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參數(shù)資料
| 型號： | AX88140A |
| 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)： | 33/46頁 |
| 文件大?。?/td> | 467K |
| 代理商： | AX88140A |
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AX88140A
PRELIMINARY
ASIX ELECTRONICS CORPORATION
33
5.3 Transmit Descriptors
Providing one buffer, one byte-count buffer, and two address pointers in each descriptor .
Transmit Descriptor Format
31
0
TDES0
O
W
N
Status
TDES1
Control bi ts
Byte Count Buffer 2
Byte Count Buffer 1
TDES2
Buffer Address 1
TDES3
Buffer Address 2
Fig - 6 Transmit Descriptor Format
5.3.1 Transmit Descriptor 0 (TDES0)
TDES0 contains transmitted frame status and descriptor ownership information.
Field
31
OWN - Own Bit
Description
1
Indicates that the descriptor is owned by the AX88140A.
0
Indicates that the descriptor is owned by the host.
30:16
15
Reserved.--Written as “0” for future compatibility concern.
ES - Error Summary
Indicates the logical OR of the following bits :
TDES0<1>
TDES0<8>
TDES0<9>
TDES0<10>
TDES0<11>
TDES0<14>
TO - Transmit Jabber Time-out : Active high.
The transmission process is aborted and placed in the STOPPED state.
When TDES0<14> is set any heartbeat fail indication (TDES0<7>) is not valid.
Reserved.--Written as “0” for future compatibility concern.
LO - Loss of Carrier during transmission. Active high. (The status is no meaning except 10BASE SRL mode)
Not valid in internal loop-back mode (REG6<11:10>=01).
NC - No Carrier. Indicates that the carrier signal from the transceiver was not present during transmission.
Active high.
Not valid in internal loop-back mode (REG6<11:10>=01).
LC -LateCollision.Whenset, indicatesthattheframetransmissionwas abortedduetocollisionoccurringafter
the collision window of 64 bytes. Not valid if under-flow error (TDES0<1>) is set.
EC - Excessive Collision When set, indicates that the transmission was aborted after 16 successive collisions
while attempting to transmit the current frame.
HF - Heartbeat Fail
This bit is effective only in 10Mb/s operation mode. When set, indicates a heartbeat collision check failure
This bit is not valid if under-flow error (TDES0<1>) is set.
On the second transmission attempt, after the first transmission was aborted due to collision, the AX88140A
does not check heartbeat fail and (TDES0<7>) is reset.
CC - Collision Count
This 4-bit counter indicates the number of collisions that occurred before the frame was transmitted.
Not valid when the excessive collisions bit (TDES0<8>) is also set.
Reserved.--Written as “0” for future compatibility concern.
under-flow error
successive collisions
late collision
no carrier
loss of carrier
transmit jabber time-out
14
13:12
11
10
9
8
7
6:3
2
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| AX88140AP | Fast Ethernet MAC Controller |
| AX88140AQ | Fast Ethernet MAC Controller |
| AX88196 | 10/100BASE 3-in-1 Local CPU Bus Fast Ethernet Controller with Embedded SRAM |
| AX88196L | 10/100BASE 3-in-1 Local CPU Bus Fast Ethernet Controller with Embedded SRAM |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AX88140AP | 制造商:ASIX 制造商全稱:ASIX 功能描述:Fast Ethernet MAC Controller |
| AX88140AQ | 制造商:ASIX 制造商全稱:ASIX 功能描述:Fast Ethernet MAC Controller |
| AX88141 | 制造商:ASIX 制造商全稱:ASIX 功能描述:100BASE-TX/FX PCI BUS FAST ETHERNET MAC CONTROLLER WITH POWER MANAGEMENT |
| AX88170L | 制造商:ASIX 制造商全稱:ASIX 功能描述:USB to Fast Ethernet/HomePNA Controller |
| AX88172 | 制造商:ASI 制造商全稱:ASI 功能描述:USB2.0 TO ETHERNET Device setup guide |
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