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(lán)的ISA即插即用,即插即用以太網(wǎng)控制器
文件頁數(shù): 101/144頁
文件大?。?/td> 1229K
代理商: CDK8920A
alignment. These "holes" may be 1, 2, or 3 bytes,
depending on the length of the frame preceding
the hole.
5.5.7
RxDMAFrame Bit
The RxDMAFrame bit (Register C, BufEvent,
bit 7) is controlled by the CS8920A and is set
whenever the value in the DMA Frame Count
register is non-zero. The host cannot clear
RxDMAFrame by reading the BufEvent register
(Register C). Table 5.9 summarizes the criteria
used to set and clear RxDMAFrame.
5.5.8
Wrap-Around
Receive DMA Example Without
Figure 5.6 shows three frames stored in host
memory by DMA without wrap-around.
RxStatus - Frame 1
RxLength - Frame 1
RxStatus - Frame 2
RxLength - Frame 2
Frame 2
RxStatus - Frame 3
RxLength - Frame 3
Frame 3
DMA Buffer
Base Address
Frame 1
"Holes" due to
double-word
alignment
DMA Start-of-Frame
register (PacketPage
base + 0026H)
points here.
DMA Byte Count
(PacketPage base + 002Ah)
Figure 5.6. Example of Frames Stored in DMA Buffer
CS8920A
DS238PP2
101
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