參數資料
型號: DS33Z11
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 網絡接口
英文描述: Ethernet Mapper
中文描述: DATACOM, NETWORK INTERFACE SUPPORT CIRCUIT, PBGA169
封裝: 14 X 14 MM, 1 MM PITCH, CSBGA-169
文件頁數: 42/169頁
文件大?。?/td> 1049K
代理商: DS33Z11
DS33Z11 Ethernet Mapper
Figure 8-3 Flow Control Using Pause Control Frame
42 of 169
Receive Queue
Growth
Receive Queue High
Water Mark
Initiate Flow control
8
Rx
Data
Receive Queue Low
Water
8.12.2 Half Duplex Flow control
Half duplex flow control uses a jamming sequence to exert backpressure on the transmitting node. The receiving
node jams the first 4 bytes of a packet that are received from the MAC in order to cause collisions at the distant
end. In both 100 Mbps and 10 Mbps MII/RMII modes, 4 bytes are jammed upon reception of a new frame. Note
that the jamming mechanism does not jam the current frame that is being received during the watermark crossing,
but will wait to jam the next frame after the SU.RQHT bit is set. If the queue remains above the high threshold,
received frames will continue to be jammed. This jam sequence is stopped when the queue falls below the high
threshold.
8.12.3 Host-Managed Flow control
Although automatic flow control is recommended, flow control by the host processor is also possible. By utilizing
the high watermark interrupts, the host processor can manually issue pause frames or jam incoming packets to
exert backpressure on the transmitting node. Pause frames can be initiated with SU.MACFCR.FCB bit. Jam
sequences can be initiated be setting SU.GCR.JAME. The host can detect pause frames by monitoring
SU.RFSB3.UF and SU.RFSB3.CF. Jammed frames will be indistinguishable from packet collisions.
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DS33Z11+UNUSED 功能描述:網絡控制器與處理器 IC Ethernet Mapper RoHS:否 制造商:Micrel 產品:Controller Area Network (CAN) 收發(fā)器數量: 數據速率: 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
DS33Z11DK 功能描述:以太網開發(fā)工具 DS33Z11 Dev Kit RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓:
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DS33Z41DK 功能描述:以太網開發(fā)工具 DS33Z41 Dev Kit RoHS:否 制造商:Micrel 產品:Evaluation Boards 類型:Ethernet Transceivers 工具用于評估:KSZ8873RLL 接口類型:RMII 工作電源電壓: