GPBA01B datasheet(4/29 Pages) GENERALPLUS

4 / 29 page

GPBA01B

Proprietary & Confidential

MAY 28, 2007

Version: 1.1

BUS EXTENDER

1. GENERAL DESCRIPTION

GPBA01B,

low

cost

8-bit

bus

extender

(BEX)

GENERALPLUS, manipulates two pins, MC0 and MC1, to receive

the multiplexed 8-bit address/data bus from main processor, e.g.

GENERALPLUS GPL13x and GPLB3x and…etc.

GPBA01B is

able to facilitate the expansion of memory capacity up to 4M bytes

of RAM/ROM/EPROM/FLASH, or 25 I/O pins.

Users may

concatenate numbers of GPBA01B (up to 7) to fit application

needs.

Plus, GPBA01B equips a Clock divider to easily generate

clock for IR application or any other applications.

As compared

with GPBA01A, majority of functions are identical, but AC

characteristics have better performance and DVP mode is phased

out.

2. FEATURES

Fully compatible with GPBA01A expect DVP mode

A speed-up version of bus extender*:

One GPBA01B Expansible up to 4M bytes or 25I/Os.

Daisy chain logic concatenates up to 7 extenders

Supports varieties of memory types: SRAM, ROM, EPROM,

EEPROM and FLASH

Note: when co-work with Generalplus controller, e.g. GPL13X or GPLB3X

series and GPR23LXXX Mask ROM series, it is applicable to

4MHz@2.4V 6MHz@3.6V.

3. APPLICATION FIELD

Memory extension, I/O extension for data bank and any others.

4. BLOCK DIAGRAM

4.1. Work as Memory Extender

MC[1:0]

AD[7:0]

GPBA01B

OUT

MC[1:0]

AD[7:0]

MPU

AT29C040

D[7:0]

A[21:0]

Flash

Memory

GPL131/GPLB31,...)

4.2. Work as I/O Extender

MC[1:0]

AD[7:0]

GPBA01B

OUT

MC[1:0]

AD[7:0]

MPU

Key Matrix

P17-P10

P27-P20

P07-P00

(GPL131/GPLB31,...)

4.3. GPBA01B Block Diagram

A/D bus

control

Address

latch

Bank

Daisy chain

IO/Addr

Multiplexing

Clock

Divider

MC1

MC0

AD[7:0]

XO CLKO

ce z

wrz

rdz

a[15:0]

d[7:0]

AHG

ALG

P0[7:0]

P1[7:0]

P2[7:0]

P55(WE)

OSCO(OE)

P0[6:0](B[7:0])

P27(CE0)

P07(CE1)

P06(CE2)

P1[7:0](A[7:0])

P2[6:0](A[14:8])

GPBA01B Datasheet(PDF) 4 Page - Generalplus Technology Inc.

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