PRODUCT CONFIGURATION OPTIONS
The standard features of each chipset are listed in the following table.
Parallel/Serial
Host Interface
PC Card
Host Interface
Program
Memory
Options
Buffer
Memory
(SRAM)
DSP
Memory
Feature Set
Data/fax/voice
CL-MD5650
CL-MD5651T
Data/fax/voice
with speakerphone
Data/fax/voice with
ITU-V.70 DSVD
upgrade option and
speakerphone
CL-MD5652
CL-MD5653T
two 256K
´
8;
70 ns
32K
´
8;
25 ns
two 32K
´
8;
12 ns
CL-MD5662T
CL-MD5663T
COMPLETE DESIGN GUIDELINES
Reference Designs Available
Cirrus Logic provides reference designs for use and
modiÞcation by customers. These designs demonstrate
chipset applications for several common configurations.
The design documentation includes schematics, bills of
materials, fabrication drawings, and MS-DOSÐ or Win-
dows
â
-based OrCAD
â
Þles.
19 modes related to voice features. Seven of these
modes provide basic voice features and three modes
support DSVD operation.
Minimal-Component Design
Besides the SRAM and ßash or ROM components listed
above, only a single crystal and 2 Kbytes of NVRAM
(non-volatile RAM) are required to complete the de-
signs. No additional components are needed to add ISA
bus interface, plug-and-play, speakerphone, or DSVD
features. The I/O interface circuit does require relay sup-
port for Caller ID and telephony features.
Simple Software Upgrades
End users can easily download and install upgrades of
56K software from manufacturer-supported Internet
sites. The use of ßash memory permits these Þeld up-
grades. Additional program memory is required to sup-
port the 32 Kbytes of RAM needed for 56K operation
and a full feature set.
Reduced EMI/RFI Emissions
A single crystal serves as a clock for both the controller
and DSP in the CL-MD56XX chipsets. Besides reducing
cost, the single-crystal design minimizes high-frequen-
cy harmonics and simpliÞes EMI/RFI design consider-
ations.
Complete Telephony Interface Design
A proprietary telephone interface design is included in
each reference design provided to all Cirrus Logic cus-
tomers. The telephony interface supports Caller ID and
CIRRUS [ CIRRUS LOGIC ]
