mandatory. If one wire from a
defined trunk is not connected, the trunk may not work properly.
Flow Control
10
TC6216M executes backpressure for half duplex and is IEEE 802.3x compliant for full duplex flow control
operation. The chip uses XON/XOFF flow control method in full duplex mode.
For full duplex operation, if no EEPROM is used and FCOpt pin is asserted the autonegotiation flow control
capability resolution is executed. This means that if bit 10 from the Link Partner Advertisement Register is not
set then the transmission of flow control packets is disabled. If FCOpt is
′
0
′
then the entire flow control operation
for full duplex is always executed. The flow control on the receive side is always operational disregarding the
state of FCOpt pin. FCOpt pin represents a global setting for all 16 ports.
When the EEPROM is used, the FCOpt can be override by its equivalent bit FlowControlReg[0]. Supplementary
a setting is offered per port basis DsFulDpxFC (ConfigRegPx[4]). Setting this bit to
′
1
′
will disable the flow
control on that port no matter of autonegotiation result.
Without EEPROM
FCOpt
Pin
A-NEG
(bit 10 from the PHY's Link
Partner Register)
Don
′
t care
Disabled
Enabled
FC – Ability
0
1
Enabled
Disabled
Enabled
With EEPROM
FCOpt
Bit
(FlowControlReg)
0
DsFulDpxFc
Bit
(ConfigRegP
x
)
1
0
1
0
A-NEG
(bit 10 from the PHY's Link
Partner Register)
Don
′
t care
FC – Ability/Port
Disabled
Enabled
Disabled
Disabled
Enabled
Don
′
t care
Disabled
Enabled
1
The backpressure operation can also be disabled using DisBPr pin or per port base using EEPROM
(ConfigRegPx[1]). In case a HUB with many workstations is connected to a port, the HUB may be partitioned in
heavy traffic when the switch executes too musch continuous backpressure. TC6216M can prevent this when
FullBP pin is not asserted by discontinuing the backpressure process after a determined number of consecutive
collisions is reached. This number can be specified using FlowControlReg, field BackPrLv.
11
Broadcast
In case of excessive broadcast the traffic can be throttled on source port basis. TC6216M implements an evolved
throttling method based on both port bandwidth and broadcast memory utilization. This feature is enabled using
BcstTr
configuration pin or the EEPROM
BroadcastReg[2]
bit.
The memory used at any time by broadcast packets that are received from the same port can not exceed a preset
amount. This is represented by a number of 256 byte packet buffers that can be set using BroadcastReg
EEPROM register, field MemThrotReg. When no EEPROM is present the default value of 8 buffers is used.
When more than this number of buffers are in use by broadcast packets, any other broadcast incoming from the
respective port will be dropped.
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