GPBA01B datasheet(7/29 Pages) GENERALPLUS

7 / 29 page

GPBA01B

Proprietary & Confidential

MAY 28, 2007

Version: 1.1

6.3. Example on Address Mapping

1. CI=0

2. CI=1

3. %MOV

P_0DH_BMIVolumeID,#%00000001

4. %MOV

P_23H_BEXConfig,#%1100-0000

; set CFG=6(B[7:5]), three 1MB memory enable

5. %MOV

P_00H_BankSelect,#%1010-0000

; select MEM1’s bank0,(i.e.

CE1 will active when access)

6. %MOV

0x8000, 0x1111

; write 0x1111 to MEM0[0x00000]

7. %MOV

0xBFFF, 0x2222

; write 0x2222 to MEM0[0x03fff]

8. %MOV

0x4000, 0x3333

; write 0x3333 to MEM0[0x04000]

9. %MOV

0x7fff, 0x4444

; write 0x4444 to MEM0[0x7ffff]

10.%MOV

P_00H_BankSelect,#%1010-0001

; select MEM1’s bank1

11.%MOV

0x8000, 0x5555

; write 0x5555 to MEM0[0x08000]

12.%MOV

0xBFFF, 0x6666

; write 0x6666 to MEM0[0x0bfff]

13.%MOV

0x4000, 0x7777

; write 0x7777 to MEM0[0x0c000]

14.%MOV

0x7fff, 0x8888

; write 0x8888 to MEM0[0xfffff]

After consecutive 8 write

ADDRESS

DATA

Memo

00000H

1111H

BANK0, 32KB per bank

…

03FFFH

2222H

04000H

3333H

…

07FFFH

4444H

08000H

5555H

BANK1

…

0BFFFH

6666H

0C000H

7777H

…

0FFFFH

8888H

10000H

…

BANK2

…

6.4. Address Mapping on a System

Bus extender usually use $4000~$BFFF for memory extension,

while $0000~003f for register setting.

Each bank are 32K bytes, $8000H~$BFFFH are mapped to

$0000H~$3FFFH;

$4000H~$7FFFH

are

mapped

$4000H~7FFFH.

ROM

(16KB)

(Bank)H

I/O

$0000-$003F

$2000-$3FFF

$4000-$7FFF

$8000-$BFFF

$C000-$FFF9

$FFFA-$FFFF

CPU View

$00000-$03FFF

$04000-$07FFF

$08000-$0BFFF

$0C000-$0FFFF

$10000-$13FFF

$14000-$17FFF

ROM View

$C000-$FFFF always mapping into 0L

. . .

$0040-$03FF

ROM

(16KB)

(Bank)L

ROM

(16KB)

Ext. RAM

(8KB)

RAM

Interrupt

Sensor Buffer

$0C00-$1FFF

RAM

$0800-$084F

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