參數(shù)資料
型號: KSZ8851SNL-EVAL
廠商: Micrel Inc
文件頁數(shù): 24/80頁
文件大?。?/td> 0K
描述: BOARD EVALUATION KSZ8851SNL
產(chǎn)品培訓模塊: KSZ8851 10/100 Embedded Controllers
標準包裝: 1
系列: LinkMD®
主要目的: 接口,以太網(wǎng)控制器(PHY 和 MAC)
嵌入式:
已用 IC / 零件: KSZ8851SNL
主要屬性: 1 個端口,100BASE-TX/10BASE-T
次要屬性: SPI 接口,LinkMD 線纜診斷
已供物品: 板,文檔
產(chǎn)品目錄頁面: 1081 (CN2011-ZH PDF)
相關產(chǎn)品: 576-3299-6-ND - IC CTLR MAC/PHY NON-PCI 32-MLF
576-3299-1-ND - IC CTLR MAC/PHY NON-PCI 32-MLF
576-3299-2-ND - IC CTLR MAC/PHY NON-PCI 32-MLF
576-3254-ND - IC CTLR MAC/PHY NON-PCI 32-QFN
其它名稱: 576-3293
Micrel, Inc.
KSZ8851SNL/SNLI
August 2009
30
M9999-083109-2.0
Driver Routine for Receive Packet from KSZ8851SNL to Host Processor
The software driver receives data packet frames from the KSZ8851SNL device either as a result of polling or an interrupt
based service. When an interrupt is received, the OS invokes the interrupt service routine that is in the interrupt vector
table.
If your system has OS support, to minimize interrupt lockout time, the interrupt service routine should handle at interrupt
level only those tasks that require minimum execution time, such as error checking or device status change. The routine
should queue all the time-consuming work to transfer the packet from the KSZ8851SNL RXQ into system memory at task
level. The following Figure 13 shows the step-by-step for receive packets from KSZ8851SNL to host processor.
Note: Each DMA read operation from the host CPU to read RXQ frame buffer, the first read data (byte in 8-bit bus mode,
word in 16-bit bus mode and double word in 32-bit bus mode) is dummy data and must be discarded by host CPU.
Afterward, host CPU must read each frame data to align with double word boundary at end. For example, the host CPU
has to read up to 68 bytes if received frame size is 65 bytes.
Figure 13. Host RX Single or Multiple Frames in Auto-Dequeue Flow Diagram
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