参数资料
型号: CORE10/100-AR
厂商: Microsemi SoC
文件页数: 47/106页
文件大小: 0K
描述: IP CORE10/100 UNLIMITED RTL
标准包装: 1
系列: *
Core10100 v4.0
Table 4-33 · STATUS (TDES0) Bit Functions
Frame Data and Descriptors
Bit
TDES0.31
TDES0.15
TDES0.11
TDES0.10
TDES0.9
TDES0.8
TDES0.(6..3)
Symbol
OWN
ES
LO
NC
LC
EC
CC
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 transmission or when the
data buffers associated with a given descriptor are empty.
Error summary
This bit is a logical OR of the following bits:
TDES0.1 – Underflow error
TDES0.8 – Excessive collision error
TDES0.9 – Late collision
TDES0.10 – No carrier
TDES0.11 – Loss of carrier
This bit is valid only when TDES1.30 (last descriptor) is set.
Loss of carrier
When set, indicates a loss of the carrier during a transmission.
This bit is valid only when TDES1.30 (last descriptor) is set.
No carrier
When set, indicates that the carrier was not asserted by an external transceiver during the
transmission.
This bit is valid only when TDES1.30 (last descriptor) is set.
Late collision
When set, indicates that a collision was detected after transmitting 64 bytes.
This bit is not valid when TDES0.1 (underflow error) is set.
This bit is valid only when TDES1.30 (last descriptor) is set.
Excessive collisions
When set, indicates that the transmission was aborted after 16 retries.
This bit is valid only when TDES1.30 (last descriptor) is set.
Collision count
This field indicates the number of collisions that occurred before the end of a frame
transmission.
This value is not valid when TDES0.8 (excessive collisions bit) is set.
This bit is valid only when TDES1.30 (last descriptor) is set.
v4.0
47
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