Audio Dac - Panasonic 3DO FZ-1 Service Manual

1-5. Block Explanation
CPU
CPU is ARM60. This RISC
type
micro processer has 32-bit address and 32-bit data path.
MADAM supplies CPU with 12.5 MHz clock.
ROM
1 MB ROM stores the system management program. The ROM is connected to Slow bus and its data is
read by MADAM and MADAM arranges 8-bit data into 32-bit word and send it to CPU.
SAAM
32 KB SRAM is connected to Slow bus. Since Lithium battery backs up SRAM while power is down,
SRAM can retain data. It may be used to back up game data, for example.
DRAM/VRAM
DRAM and VRAM is used as main memory.
VRAM is dual-port memory. This means one port is used as normal DRAM and the other one is used to read
and write data simultaneously with the former port. Therefore, it is used as Frame Buffer which is required
fast access.
MADAM
MADAM is Address Engine. It includes OMA logic, CPU control logic, bus sharing logic and Cell Engine.
A oscillator provides MADAM with 50 MHz clock, and MADAM divides it by two, and it provides CLIO, CPU
and CD-ROM interface with 25 MHz clock.
CLIO
CLIO is Data Engine. It includes pixel decoding logic, 16-bit Digital Signal Processer and video interface
logic. With a crystal, CLIO oscillates 24.5454 MHz ( [g) or 29.5 MHz ( ~) clock and supplies MADAM with
24.54 MHz ( [g) or 29.5 MHz (~)and supplies Digital Color Encoder with 12.27 MHz ( [g) or 14.75 MHz
(~)-
Digital Color Encoder
CLIO supplies Digital Color Encoder with RGB data and some control signals. And Digital Color Encoder
modifies them into NTSC or PAL signals. It outputs both composit signal and Y/C signal.
Audio DAC
16-bit Audio DAC converts digital audio data from CLIO into analog audio data.
CLIO sends DAC data with serial communication manner.
CD-ROM interface
CD-ROM interface Gate Array is the interface between CLIO and both internal CD-ROM drive and External
drives which are connected through Expansion Port.
1-6
FZ-1