參數(shù)資料
型號(hào)： IXF440
英文描述： LAN HUB CONTROLLER
中文描述： 局域網(wǎng)集線器控制器
文件頁(yè)數(shù)： 65/100頁(yè)
文件大?。?/td> 1354K
代理商： IXF440
IXF440 Multiport 10/100 Mbps Ethernet Controller
Datasheet
65
In the MII mode, the transmit enable signal (ten{i}) is asserted together with the first preamble
byte transmission and is deasserted with the last CRC byte transmission.
6.4.4
Collision
A collision occurs on a half-duplex network when concurrent transmissions from two or more
nodes take place. During transmission, the IXF440 monitors the line condition.
In the MII mode, the IXF440 detects a collision when the collision detect signal (col{i}) asserts.
When the IXF440 detects a collision while transmitting, it halts transmission of the data and transmits
a 32-bit jam pattern. If the collision was detected during the preamble or the SFD transmission, the
jam pattern is transmitted after completing the SFD. This results in a minimum 96-bit fragment.
Note:
The jam pattern is a fixed pattern that is not compared to the actual frame CRC. It has a very low
probability (0.5
32
) of having a jam pattern identical to the CRC.
In standard networks, collisions will always occur before transmission of 64 bytes (including
preamble and SFD), in which case the IXF440 begins the backoff wait period.
The IXF440 scheduling of retransmission is determined through a controlled randomization process,
termed the truncated binary exponential backoff. The delay time is represented by an integer multiple
of slot times (1 slot is equal to a 512-bit time period). The number of the delay slot times, before the
n
th retransmission attempt, is chosen as a uniformly distributed random integer in the range:
0
≤
r
<
2
k
k = min(n, N)
The maximum backoff time is programmable by limiting the
“
N
”
number
(TX_TSHD_BOFF<BKL>). In the IEEE 802.3 Standard,
“
N
”
is equal to 10.
When 16 transmission attempts have been made, all terminated by collisions, the IXF440 reports
an excessive collision event. The IXF440 then stops transmission if programmed to do so
(TX_ERR_MOD<XLCS>). Otherwise, it will continue to transmit the same packet again and
again, while restarting the backoff algorithm as if it were a new packet (n = 0).
In network topology violating standard requirements, collision may occur after transmission of
64 bytes. If the IXF440 was programmed to stop upon late collision (TX_ERR_MOD<LCLS>), it
will flush the transmit FIFO and stop transmitting. Otherwise, the IXF440 will discard the packet
from its FIFO, and resume transmission with the next packet.
6.4.5
Terminating Transmission
A specific frame transmission is terminated under any of the following conditions:
Normal
The frame has been transmitted successfully. After the last byte is serialized, the pad and CRC
are optionally appended and transmitted, thus concluding frame transmission.
CRC error
The txerr signal was asserted during packet loading. The IXF440 infects the CRC it is building and
sends a bad CRC onto the network. An MII error is generated as well (terr assertion in MII mode).
Underflow
Transmit data is not ready when needed for transmission. The packet is terminated on the
network with a bad CRC and an MII error generation (terr assertion in MII mode).
Excessive collisions
相關(guān)PDF資料
PDF描述
IXF6048 Telecommunication IC
IXFH42N20S TRANSISTOR | MOSFET | N-CHANNEL | 200V V(BR)DSS | 42A I(D) | TO-247VAR
IXFH4N100Q TRANSISTOR | MOSFET | N-CHANNEL | 1KV V(BR)DSS | 4A I(D) | TO-247AD
IXFH50N20S TRANSISTOR | MOSFET | N-CHANNEL | 200V V(BR)DSS | 50A I(D) | TO-264AA
IXFH58N20S TRANSISTOR | MOSFET | N-CHANNEL | 200V V(BR)DSS | 58A I(D) | TO-247VAR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IXF-45A15AF 制造商:ILSI 制造商全稱:ILSI America LLC 功能描述:Crystal Filter 3 Lead Metal Package
IXF-45A15AT 制造商:ILSI 制造商全稱:ILSI America LLC 功能描述:Crystal Filter 3 Lead Metal Package
IXF-45A15BF 制造商:ILSI 制造商全稱:ILSI America LLC 功能描述:Crystal Filter 3 Lead Metal Package
IXF-45A15BT 制造商:ILSI 制造商全稱:ILSI America LLC 功能描述:Crystal Filter 3 Lead Metal Package
IXF-45A15CF 制造商:ILSI 制造商全稱:ILSI America LLC 功能描述:Crystal Filter 3 Lead Metal Package
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*