参数资料
型号: CORE10/100-RM
厂商: Microsemi SoC
文件页数: 45/106页
文件大小: 0K
描述: IP CORE10/100 ETHERNET MAC
标准包装: 1
系列: *
Core10100 v4.0
Frame Data and Descriptors
Table 4-28 · STATUS (RDES0) Bit Functions (continued)
Bit
RDES0.7
RDES0.6
RDES0.5
RDES0.3
RDES0.2
RDES0.1
RDES0.0
Symbol
TL
CS
FT
RE
DB
CE
ZERO
Function
Frame too long
When set, indicates that a current frame is longer than maximum size of 1,518 bytes, as
specified by 802.3.
TL (frame too long) in the receive descriptor has been set when the received frame is
longer than 1,518 bytes. This flag is valid in all receive descriptors when multiple
descriptors are used for one frame.
Collision seen
When set, indicates that a late collision was seen (collision after 64 bytes following
SFD).
This bit is valid only when RDES0.8 (last descriptor) is set.
Frame type
When set, indicates that the frame has a length field larger than 1,500 (Ethernet-type
frame). When cleared, indicates an 802.3-type frame.
This bit is valid only when RDES0.8 (last descriptor) is set.
Additionally, FT is invalid for runt frames shorter than 14 bytes.
Report on MII error
When set, indicates that an error has been detected by a physical layer chip connected
through the MII interface.
This bit is valid only when RDES0.8 (last descriptor) is set.
Dribbling bit
When set, indicates that the frame was not byte-aligned.
This bit is valid only when RDES0.8 (last descriptor) is set.
CRC error
When set, indicates that a CRC error has occurred in the received frame.
This bit is valid only when RDES0.8 (last descriptor) is set.
Additionally, CE is not valid when the received frame is a runt frame.
This bit is reset for frames with a legal length.
v4.0
45
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