参数资料
型号: CORE10/100-AR
厂商: Microsemi SoC
文件页数: 48/106页
文件大小: 0K
描述: IP CORE10/100 UNLIMITED RTL
标准包装: 1
系列: *
Software Interface
Table 4-33 · STATUS (TDES0) Bit Functions (continued)
Core10100 v4.0
48
Bit
TDES0.1
TDES0.0
Bit
TDES1.31
TDES1.30
TDES1.29
TDES1.28
TDES1.27
TDES1.26
TDES1.25
TDES1.24
TDES1.23
Symbol
UF
DE
Symbol
IC
LS
FS
FT1
SET
AC
TER
TCH
DPD
Function
Underflow error
When set, indicates that the FIFO was empty during the frame transmission.
This bit is valid only when TDES1.30 (last descriptor) is set.
Deferred
When set, indicates that the frame was deferred before transmission. Deferring occurs if
the carrier is detected when the transmission is ready to start.
This bit is valid only when TDES1.30 (last descriptor) is set.
Table 4-34 · CONTROL (TDES1) Bit Functions
Function
Interrupt on completion
Setting this flag instructs Core10100 to set CSR5.0 (transmit interrupt) immediately
after processing a current frame.
This bit is valid when TDES1.30 (last descriptor) is set or for a setup packet.
Last descriptor
When set, indicates the last descriptor of the frame.
First descriptor
When set, indicates the first descriptor of the frame.
Filtering type
This bit, together with TDES0.22 (FT0), controls a current filtering mode.
This bit is valid only for the setup frames.
Setup packet
When set, indicates that this is a setup frame descriptor.
Add CRC disable
When set, Core10100 does not append the CRC value at the end of the frame. The
exception is when the frame is shorter than 64 bytes and automatic byte padding is
enabled. In that case, the CRC field is added, despite the state of the AC flag.
Transmit end of ring
When set, indicates the last descriptor in the descriptor ring.
Second address chained
When set, indicates that the second descriptor's address points to the next descriptor and
not to the data buffer.
This bit is valid only when TDES1.25 (transmit end of ring) is reset.
Disabled padding
When set, automatic byte padding is disabled. Core10100 normally appends the PAD
field after the INFO field when the size of an actual frame is less than 64 bytes. After
padding bytes, the CRC field is also inserted, despite the state of the AC flag. When
DPD is set, no padding bytes are appended.
v4.0
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