Dreamcast_doc_for_stb(Rev.0819)
Dreamcast
Hardware
Specification Outline
September 3rd 1999 13:43 Sega Enterprises Development Department
Contents
1 Dreamcast Outline 3
1.1 Outline 3
1.2 System Specification 3
1.3 System Block 4
2 CPU:SH4 8
2.1 Features of SH4 8
2.2 SH4 Settings 8
2.3 Main Memory 9
2.3.1 Configuration of the memory 9
2.3.2 SDRAM control 10
2.4 Mapping of the system memory 10
2.5 Interface of CPU bus 11
2.6 Interrupt 11
2.7 PIO i/f 12
2.8 SCI i/f 12
3 Image drawing processor: HOLLY 13
3.1 HOLLY sub system 13
3.2 Chip specification 15
3.3 Pin list 15
3.4 Texture(Texture /Frame Buffer)memory 18
3.5 Internal configuration 19
3.5.1 System Bus 19
3.5.2 Core 19
3.6 Outline of drawing images 22
3.7 Internal configuration 20
3.7.1 PVR block 20
3.7.2 Tile Accelerator (TA)Block 20
3.7.3 System Bus Block 20
3.8 External interface specification 25
3.9 Data path 26
3.10 HOLLYのinterrupt処理 27
§4 Audio processor：AICA 30
4.1 AICA peripheral connection 30
4.2 Chip Specification 30
4.3 Pin specification 31
4.4 Main configuration and spec 32
4.5 Audio memory 33
4.6 RTC(Real Time Clock) 33
4.7 audio in/output 33
4.8 Image mode settings 33
4.9 MIDI interface 33
4.10 Interrupt 33
5 Boot ROM 34
5.1 Boot ROM configuration 34
5.2 Assigning the ROM 34
5.3 About the access cycle to the ROM 34
6 GD-ROM 35
6.1 Specification Outline 35
6.2 Interface 36
6.3 GD-ROM audio 36
7 Other 37
7.1 Control pad 37
7.2 Backup media 37
7.3 Modem 37
7.4 The setting method of the video output and the image mode 38
7.5 Dreamcast Clock Tree 38
7.5.1 PLL 39
7.6 Power supply 39
7.7 Reset Sequence 39
This section is an outline of the Dreamcast system. For individual details please refer to the appropriate sections.
Additionally with regards to the details of the various sections that follow this section, please refer to other material.
A feature of Dreamcast is that it is a system with high quality graphics capability, thanks to its PVR2 core, and superb quality audio which has been produced at a low cost and has a retail price of under $200. Additionally by including a modem as a standard specification, it allows the easy development of network/internet business.
These are the hardware specifications of the basic Dreamcast system.
· CPU: Hitachi SH4 200MHz , Super Scalar RISC Processor , 360MIPs, 1.4GFLOPs
· ASIC: Image drawing VL/NEC HOLLY 100MHz , Audio YAMAHA AICA
· Polygon performance : At peak 3 million polygons/sec ( triangle / quadrilateral ) , 1.5 million polygons/sec visible
· Polygon functions: shadow , tri-linear MIPMAP , edge anti-aliasing, fog, Ｚ buffering etc.
· 16MB Main memory(Can expand to a maximum of 32MB)
· 8MBTexture memory(Can expand to a maximum of 16MB)
· 2MB Boot ROM
· 128KB Flash memory
· 2MB audio memory(Can expand to a maximum of 8MB)
· Audio function: 64ch PCM / ADPCM / FM , 44.1KHz
· 4x～12x CAV-type GD-ROM drive(built-in 128KB buffer RAM)
· 4 Game ports (adapted for the optional light gun, storage device etc.)
· 4 port backup media (optional device)
· RTC(Real Time Clock) that has capability of battery backup
· 33.6kbps modem card
· Adapted for NTSC/PAL, VGA monitor image output
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99/10/25 15:26
Refer to other page
Figure 1-1 Dreamcast Block Diagram
Figure 1-1 is the system block diagram. A simple explanation of each block is below.
CPU
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Amiga78