GPBA01B

© Generalplus Technology Inc.

Proprietary & Confidential

11

MAY 28, 2007

Version: 1.1

7.4. P_21H_BEXPort1 ($0021) (R/W)

Extender Port1 & Function Control (W)

B7

B6

B5

B4

B3

B2

B1

B0

W/R

P1.7

P1.6

P1.5

P1.4

P1.3

P1.2

P1.1

P1.0

W

OSCE

CLKOE

PS1

PS0

1

X

X

X

I/O extender:

P17-P10: bi-direction port to communicate with external device.

The direction is set by B3 of $0023.

Memory extender:

OSCE: Oscillator Enable

CLKOE: Clock Output Enable

PS [1..0]: Pre-scalar Counter

B3: Must be 1.

7.5. P_22H_BEXPort2 ($0022) (R/W)

Extender Port2 & ClockDividerPreload (W)

B7

B6

B5

B4

B3

B2

B1

B0

W/R

P2.7

P2.6

P2.5

P2.4

P2.3

P2.2

P2.1

P2.0

W

CDP7

CDP 6

CDP 5

CDP 4

CDP 3

CDP 2

CDP 1

CDP 0

I/O extender:

P27-P20: bi-direction port to communication with external device.

The direction is set by B4 of $0023.

Memory extender:

CDP [7:0]: Clock divider preload value.

7.6. P_23H_BEXConfig ($0023)(W)

Bus Extender Configuration

B7

B6

B5

B4

B3

B2

B1

B0

W

CFG2

CFG1

CFG0

P55

DIR2

DIR1

DIR03

DIR01

DIR00

CFG [2..0]:

Bus Extender Configuration Number (0~7)

P55:

ExterndPort55 Output Bit (P55 is output pin only)

DIR2:

ExtendPort2 Control (1: Output, 0: Input)

DIR1:

ExtendPort1 Control (1: Output, 0: Input)

DIR03:

ExtendPort0 [7..3] Control (1:Output, 0: Input)

DIR01:

ExtendPort0 [2..1] Control (1:Output, 0: Input)

DIR00:

ExtendPort0.0 Control (1: Output, 0: Input)

Note 1: P55 is available for output only if CFG=0 or 1

Note 2: If the extend port is configured as input, there will be an internal pull-low resistor (37K Ohms @ VDD=5V or 78K Ohms @ VDD=3V).