参数资料
型号: CORE10/100-RM
厂商: Microsemi SoC
文件页数: 42/106页
文件大小: 0K
描述: IP CORE10/100 ETHERNET MAC
标准包装: 1
系列: *
Software Interface
Core10100 v4.0
single frame. In a ring structure, the descriptor operation may be corrupted if only one descriptor is used. Additionally,
in the ring structure, at least two descriptors must be set up by the host. In a transmit process, the host can give the
ownership of the first descriptor to Core10100 and causes the data specified by the first descriptor to be transmitted. At
the same time, the host holds the ownership of the second or last descriptor to itself. This is done to prevent Core10100
from fetching the next frame until the host is ready to transmit the data specified in the second descriptor. In a receive
process, the ownership of all available descriptors, unless it is pending processing by the host, must be given to
Core10100.
Core10100 can store a maximum of two frames in the Transmit Data FIFO, including the frame waiting inside the
Transmit Data FIFO, the frame being transferred from the data interface into the Transmit Data FIFO, and the frame
being transmitted out via the MII interface from the Transmit Data FIFO.
Core10100 can store a maximum of four frames in the Receive Data FIFO, including the frame waiting inside the
Receive Data FIFO, the frame being transferred to the data interface from the Receive Data FIFO, and the frame being
received via the MII interface into the Receive Data FIFO.
CSR
Shared
CSR3/CSR4 – Descriptor List Base
OWN
CSR
DSL – Descriptor Skip
RIN
Buffer 1
Buffer 2
OWN
RIN
Buffer 1
Buffer 2
OWN
RIN
Buffer 1
Buffer 2
Data
Data
Data
Figure 4-3 · Descriptors in Ring Structure
42
v4.0
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