Sega 32X manuals

Sega 32X Manual (102 pages)

Brand: Sega | Category: Internal hard drives | Size: 1.58 MB |

English

Table of contents

Hardware Manual

1

Doc. #MAR-32-R4-072294

1

Terminology

4

Contents

5

1. Introduction to 32X

7

New Screen Offered

8

New Sounds Offered

8

High-Speed Microprocessor

8

Development Language

8

2. Configuration

9

Figure 2.1 32X Block Diagram

10

MEGA Drive I/F Component

11

32X Cartridge Component

11

SH2 Component

11

SDRAM Component

12

Frame Buffer Component

12

VDP Component

12

Color Palette Component

13

PWM Component

13

3. Functions

14

MEGA Drive Memory Map

15

ROM Access when using the 32X

16

Access to the 32X VDP

16

SH2 Memory Map

17

Figure 3.2 SH2 Memory Map

17

Cache Area Access

18

Cartridge ROM Access

18

32X VDP Access

18

1.5. Registers

19

Using the 32X

21

Interrupt issued for SH2

22

Switches ROM Cartridge Bank

22

(Acces : Word)

24

(Access : Word)

24

(Acces: Byte/Word)

25

(Access : Byte/Word)

25

(Access: Byte/Word)

26

[SH2 side]

28

(Access : Byte/Word)

28

PWM Interrupt Clear Register

30

(Access : Word)

32

VDP Registers

36

1.6. VDP

39

Figure 3.4 32X VDP Mapping

41

Switching Frame Buffers

42

Figure 3.7 Over Write Image

45

Line Table Format

47

Figure 3.8 Line Table Format

47

Priority

48

Figure 3.9 Priority

48

Direct Color Mode

49

Figure 3.10 Direct Color Mode

49

Packed Pixel Mode

50

Figure 3.11 Packed Pixel Mode

50

Screen Shift Control

51

Run Length Mode

52

Figure 3.13 Run Length Mode

52

FILL Function

53

Before Fill

53

After Fill

53

Mega Drive Master Clock Cycle

54

68000 Clock Cycle

54

SH2 Clock Cycle

54

VDP Register Latch Timing

56

1.7. PWM

57

Master and Slave

62

Note 2 : See next page

63

Figure 3.25 SH2 Address

64

V: valid bit

64

Purge (Cache Initialization)

66

CPU Write

67

Flow of Data

67

Master-Slave Communication

68

Communication Port

69

CMD Interrupt

69

4. 32X Block Access

72

SH2 Address Space

73

Cache-through Access

74

VDP Access Competition

74

ROM Access Competition

74

Competition with other CPUs

76

Frame Buffer Access

76

32X Mode and Cartridge ROM

77

Frame Buffer

77

VDP Register

78

System Register

78

Boot ROM

78

SDRAM Access Time

78

5. Other

79

Initial Program

83

Security

83

6. Annexes

88

1.16. Master Boot ROM

89

1.17. Initial program

95

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