GPBA01B datasheet(10/29 Pages) GENERALPLUS

10 / 29 page

GPBA01B

Proprietary & Confidential

MAY 28, 2007

Version: 1.1

7. REGISTER DESCRIPTION

7.1. P_00H_BMIBank ($0000) (W)

Bank Selection Register

must be1

BANK6

BANK5

BANK4

BANK3

BANK2

BANK1

BANK0

B6 - B0 are BANK6-BANK0.

The extended memory is dividing

into banks, 32K bytes per bank.

Each AD BUS cycle can only

address up to 32KB.

To access another bank, you should issue

P_00H_BMIBank ($0000) command.

When GPBA01B connects

to one 4MB memory, B6 - B0 are bank selections for total of 128

banks.

In CFG=6 mode, one GPBA01B can support up to three

memory; thus, B6 - B5 act as memory selections while B4 - B0 act

as bank selection.

7.1.1. CFG=3 Example

CFG=3, one 4MB is configured and B6 - B0 are all for 128-bank

selections.

B6-B0

Description

A21

A20

A19

A18

A17

A16

A15

7.1.2. CFG=6 Example

CFG=6, three 1MB are configured and B4 - B0 are for 32-bank

selections.

B6-B5

Description

CE2 will be asserted

CE1 will be asserted

CE0 will be asserted

B6-B0

Description

A19

A18

A17

A16

A15

7.2. P_0DH_BMIVolumeID ($000D) (W)

Bus memory Volume ID Setup & Selection

Write-once

VID2

VID1

VID0

SID2

SID1

SID0

VID [2:0]:

Volume-ID for unique identify the GPBA01B on the daisy-chain, write once only.

SID [2:0]:

Select-ID for selection one of GPBA01Bs on the daisy-chain.

7.3. P_20H_BEXPort0 ($0020)(R/W)

Extender Port0

W/R

P0.7

P0.6

P0.5

P0.4

P0.3

P0.2

P0.1

P0.0

I/O extender:

P07-P00: bi-direction port to communication with external device.

The direction is set by B [2:0] of $0023.

Memory extender:

No function.

GPBA01B Datasheet(PDF) 10 Page - Generalplus Technology Inc.

GPBA01B Datasheet(HTML) 10 Page - Generalplus Technology Inc.

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

Datasheet Download

Link URL