參數(shù)資料
型號: CDK8920A
廠商: Cirrus Logic, Inc.
英文描述: CRYSTAL LAN ISA PLUG-AND-PLAY ETHERNET CONTROLLER
中文描述: 水晶藍的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 105/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
Frame 1
Frame 2
Frame 3 starts to be received and passes the DA filter.
This activates Auto-Switch DMA.
Frame 3
Frame 1 is placed in host memory via DMA freeing
space for the incoming Frame 3. The CS8920A updates
the DMA Frame Count, DMA Start of Frame and DMA
Byte Count registers. It then sets the RxDMA DMAFrame
bit and generates an interrupt.
Frame 2 is placed in host memory via DMA and the
CS8920A updates the DMA registers.
The host responds to the RxDMAFrame interrupt, and
reads the Frame Count register, which is cleared when
read. Since there are no receive interrupts pending, the
CS8920A exits DMA (assumes Frame 3 is still coming in).
Receive DMA used
during this time.
At this point, the CS8920A does not have sufficient buffer
space for another complete large frame (1518 bytes).
Frame 1 received and completely stored in on-chip RAM.
Frame 2 received and completely stored in on-chip RAM.
Enter Example Here
Exit Example
Time
Frame 3 is completely buffered in on-chip RAM, and
awaits processing by the host.
Entering this example, the receive buffer is empty and the
DMA Frame Count (PacketPage base + 0028h) is zero.
Figure 5.9. Example of Auto-Switch DMA
CS8920A
DS238PP2
105
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