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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)： | 30/46頁 |
| 文件大小： | 467K |
| 代理商： | AX88140A |
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AX88140A
PRELIMINARY
ASIX ELECTRONICS CORPORATION
30
5.0 Host Communication
Descriptor lists and data buffers, collectively called the host communication, reside in the host
memory and manage the actions and status related to buffer management.
5.1 Descriptor Lists and Data Buffers
The AX88140A transfers data frames to the receive buffers and from the transmit buffers in host
memory. Descriptors that reside in the host memory act as pointers to these buffers.
There are two descriptor lists, one for receive and one for transmit. The base address of each list is
written into REG3 and REG4, respectively. A descriptor list is forward-linked (explicitly). The
last descriptor may point back to the first entry to create a ring structure. Explicit chaining of
descriptors is accomplished by setting the address pointer chained in both the receive and transmit
descriptors (RDES3 and TDES3). The descriptor lists reside in the host physical memory address
space.
A data buffer consists of either an entire frame or part of a frame, but it cannot exceed a single
frame. Buffers contain only data; buffer status is maintained in the descriptor. Data chaining refers
to frames that span multiple data buffers.
Descriptor Structure Example
Next Descriptor
Fig - 4 Descriptor Structure Example
Buffer 1
Descriptor 0
Buffer 2
Descriptor 1
相關PDF資料 |
PDF描述 |
|---|---|
| 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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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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