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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 43/72頁 |
| 文件大?。?/td> | 292K |
| 代理商： | UPD6708GS |
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43
μ
PD6708
7.
COMMUNICATING WITH HOST CONTROLLER
This section explains the flow of data between the
μ
PD6708 and the host controller via the serial interface (SCK, SO,
SI pins) during communications.
7.1
Master Transmission
Master transmission is the communication data exchange which takes place when a unit becomes a master unit by
specifying AH, BH, and FH as control bits and executing the MREQ1 or MREQ2 command, and then transmitting data and
commands to slave units.
7.1.1
Master transmission by MREQ1 command
(1)
The control bits, number of transmit data bytes and transmit data are placed in the write WDB as command parameters
as shown in Figure 7-1, and the MREQ1 command (command code: 2H) is executed.
When a unit wins in arbitration as the master unit (the end of the master address field), the transmission start return
code (0H) is placed in the status register (STR), and an interrupt request is generated for the host controller. At this time,
the host controller places the third and following bytes of transmit data in WDB.
(2)
Figure 7-1. Data Exchange During Master Transmission (Contents of WDB)
(3)
If the number of data or command bytes specified by “number of transmit data bytes” are transmitted correctly, a
“transmission end” return code (2H) will be placed in STR and an interrupt request will be generated.
If an error occurs during transmission and the data communication is halted, a “termination during transmission” return
code (3H) will be placed in STR and an interrupt request will be generated.
(4)
The timing at which the
μ
PD6708 reads transmit data from WDB is shown below.
Table 7-1. Timing for Reading Transmit Data from WDB
(The minimum time after transmission start return code (0H) is set in STR)
Transmit Data
Timing for Reading Transmit Data from WDB (
μ
s)
Mode 0
Mode 1
Mode 2
Transmit data (first byte)
Approx. 4745
Approx. 1205
Approx. 870
Transmit data (second byte)
Approx. 6325
Approx. 1605
Approx. 1160
:
:
:
:
Transmit data (N-th byte)
Approx. 3165+1580
×
N
Approx. 805+400
×
N
Approx. 580+290
×
N
Broadcast
Bits
Control Bits
Number of Transmit
Data Bytes
First Byte
Second Byte
Third Byte
Fourth Byte
WDB
Transmit Data (First Byte)
Transmit Data (Second Byte)
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