Rainbow Electronics AT75C220 - Manual (Page 7)

AT75C220
7
Figure 3. DSP Subsystem Block Diagram
Figure 4. Application Example – Standalone Ethernet Telephone
24K x 16
Program RAM
OakDSPCore
16K x 16
General-
purpose RAM
256 x 16
Dual-port
Mailbox
On-chip
Emulation
Module
2K x 16 X-RAM
2K x 16 Y-RAM
Codec Interface
Bus Interface Unit
DSP Subsystem
ASB
Oak Program Bus Oak Data Bus
VolP
Protocol
Stack
ARM7TDMI Core
External Bus
Interface
SDRAM
Controller
SRAM
Controller
SDRAM
Flash
Speaker
Phone
Interface
Voice
Codec
Voice
Processing
DSP Subsystem Analog Front End
AT75C220
Keyboard Screen
Speaker
Microphone
Handset
Dual-port
Ethernet
10/100 Mbps
MAC
Interface
Ethernet
10/100 Mbps PHY
Ethernet
10/100 Mbps PHY
Network
PC