am79c30a Advanced Micro Devices, am79c30a Datasheet - Page 65

• Manufacturer Part Number: am79c30a
• Description: Digital Subscriber Controller ?dsc ?circuit
• Manufacturer: Advanced Micro Devices

APPLICATIONS
ISDN Feature Phone
This basic feature phone is the ISDN equivalent to the
common analog phone. The keypad can be a simple
four-by-four single-pole switch-matrix or a larger-matrix
to provide full-key system features. The display option
illustrated in Figure 14 can be included in any of theap-
plications shown in this section.
RAM
Telephone
Hook Switch
ROM
Speaker
MCLK
Keypad
Microcontroller
OSC
PP
Am79C30A DSC Circuit
Figure 14. ISDN Telephone
Am79C30A/32A Data Sheet
LCD Display
Processor
B-Channel
MPI
Interrupt
Audio
MUX
D-Channel
Power Reversal Interrupt
ISDN Feature Phone with Parallel and Serial Data
Ports Plus Other Peripherals
Access to the CCITT R reference interface is provided
via both the serial and parallel ports in Figure 15. This
application may easily have voice capability added by
using a DSC circuit in place of the IDC circuit. Figure 16
illustrates applications with increased B-channel data
processing requirements.
DLC
LIU
Protection
Surge
Controller
Power
Interface
09893H-10
5V
S/T
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