參數(shù)資料
型號(hào)： RTL8305S
廠商： Electronic Theatre Controls, Inc.
英文描述： 5-PORT 10/100 MBPS SINGLE CHIP SWITCH CONTROLLER
中文描述： 5端口10/100 Mbps單片開(kāi)關(guān)控制器
文件頁(yè)數(shù)： 11/24頁(yè)
文件大小： 417K
代理商： RTL8305S
RTL8305S
2002/02/19
Rev. 1.2
11
6.2.5 Flow Control
The RTL8305S supports IEEE 802.3x full duplex flow control and half duplex back-pressure congestion control. Once
the full duplex flow control ability is enabled via ENFCTRL, the Nway ability with full duplex flow control will be
negotiated during the auto-negotiation process. When operating in half duplex mode, a proprietary back-pressure
algorithm is enabled via the ENBKPRS pin, which can prevent traditional hub devices from partition due to excessive
collisions. For MII port applications, the same functions will be applied to port4 depending on the state of P4FLCTRL#
and P4DUPSTA#. If port4 is not configured to MII port application, it acts as a UTP port and behaves according to the
configuration of the ENFCTRL and ENBKPRS pins.
6.2.6 Back-off Algorithm
The RTL8305S implements the truncated exponential back-off algorithm compliant to the 802.3 standard. The collision
counter will be reset after 16 consecutive collisions, which leads to a smaller back-off time.
6.2.7 Inter-Frame Gap
The Inter-Frame Gap is 9.6us for 10Mbps Ethernet and 960ns for 100Mbps Fast Ethernet.
6.2.8 Illegal Frame
Illegal frames such as CRC error packets, runt packets ( packet length less than 64 bytes) and oversize packets (packet length
greater than 1536 bytes) will be discarded.
6.2.9 Broadcast Storm Control
The RTL8305S processes broadcast storm control via the latched value of the EnBrdCtrl pin upon reset. Once enabled, the
incoming consecutive broadcast packets will be discarded after consecutive 64 broadcast packets are received during an 800ms
time window. Any non-broadcast packets can reset the time window and broadcast counter such that the scheme restarts.
6.3 Physical Layer Functional Overview
6.3.1 Auto-negotiation
The RTL8305S obtains the states of duplex, speed and flow control ability through the auto-negotiation mechanism, defined in
IEEE802.3u specifications, for each UTP port. During auto-negotiation, each port advertises its ability to its link partner and
compares ability with those received from its link partner. By default, the RTL8305S advertises full capabilities (100Full,
100Half, 10Full, 10Half) together with flow control ability.
Asserting NWAYHALF# sets the Nway ability of the RTL8305S to half duplex only (100Half, 10Half). Deasserting
ENFCTRL sets the Nway ability without the flow control function. ENBKPRS is a pin to enable the half duplex flow control
scheme, which is defined in auto-negotiation. The MII port obtains its duplex, speed, flow control and link states from pins as
described in section 5.5.
6.3.2 10Base-T Transmit Function
The output 10Base-T waveform is Manchester-encoded and driven into the network medium. The internal filter shapes the
driven signals to reduce EMI emission, eliminating the need for an external filter.
6.3.3 10Base-T Receive Function
The Manchester decoder converts the incoming serial stream to NRZ data when the squelch circuit detects that the signal level
has exceeded the configured squelch level.
6.3.4 Link Monitor
The 10Base-T link pulse detection circuit always monitors the RXIP/RXIN pins for the presence of valid link pulses.
Auto-polarity is implemented to correct the detected reverse polarity of RXIP/RXIN signal pairs.
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