參數(shù)資料
型號(hào)： UPD6708GS
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(yè)數(shù)： 10/72頁(yè)
文件大小： 292K
代理商： UPD6708GS
10
μ
PD6708
2.3 Transfer Protocol
The IEBus transfer signal format is shown in Figure 2-1.
Data is transferred as a series of signals called a communication frame. The number of data that can be transferred in
one communication frame and the transfer speed differ depending on the communication mode.
Figure 2-1. Transfer Signal Format
P: Parity bit (1 bit)
A: Acknowledge bit (1 bit)
When A = 0: ACK
When A = 1: NAK
N: Number of data bytes
Remark
In broadcast communication, the value of the acknowledge bit is ignored.
(1)
Header
A header comprises a start bit and a broadcast bit, as described below.
<1> Start bit
The start bit is a signal which tells the other units that data transmission will start.
The unit which is about to start transmitting data will output the low signal (the start bit) for a specified time, and then
outputs the broadcast bit.
If another unit is already outputting a start bit before one unit outputs a start bit, the unit will not output the start bit.
It will wait until the another unit completely outputs the start bit, and then outputs the broadcast bit.
The units other than the one that has started transmission detect this start bit and enters the reception state.
<2> Broadcast bit
The broadcast bit distinguishes between broadcast communication and ordinary communication.
When this bit is ‘0’, it indicates broadcast communication; when it is ‘1’, it indicates ordinary communication. There
are two types of broadcast communication: group broadcast and general broadcast. These types are identified by the
value of the slave address (for the slave address, see
(3) “Slave address field”
).
In broadcast communication, there are a number of slave units. Therefore, the acknowledge bit is not returned in the
fields described in (2) below and onward.
If two or more units start to transmit a communication frame simultaneously, broadcast communication takes
precedence over ordinary communication, and wins in the arbitration.
#
Field Name
Number of Bits
Transfer Time
Mode 0
Mode 1
Mode 2
Header
Master
Address Field
12
Slave Address
Field
12
Control Field
Message
Length Field
8
Data Field
1
1
1
1
1
4
1
1
1
1
8
1
1
8
1
1
Start
Bit
Broad-
cast
Bit
Master
Address
P
Slave
Address
P
A Control
Bit
P
A
Message
Length
Bit
P
A
Data
Bit
P
A
Data
Bit
P
A
Approx. 7330 s
Approx. 2090 s
Approx. 1590 s
Approx. 1590
×
N s
Approx. 410
×
N s
Approx. 300
×
N s
(f
x
= at 12 MHz)
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