GPBA01B

© Generalplus Technology Inc.

Proprietary & Confidential

5

MAY 28, 2007

Version: 1.1

5. SIGNAL DESCRIPTIONS

Mnemonic

History alias

PIN No.

Type

Description

CI

PCI

17

I

Cascade in for daisy chain

CO

PCO

16

O

Cascade out for daisy chain

AD7 - AD0

PD7 - PD0

4 - 11

I/O

Multiplexing Address/Data bus(AD BUS)

MC1, MC0

PMC1, PMC0

1, 2

I

Input pins to indicate AD bus status

P27(

CE0 )

P26 - P20

XP27 - XP20

27

26 - 20

I/O

P2 are short for P27-P20.

Memory extender

P27(

CE0 ): Memory-0 chip-enable pin

P26-P20: Memory offset address A[14:8].

I/O extender

Input Mode: Pull-low internal

Output Mode: Pure

P17 - P10

XP17 - XP10

37 - 44

I/O

P1 are short for P17-P10.

Memory extender

P17-P10: Memory offset address A[7:0].

I/O extender

Input Mode: Pull-low internal

Output Mode: Pure

P07(

CE1)

P06( CE2 )

P05 - P00

XP07 - XP00

28

29

30 - 35

I/O

P0 are short for P07-P00.

Memory extender

P07( CE1 ): Memory-1 chip-enable pin

P06/( CE2 ): Memory-2 chip-enable pin

P06-P00: Memory bank address B[6:0], GPBA01B support up to 128

banks, each bank is 32K bytes.

I/O extender

Input Mode: Pull-low internal

Output Mode: Pure

OSCO( OE )

PRDZ

18

O

Memory extender

OSCO( OE ): External memories output-enable signal

I/O extender

Output only: 1.84MHz oscillator output

PWRZ

19

O

Memory extender

P55( WE ): External memories write-enable signal

I/O extender

Output only control by B5 of $0023

XI

XTAL1

12

I

1.84 MHz crystal input (20p capacitor required)

XO

XTAL2

13

O

1.84 MHz crystal output (20p capacitor required)

CLKO

ICLK

15

O

Clock divider output

VDD

36

I

Positive supply

VSS

3

I

Ground reference

DVP

14

I

Test mode, please leave it open.

Pull-low internal.

Note1: Fully compatible with GPBA01A, expect DVP mode is discarded.

Note2: There are built-in pull low resistors at all input and bi-direction pins except AD [7:0], MC0, MC1, CI.

The pull low resistors of bi-direction pin are

disabled when working in output mode.

Note3: Internal pull-low resistor with value of approx. 37K Ohms @ VDD = 5.0V; 78K Ohms @ VDD = 3.0V.

Note4: Generalplus strongly recommend user use Mnemonic name instead of History alias for easy understanding.

Note5: Physical addresses are concatenated from {B [6:0], A [14:8], A [7:0]}.