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參數(shù)資料
| 型號(hào)： | CD6420 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | FULL DUPLEX SPEAKERPHONE CHIP |
| 中文描述： | 的全雙工免提通話芯片 |
| 文件頁數(shù)： | 44/52頁 |
| 文件大?。?/td> | 815K |
| 代理商： | CD6420 |
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CDB6420
44
DS205DB1
SOFTWARE
Requirements
Windows 3.1 or better
available LPT port
100KB Hard Disk space
Selecting an LPT Address
When starting the program for the first time, an
LPT address must be specified to communicate
with the CDB6420. This address is usually avail-
able from the BIOS information displayed at sys-
tem boot or from the PC’s CMOS setup program.
This address is necessary for the CDB6420 pro-
gram to manipulate the registers on the board.
Select the LPT address by choosing the appropriate
address in the "Control | LPT Address..." menu-
item. A good way to tell if you have selected the
correct address is to change the Reset Option to
Powerdown (see the Reset Options section), and
press the Current Reset Option button. If you have
an ammeter on the power supply to the CDB6420,
you will see a dramatic decrease in current con-
sumption. Alternatively, you can probe the RST
line and you should see it go low when you press
the button.
Reset Options
A dialog box which supports the various CS6420
reset options is shown in Figure 8. This dialog box
is invoked by selecting the menuitem "Control | Re-
set Options...".
The "Exit Timer" edit box allows the system inte-
grator to test the effects of an early exit from reset.
An integer from 0 to 100 may be entered here to
specify how long after RST goes high the control
word to terminate the reset timer early will be sent.
See the CS6420 datasheet for more details.
The CS6420 is capable of either a cold reset or a
warm reset. A cold reset resets all registers and
Figure 6. Parallel Port
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