參數(shù)資料
型號(hào)： 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(yè)數(shù)： 31/46頁(yè)
文件大?。?/td> 467K
代理商： AX88140A
AX88140A
PRELIMINARY
ASIX ELECTRONICS CORPORATION
31
5.2 Receive Descriptors
The receive descriptor provides one buffer, one byte-count buffer, and one address pointer in
each descriptor. Descriptors and receive buffers addresses must be long-word aligned.
Receive Descriptor Format
31
O
W
N
0
RDES0
Status
RDES1
Control bi ts
Byte Count Buffer 2
Byte Count Buffer 1
RDES2
Buffer Address 1
RDES3
Buffer Address 2
Fig - 5 Receive Descriptor Format
5.2.1 Receive Descriptor 0 (RDES0)
RDES0 contains the received frame status, the frame length, and the descriptor ownership
information.
Field
31
Description
1
Indicates that the descriptor is owned by the
AX88140A
Indicates that the descriptor is owned by the host
OWN - Own Bit
The AX88140A clears this bit either when it completes
the frame reception or
when the buffers that are associated with this descriptor
are full.
FF - Filtering Fail
This bit can be set only when receive all (REG6<30>) is
set.
0
1
Indicates that the frame failed the address
recognition filtering
Indicates that the frame passed the address
recognition filtering
30
0
29:16
FL - Frame Length
Indicates the length in bytes of the received frame including the cyclic redundancy check (CRC).
This field is valid only when last descriptor (RDES0<8>) is set and descriptor error ( RDES0<14>) is reset.
ES - Error Summary
Indicates the logical OR of the following RDES0 bits :
This field is valid only when last descriptor (RDES0<8>) is set.
RDES0<1>
CRC error
RDES0<6>
collision seen
RDES0<7>
frame too long
RDES0<11>
runt frame
RDES0<14>
descriptor error
15
14
DE - Descriptor Error. The frame is truncated. Active high.
This field is valid only when last descriptor (RDES0<8>) is set.
13:12
Reserved.--Written as “0” for future compatibility concern.
11
RF - Runt Frame. Indicates that this frame is a runt frame. Active high.
This field is valid only when last descriptor (RDES0<8>) is set .
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AX88140AP 制造商:ASIX 制造商全稱(chēng):ASIX 功能描述:Fast Ethernet MAC Controller
AX88140AQ 制造商:ASIX 制造商全稱(chēng):ASIX 功能描述:Fast Ethernet MAC Controller
AX88141 制造商:ASIX 制造商全稱(chēng):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(chēng):ASIX 功能描述:USB to Fast Ethernet/HomePNA Controller
AX88172 制造商:ASI 制造商全稱(chēng):ASI 功能描述:USB2.0 TO ETHERNET Device setup guide
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