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參數(shù)資料
| 型號(hào)： | UPD6708 |
| 廠商： | NEC Corp. |
| 英文描述： | IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
| 中文描述： | IEBusa設(shè)備布薩間協(xié)議控制大規(guī)模集成電路 |
| 文件頁數(shù)： | 8/72頁 |
| 文件大?。?/td> | 292K |
| 代理商： | UPD6708 |
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8
μ
PD6708
2.2.1 Bus mastership determination (arbitration)
When a unit connected to the IEBus controls another unit, it performs an operation to occupy the bus. This operation
is called arbitration.
Arbitration is to select one unit, and if several units begin to transmit data simultaneously, gives permission to occupy
the bus to that one unit.
So that one unit is granted the permission to occupy the bus as a result of the arbitration, the following priority conditions
are determined.
Remark
The units not given permission through arbitration are automatically allowed to get into retransfer mode (number
of retransfer times for the
μ
PD6708: 3).
(1)
Priority according to type of communication
Broadcast communication (between a single and multiple units) takes precedence over ordinary communication
(between single units).
(2)
Priority according to master address
If the communication devices are of the same type, the unit with the lowest master address has the highest priority.
Example
The master address comprises 12 bits, and unit 000H has the highest priority while unit FFFH has the lowest
priority.
2.2.2 Communication modes
The IEBus is provided with three communication modes with different transfer speeds. The transfer speed and maximum
number of transfer bytes in a single communication frame in each communication mode are shown in Table 2-1.
Table 2-1. Transfer Speed and Maximum Number of Transfer Bytes in Each Communication Mode
Communication Mode
Maximum Number of Transfer Bytes (bytes/frame)
Actual Transfer Speed
Note 1
(Kbps)
f
X
= 12 MHz
Note 2
f
X
= 12.58 MHz
Note 2
0
16
Approx. 3.9
Approx. 4.1
1
32
Approx. 17
Approx. 18
2
128
Approx. 26
Approx. 27
Notes 1.
Actual transfer speed when the maximum number of bytes is transferred
Oscillation frequency when the
μ
PD6708 is used
2.
Cautions
1. A communication mode is selected for each unit connected to the IEBus before communication is
performed. If the communication mode of the master unit is not the same as that of the unit with
which the master unit is to communicate (slave unit), communication cannot be performed correctly.
2. If the oscillation frequency of one unit is fx = 12 MHz and that of the other unit is fx = 12.58 MHz,
communication cannot be performed correctly even if the communication mode is the same. Make
sure that the oscillation frequencies of the two units to communicate are the same.
#
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UPD6708CX | 制造商:NEC 制造商全稱:NEC 功能描述:IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI |
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| UPD6708GS(A) | 制造商:Renesas Electronics Corporation 功能描述: |
| UPD67100 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:ASIC |
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