參數(shù)資料
型號： DS33ZH11+
廠商： Maxim Integrated Products
文件頁數(shù)： 108/172頁
文件大小： 0K
描述： IC MAPPER ETHERNET 100CSBGA
產(chǎn)品培訓模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 7
應用： 數(shù)據(jù)傳輸
接口： 串行
電源電壓： 1.8V，2.5V，3.3V
封裝/外殼： 100-LFBGA，CSPBGA
供應商設備封裝： 100-CSBGA（10x10）
包裝： 托盤
安裝類型： 表面貼裝
DS33Z11 Ethernet Mapper
40 of 172
8.12 Flow Control
Flow control may be required to ensure that data queues do not overflow and packets are not lost. The DS33Z11
allows for optional flow control based on the queue high watermark or through host processor intervention. There
are 2 basic mechanisms that are used for flow control:
In half duplex mode, a jam sequence is sent that causes collisions at the far end. The collisions cause the
transmitting node to reduce the rate of transmission.
In full duplex mode, flow control is initiated by the receiving node sending a pause frame. The pause
frame has a timer parameter that determines the pause timeout to be used by the transmitting node.
Note that the terms “transmit queue” and “receive queue” are with respect to the Ethernet Interface. The Receive
Queue is the queue for the data that arrives on the MII/RMII interface, is processed by the MAC and stored in the
SDRAM. Transmit queue is for data that arrives from the Serial port, is processed by the HDLC and stored in the
SDRAM to be sent to the MAC transmitter.
The following flow control options are possible:
Automatic flow control can be enabled in hardware mode by the AFCS pin.
Automatic flow control can be enabled in software mode with the SU.GCR.ATFLOW bit. Note that the
user does not have control over SU.MACFCR.FCE and FCB bits if ATFLOW is set. The mechanism of
sending pause or jam is dependent only on the receive queue high threshold.
Manual flow control can be performed through software when SU.GCR.ATFLOW = 0. The host processor
must monitor the receive queues and generate pause frames (full duplex) and/or jam bytes through the
Note that in order to use flow control, the receive queue size (in AR.RQSC1) must be 02h or greater. The receive
queue high threshold (in SU.RQHT) must be set to 01h or greater, but must be less than the queue size. If the
high threshold is set to the same value as the queue size, automatic flow control will not be effective. The high
threshold must always be set to less than the corresponding queue size.
The following table provides all the options on flow control mechanism for DS33Z11.
Table 8-4 Options for Flow Control
HARDWARE MODE
SOFTWARE MODE
Configuration
Full duplex,
No flow
control
Full duplex,
Flow control
With respect
to SU.RQHT
Half Duplex;
Manual Flow
Control
Half Duplex;
Automatic
Flow Control
Full Duplex;
Manual Flow
Control
Full Duplex;
Automatic
Flow Control
HWMODE Pin
1
0
AFCS Pin
0
1
N/A
ATFLOW Bit
N/A
0
1
0
1
JAME Bit
N/A
Controlled By
User
Controlled
Automatically
N/A
FCB Bit
(Pause)
N/A
Controlled
Automatically
N/A
Controlled by
User
Controlled
Automatically
FCE Bit
N/A
Set to AFCS
pin = High
Controlled By
User
Controlled
Automatically
Controlled By
User
Controlled
Automatically
Pause Timer
N/A
Set to 140h
N/A
Programmed
by User
Programmed
by User
相關PDF資料
PDF描述
DS34C87TN/NOPB IC LINE DRIVER QUAD CMOS 16-DIP
DS34LV87TMX/NOPB IC LINE DVR QUAD CMOS DIF 16SOIC
DS34S132GN+ IC TDM OVER PACKET 676-BGA
DS34T102GN+ IC TDM OVER PACKET 484TEBGA
DS3501U+H IC POT NV 128POS HV 10-USOP
相關代理商/技術參數(shù)
參數(shù)描述
DS33ZH11+ 功能描述:網(wǎng)絡控制器與處理器 IC 10/100 ENETXPORT HMODE MAP IND RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS34 制造商:LUMILEDS 制造商全稱:LUMILEDS 功能描述:power light source Luxeon V Emitter
DS-3400D UK 制造商:TRUST 功能描述:DESKTOP WIRELESS OPTICAL TRUST
DS3404FP000 制造商:Thomas & Betts 功能描述:30A,PLG,3P4W,MG,404,3P480V
DS3404FP000/JG63 制造商:Thomas & Betts 功能描述:30A,CON,3P4W,MG,404,3P480V,JG63,SC
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*