H83069RF datasheet(166/1003 Pages) RENESAS

166 / 1003 page

Rev. 5.0, 09/04, page 144 of 978

Table 6.4

Data Buses Used and Valid Strobes

Area

Access

Size

Read/Write

Address

Valid Strobe

Upper Data Bus

15 to D8)

Lower Data Bus

7 to D0)

8-bit

Byte

Read

—

Valid

Invalid

access

area

Write

—

HWR

Undetermined

data

16-bit

Byte

Read

Even

Valid

Invalid

access

Odd

Invalid

Valid

area

Write

Even

HWR

Valid

Undetermined

data

Odd

LWR

Undetermined

data

Valid

Word

Read

—

Valid

Write

—

HWR, LWR

Valid

Notes: 1. Undetermined data means that unpredictable data is output.

2. Invalid means that the bus is in the input state and the input is ignored.

6.4.4

Memory Areas

The initial state of each area is basic bus interface, three-state access space. The initial bus width

is selected according to the operating mode. The bus specifications described here cover basic

items only, and the following sections should be referred to for further details: Sections 6.4, Basic

Bus Interface, 6.5, DRAM Interface, and 6.8, Burst ROM Interface.

Area 0: Area 0 includes on-chip ROM, and in ROM-disabled expansion mode, all of area 0 is

external space. In ROM-enabled expansion mode, the space excluding on-chip ROM is external

space.

When area 0 external space is accessed, the

0 signal can be output.

Either basic bus interface or burst ROM interface can be selected for area 0.

The size of area 0 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3, 4, and 5.

Areas 1 and 6: In external expansion mode, areas 1 and 6 are entirely external space.

When area 1 and 6 external space is accessed, the

and

6 pin signals respectively can be

output.

Only the basic bus interface can be used for areas 1 and 6.

The size of areas 1 and 6 is 128 kbytes in modes 1 and 2, and 2 Mbytes in modes 3, 4, and 5.

H83069RF Datasheet(PDF) 166 Page - Renesas Technology Corp

H83069RF Datasheet(HTML) 166 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL