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): 16/41頁
文件大?。?/td> 222K
代理商: 73M2921
73M2921
Advanced Single
Chip Modem
Page 16 of 41
TDK Semiconductor
February 99 Rev M
FIGURE 4 – Interface Bus Data Activity
FIGURE 5 – Write Command and Response
An example of a write cycle is shown in Figure 4 and 5. Figure 4 shows the activity on the interface data pins and
8,17
. First there are two command bytes sent by the host controller, then an interrupt is generated in
8,17
telling the host to read the response data, then the controller reads back the response from the 73M2921. The
8,17
interrupt is reset when the LS byte is read.
An example of the Control and Data register data in a write command process is shown in Figure 5. In this
example we will write data to the Handshake Register telling it to perform a V.22bis handshake. The Control byte
shows bit 5 low indicating a write process and the lower 5 address bits are set to address 00001b, the Handshake
register. The Data byte contains the new contents for the Handshake register, in this case 04h, indicating a V.22
handshake will be performed. The 73M2921 processes this command and generates an interrupt on
8,17
. The
host then reads the data from the Control register, which echoes the command sent and the Data register which
contain all zeros, or a successful operation.
8,17
is cleared when the Data byte is read.
0
0
0
0
0
0
0
1
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
MSB
COMMAND FROM HOST CONTROLLER
DATA
RESPONSE FROM 73M2921
DATA
LSB
LSB
MSB
OK
ECHO
OF COMMAND
V.22 bis
H/S
WRITE TO
H/S REG.
MS Byte
LS Byte
MS Byte
LS Byte
UD[0-7]
UA XX
10
11
11
XX
10
COMMAND FROM HOST
RESPONSE FROM 73M2921
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