參數(shù)資料
型號： 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)： 12/72頁
文件大?。?/td> 292K
代理商： UPD6708
12
μ
PD6708
(4)
Control field
The control field indicates the type of data and the transfer direction of the subsequent data field.
The control field consists of 4 control bits, a parity bit, and an acknowledge bit.
The control bits are output from the MSB.
A parity bit is output after the control bits. When the parity is even and the slave can execute the function requested
by the master unit, the slave unit outputs an acknowledge signal, and then outputs the next message length field. If the
slave unit cannot execute the function requested by the master unit even if the parity is even, or if the parity is odd, the slave
unit does not output the acknowledge signal but returns to the standby (monitor) state.
After the master unit has confirmed the acknowledge signal, it starts outputting the next message length field.
If the master unit is cannot confirm the acknowledge signal, it enters the standby state and stops communication. In
the case of broadcast communication, however, the master unit starts outputting the message length field without confirming
the acknowledge signal.
For the functions of the control bits, see Table 2-3.
(5)
Message length field
The message length field is used to specify the number of communication data bytes.
The message length field comprises 8 message length bits, a parity bit and, an acknowledge bit.
The message length bits are output from the MSB. The message length bits indicate the number of communication data
bytes as shown in Table 2-2.
Table 2-2. Meaning of Message Length Bits
Message Length Bits (hex)
Number of Transmission Data Bytes
01H
1 byte
02H
2 bytes
:
:
:
:
FFH
255 bytes
00H
256 bytes
Remark
In the communication mode, if the number of bytes exceeding the maximum number of transfer bytes per frame
is set, two or more frames are communicated. In this case, the message length bits indicate the number of
remaining communication data bytes during the second communication and onward.
The operation of this field differs depending on whether the master transmits (bit 3 of control bits is 1) or receives (bit
3 of control bits is 0) data.
<1> When master transmits data
The message length bits and parity bit are output by the master unit. The slave unit outputs the acknowledge signal
and then the next data field if it detects that the parity is even. The slave unit does not output the acknowledge signal
in the case of broadcast communication.
If the parity is odd, the slave unit assumes that the message length bits have not been received correctly, and returns
to the standby (monitor) state without outputting the acknowledge signal. In this case, the master unit also returns to
the standby state, and communication ceases.
#
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UPD6708CX 制造商:NEC 制造商全稱:NEC 功能描述:IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI
UPD6708GS 制造商:NEC 制造商全稱:NEC 功能描述:IEBusa Inter Equipment Busa PROTOCOL CONTROL LSI
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
UPD67101 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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