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(yè)數(shù)： 30/77頁(yè)
文件大?。?/td> 787K
代理商： 82596DX
82596DX/SX
RECEIVE UNIT (RU)
The Receive Unit is the logical unit that receives frames and stores them in memory. The RU is modeled as a
logical machine that takes, at any given time, one of the following states.
#
Idle.
The RU has no memory resources and is discarding incoming frames. This is the initial state.
#
No Resources.
The RU has no memory resources and is discarding incoming frames. This state differs
from Idle in that the RU accumulates statistics on the number of discarded frames.
#
Suspended.
The RU has memory available for storing frames, but is discarding them. The suspend state
can only be reached if the CPU forces it through the SCB or sets the suspend bit in the RFD.
#
Ready.
The RU has memory available and is storing incoming frames.
The CPU can affect RU operation in three ways: by issuing a RU Control Command, by setting bits in the
Frame Descriptor Command word of the frame being received, or by setting the EL bit of the current buffer’s
Buffer Descriptor.
When programming the 82596 RU, it is important to consider the asynchronous way the 82596 processes
receive frames. If an RU Start is issued to the 82596 RU, it may be busy processing other incoming packets. In
order to avoid asynchronous race conditions, the following guidelines are recommended to the 82596 pro-
grammer:
#
If the RU is already in the Ready state, and a new RFA is required to be started, it is unwise to immediately
issue another RU Start command. If the new RFA needs to be started, first issue an RU Suspend com-
mand, wait for the RU to become Suspended, then issue the new RU Start. This will insure that all incoming
frames are received correctly.
#
In general, it is a good idea to make sure any RU command has been accepted and executed before
issuing a new control command to the RU.
SYSTEM CONTROL BLOCK (SCB)
The SCB is a memory block that plays a major role in communications between the CPU and the 82596. Such
communications include the following.
#
Commands issued by the CPU
#
Status reported by the 82596
Control commands are sent to the 82596 by writing them into the SCB and then asserting CA. The 82596
examines the command, performs the required action, and then clears the SCB command word. Control
commands perform the following types of tasks.
#
Operation of the Command Unit (CU). The SCB controls the CU by specifying the address of the Command
Block List (CBL) and by starting, suspending, resuming, or aborting execution of CBL commands.
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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
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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(lèi)型:Solder 主體類(lèi)型:Straight Bulkhead 電纜類(lèi)型:
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