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參數(shù)資料
| 型號： | VT6516 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 16/12 PORT 10/1000 ASE T/TX |
| 中文描述： | 16/12港口10/1000日月光噸/德克薩斯州 |
| 文件頁數(shù)： | 31/73頁 |
| 文件大?。?/td> | 440K |
| 代理商： | VT6516 |
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VIA Technologies, Inc.
Preliminary VT6516 Datarsheet
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31-
3.1.4.2 MII interface
The VT6516 communicates with the external 10/100M Ethernet transceiver through standard MII
interface, in this mode the VT6516 became 12 ports MII port due to the MII signal multiplexed with RMII
signal. But the ports number of internal remained as 16 ports. The signals of MII interface are described in
Table-3-2:
Table 3-2 MII interface signals
Name
TCLK
TXD[3:0]
TXEN
COL
CRS
RXD[3:0]
RCLK
RXDV
Type
Description
Transmit Clock
Transmit Data for
.
Transmit
Collision Detected
Carrier Sense
Receive Data
Receive Clock
Receive Data
I
O
O
I
I
I
I
I
Figure 3-2 MII timing diagram
(omitted)
3.1.4.3 Flow control
Under full-duplex mode operation, if the buffer utilization of whole switch has exceeded the upper threshold
and the permanent buffer has been used up, a pause frame with a pause time interval will be send to the sending
port to stop it from sending new frame. If register- FMFCT not enable at this switch, the public buffer will used
until no more buffers. Then further incoming frames will be dropped. The unit in pause time field of the flow
control frame is slot time (512 bits).
The max possible waiting time should be the max packet memory size divided by lowest port speed, for example
if 512MB is the max packet buffer size and 10Mb is the lowest speed, the 512M * 8 bits * 100ns = 409.6 seconds
(8M slot time) is the max possible waiting time. The congestion factor is the max possible waiting time at current
link load. The pause timer value is half of the max possible waiting time. If it is greater than the feasible max
pause time, use all 1’s in pause time value.
If the utilization of the public buffer of the switch drops below the lower threshold, a pause-frame with minimum
frame interval of 0 will be sent to the linking ports the enable new frame transmission.
Under half duplex operation, if the buffer utilization of whole switch has exceeded the upper threshold and the
permanent buffer has been used up, the port will perform back-pressure based flow control by sending a jam
pattern on each incoming frame. If backpressure flow control of the port is not enable, the frame will be dropped.
The flow control pause time is calculated by maintained the configuration of port speed of each port and the
buffer size. With input of the free memory block count and congestion factor, it determines flow control on or
off on an output port. If flow control is on, any new queue request from a input port to this output port will
trigger a flow control frame sent to that request port by the output MAC that is notified by the packet flow
control unit.
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