參數(shù)資料
型號: 73M2921
廠商: Electronic Theatre Controls, Inc.
英文描述: Advanced Single Chip Modem
中文描述: 先進的單芯片調(diào)制解調(diào)器
文件頁數(shù): 12/41頁
文件大小: 222K
代理商: 73M2921
73M2921
Advanced Single
Chip Modem
Page 12 of 41
TDK Semiconductor
February 99 Rev M
FIGURE 3: Write Command and Response
An example of a Configuration Register write cycle is shown in figures 2 and 3. Figure 2 shows the activity on the
interface register data pins and
8,17
. First there are two command bytes sent by the host processor. The
73M2921 responds (the contents of this response are not important to the host). Then the host writes the high
and low byte of the Configuration register to the 73M2921.
An example of the Control and Data bytes for a CRA write is shown in Figure 3. In this example we will write 90
00h to Configuration register one (CR1). This turns on the digital portion of the 73M2921.
The Control byte shows D6 set to indicate that a word size transfer will take place. D5 is zero to indicate a write
will occur. D4 is set to specify Configuration Register Access. D0 of the Control byte is always 1h for
Configuration Register Access. The data byte shows D7 and D5 set to indicate that CR1 is to be accessed. D4 is
always set for configuration register access. D3:0 are always zero for configuration register access.
The response from the 73M2921 will not be defined.
The word size transfer of CR1 data is also shown in figure 3. The MS byte is 90h. This enables the digital portion
of the 73M2921. The LS byte is 0h. Refer to the configuration register description on pages 10 and 11 for further
information.
0
1
0
1
0
0
0
1
1
0
1
1
0
0
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
MSB
Control Byte
Data Byte
COMMAND FROM HOST
DATA
RESPONSE FROM 73M2921
DATA
LSB
LSB
MSB
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
CR DATA FROM HOST
DATA
LSB
MSB
LOW BYTE
OF CR1
HIGH BYTE
OF CR1
CHOOSE
CR1
WRITE TO
CONFIGURATION
REGISTERS
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