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參數(shù)資料
| 型號： | AX88140AQ |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Fast Ethernet MAC Controller |
| 中文描述： | 快速以太網(wǎng)MAC控制器 |
| 文件頁數(shù)： | 34/46頁 |
| 文件大小： | 467K |
| 代理商： | AX88140AQ |
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AX88140A
1
UF - Under-flow Error
When set, indicates that the transmitter aborted the message because data arrived late from memory. Under-
flow error indicates that the AX88140A encountered an empty transmit FIFO while transmitting a frame. The
transmission process enters the suspended state and sets both transmit under-flow (REG5<0>) and transmit
interrupt (REG5<0>).
0
DE - Deferred
When set, indicates that the AX88140A had to defer while ready to transmit a frame because the carrier was
asserted.
PRELIMINARY
ASIX ELECTRONICS CORPORATION
34
Tab - 36 Transmit Descriptor 0
5.3.2 Transmit Descriptor 1 (TDES1)
Field
31
IC - Interrupt on Completion
When set, the AX88140A sets transmit interrupt (REG5<0>) after the present frames has been transmitted. It is
valid only when first segment (TDES1<30>) is set.
30
LS - Last Segment
Description
1
Indicates that the buffer contains the last segment of a
frame.
0
Indicates that the buffer contains the first or middle
segment of a frame.
1
Indicates that the buffer contains the first segment of a
frame.
29
FS - First Segment
0
Indicates that the buffer contains the middle or last segment
of a frame.
28:27
26
Reserved.--Written as “0” for future compatibility concern.
AC - Add CRC Disable
When set, the AX88140A does not append the CRC to the end of the transmitted frame. This field is valid only
when first segment (TDES1<29>) is set.
Reserved.--Written as “0” for future compatibility concern.
1
the AX88140A does not automatically add a padding field,
so a packet shorter than 64 bytes.
The CRC field is added despite the state of
the add CRC disable (TDES1<26>) flag.
25:24
23
DPD - Disabled Padding
0
The AX88140A automaticallyadds a paddingfield andalso
a CRC field to a packet shorter than 64 bytes.
22:11
10:0
Reserved.--Written as “0” for future compatibility concern.
Data Buffer Size
Indicates the size, in bytes, of the data buffer. If this field is 0, the AX88140A ignores this buffer.
Tab - 37 Transmit Descriptor 1
5.3.3 Transmit Descriptor 2 (TDES2)
Field
31:0
Data Buffer Pointer
Physical address of data buffer. There are no limitations on the buffer address alignment.
Description
Tab - 38 Transmit Descriptor 2
5.3.4 Transmit Descriptor 3 (TDES3)
Field
31:0
Address Pointer
Physical address of next descriptor address. There are no limitation on the buffer address alignment.
Description
Tab - 39 Transmit Descriptor 3
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