參數(shù)資料
型號: UPD72042
廠商: NEC Corp.
英文描述: LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
中文描述: LSI器件間設備BusTM(IEBusTM)協(xié)議控制
文件頁數(shù): 9/92頁
文件大小: 373K
代理商: UPD72042
μ
PD72042
9
Data Sheet S14870EJ1V0DS00
2.2 IEBus COMMUNICATION PROTOCOL
The IEBus is outlined below.
Communication method: Half duplex asynchronous communication
Multi-master method
All units connected to the IEBus can transmit data to every other connected unit.
Broadcast function (one-unit-to-multiple-units communication)
Group broadcast
: Broadcast to a specific group of units
General broadcast
: Broadcast to all units
Two modes, each offering different transmission speeds, can be selected.
Maximum number of bytes
transmitted (bytes/frame)
Mode 0
Approx. 3.9 Kbps
16
Mode 1
Approx. 17 Kbps
32
Transmission speed
Access control: Carrier Sense Multiple Access with Collision Detection (CSMA/CD)
Bus mastership priority is as follows:
1 Broadcast takes priority over ordinary communication (one-unit-to-one-unit communication).
2 Units having lower master addresses have a higher priority.
Communication scale
Number of units
Cable length
Load capacity
Terminating resistance
: 50 max
: 150 m max (when twisted-pair cable is used <resistance 0.1
/m or less>)
: 7000 pF max <between BUS+ and BUS–>
: 120
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