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參數(shù)資料
| 型號(hào)： | AX88141 |
| 廠商： | ASIX Electronics Corporation |
| 英文描述： | 100BASE-TX/FX PCI BUS FAST ETHERNET MAC CONTROLLER WITH POWER MANAGEMENT |
| 中文描述： | 100BASE-TX/FX PCI總線的快速以太網(wǎng)MAC控制器電源管理 |
| 文件頁(yè)數(shù)： | 28/43頁(yè) |
| 文件大?。?/td> | 308K |
| 代理商： | AX88141 |
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AX88141 PRELIMINARY
ASIX ELECTRONICS CORPORATION
28
CONFIDENTIAL
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 AX88141 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 - 3 Descriptor Structure Example
Buffer 1
Descriptor 0
Buffer 2
Descriptor 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AX88170L | USB to Fast Ethernet/HomePNA Controller |
| AX88172A | USB 2.0 to 10/100M Fast Ethernet Controller |
| AX88172ATF | USB 2.0 to 10/100M Fast Ethernet Controller |
| AX88772A | USB 2.0 to 10/100M Fast Ethernet Controller |
| AX88772ALF | USB 2.0 to 10/100M Fast Ethernet Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AX88172A | 制造商:ASIX 制造商全稱:ASIX 功能描述:USB 2.0 to 10/100M Fast Ethernet Controller |
| AX88172ATF | 制造商:ASIX 制造商全稱:ASIX 功能描述:USB 2.0 to 10/100M Fast Ethernet Controller |
| AX88172L | 制造商:ASIX 制造商全稱:ASIX 功能描述:USB to Fast Ethernet/HomePNA Controller |
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