參數(shù)資料
型號： UPD72042BGT
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(shè)備BusTM（IEBusTM）協(xié)議控制
文件頁數(shù)： 9/92頁
文件大小： 541K
代理商： UPD72042BGT
μ
PD72042A, 72042B
9
DATA SHEET S13990EJ2V0DS00
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
Approx. 4.1 Kbps
16
Mode 1
Approx. 17 Kbps
Approx. 18 Kbps
32
f
X
= 6 MHz
f
X
= 6.29 MHz
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
: 50 max
: 150 m max (when twisted-pair cable is used <resistance 0.1
/m or less>)
: 8000 pF max <between BUS- and BUS+>, f
X
= 6 MHz
7100 pF max <between BUS- and BUS+>, f
X
= 6.29 MHz
: 120
Terminating resistance
Caution For the
μ
PD72042A and
μ
PD72042B, as a protective resistance, connect a 180-
resistor in series
with the BUS– and BUS+ pins.
相關(guān)PDF資料
PDF描述
UPD72042A LSI DEVICES FOR Inter Equipment BusTM (IEBusTM) PROTOCOL CONTROL
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