参数资料
型号: CORE10/100-RM
厂商: Microsemi SoC
文件页数: 44/106页
文件大小: 0K
描述: IP CORE10/100 ETHERNET MAC
标准包装: 1
系列: *
Software Interface
Table 4-28 · STATUS (RDES0) Bit Functions
Core10100 v4.0
44
Bit
RDES0.31
RDES0.30
RDES0.(29..16)
RDES0.15
RDES0.14
RDES0.11
RDES0.10
RDES0.9
RDES0.8
Symbol
OWN
FF
FL
ES
DE
RF
MF
FS
LS
Function
Ownership bit
1 – Core10100 owns the descriptor.
0 – The host owns the descriptor.
Core10100 will clear this bit when it completes a current frame reception or when the
data buffers associated with a given descriptor are already full.
Filtering fail
When set, indicates that a received frame did not pass the address recognition process.
This bit is valid only for the last descriptor of the frame (RDES0.8 set), when the
CSR6.30 (receive all) bit is set and the frame is at least 64 bytes long.
Frame length
Indicates the length, in bytes, of the data transferred into a host memory for a given
frame
This bit is valid only when RDES0.8 (last descriptor) is set and RDES0.14 (descriptor
error) is cleared.
Error summary
This bit is a logical OR of the following bits:
RDES0.1 – CRC error
RDES0.6 – Collision seen
RDES0.7 – Frame too long
RDES0.11 – Runt frame
RDES0.14 – Descriptor error
This bit is valid only when RDES0.8 (last descriptor) is set.
Descriptor error
Set by Core10100 when no receive buffer was available when trying to store the
received data.
This bit is valid only when RDES0.8 (last descriptor) is set.
Runt frame
When set, indicates that the frame is damaged by a collision or by a premature
termination before the end of a collision window.
This bit is valid only when RDES0.8 (last descriptor) is set.
Multicast frame
When set, indicates that the frame has a multicast address.
This bit is valid only when RDES0.8 (last descriptor) is set.
First descriptor
When set, indicates that this is the first descriptor of a frame.
Last descriptor
When set, indicates that this is the last descriptor of a frame.
v4.0
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