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參數(shù)資料
| 型號(hào)： | 82596DX |
| 廠商： | Intel Corp. |
| 英文描述： | HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR |
| 中文描述： | 高性能的32位局域網(wǎng)協(xié)處理器 |
| 文件頁數(shù)： | 20/77頁 |
| 文件大小： | 787K |
| 代理商： | 82596DX |
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82596DX/SX
TRANSMITTING FRAMES
The 82596 executes high-level Action Commands
from the Command List in system memory. Action
Commands are fetched and executed in parallel with
the host CPU operation, thereby significantly improv-
ing system performance. The format of the Action
Commands is shown in Figure 10. Figure 28 shows
the 82586 mode, and Figures 29 and 30 shows the
command formats of the Linear and 32-bit Segment-
ed modes.
A single Transmit command contains, as part of the
command-specific parameters, the destination ad-
dress and length field of the transmitted frame and a
pointer to buffer area in memory containing the data
portion of the frame. The data field is contained in a
memory data structure consisting of a buffer de-
scriptor (BD) and a data bufferDor a linked list of
buffer descriptors and buffersDas shown in Figure
11.
Multiple data buffers can be chained together using
the BDs. Thus, a frame with a long data field can be
transmitted using several (shorter) data buffers
chained together. This chaining technique allows the
system designer to develop efficient buffer manage-
ment.
The 82596 automatically generates the preamble
(alternating 1s and 0s) and start frame delimiter,
fetches the destination address and length field from
the Transmit command, inserts its unique address
as the source address, fetches the data field speci-
fied by the Transmit command, and computes and
appends the CRC to the end of the frame (see Fig-
ure 12). In the Linear and 32-bit Segmented mode
the CRC can be optionally inserted on a frame-by-
frame basis by setting the NC bit in the Transmit
Command Block (see Figures 29 and 30).
The 82596 generates the standard End Of Carrier
(EOC) start and end frame delimiters. In EOC, the
start frame delimiter is 10101011 and the end frame
delimiter is indicated by the lack of a signal after the
last bit of the frame check sequence field has been
transmitted. In EOC, the 82596 can be configured to
extend short frames by adding pad bytes (7Eh) dur-
ing transmission, according to the length field.
When a collision occurs, the 82596 manages the
jam, random wait, and retry processes, reinitializing
DMA pointers without CPU intervention. Multiple
frames can be sent by linking the appropriate num-
ber of Transmit commands together. This is particu-
larly useful when transmitting a message larger than
the maximum frame size (1518 bytes for Ethernet).
290219–10
Figure 10. Action Command Format
290219–11
Figure 11. Data Buffer Descriptor and
Data Buffer Structure
20
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 82596SX | HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR |
| 82596CA | HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR |
| 8261SHAKE22 | Alternate Action and Momentary Pushbutton Switches |
| 8261SHAKE223 | Alternate Action and Momentary Pushbutton Switches |
| 8261SHAPE22 | Alternate Action and Momentary Pushbutton Switches |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 82596SX | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:HIGH-PERFORMANCE 32-BIT LOCAL AREA NETWORK COPROCESSOR |
| 82598 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:10 GbE Controller |
| 825981-000 | 功能描述:環(huán)形MIL規(guī)格應(yīng)變消除裝置與適配器 TXR18AB00C2008AI RoHS:否 制造商:Amphenol Industrial 產(chǎn)品:Cable Clamps 類型:Bushing Cable Clamps MIL 類型:MIL-DTL-5015 系列:97 外殼大小:16S, 16 匹配樣式:Threaded 主體材料:Aluminum Alloy 主體類型:Straight |
| 82-5988-1000 | 功能描述:RF 連接器 N RIGHT ANGLE CRIMP PLUG RoHS:否 制造商:Bomar Interconnect 產(chǎn)品:Connectors 射頻系列:BNC 型式:Jack (Female) 極性: 觸點(diǎn)電鍍:Gold 阻抗: 端接類型:Solder 主體類型:Straight Bulkhead 電纜類型: |
| 82599_10 | 制造商:INTEL 制造商全稱:Intel Corporation 功能描述:Transforming the data center through a reliable and unified 10GbE network |
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