GPBA02A datasheet(16/21 Pages) GENERALPLUS

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GPBA02A

Proprietary & Confidential

JAN. 06, 2011

Version: 1.6

PAD

VSSIO

ATTx=0

BUFx= 0

DIRx

DIRx= 1, NMOS output 0

DIRx= 0, flloating

DATx

Open drain PMOS output:

As shown in the above I/O Cell Configuration table and Control

Registers table, each I/O port can be set as open drain NMOS

output port independently. If PA/B/Cx is expected to be set as

open drain PMOS output port, the corresponding Bx of

00H/01H/02H (BUFA/B/C) should be cleared as 0, and

08H/09H/0AH (ATTA/B/C) should be set as1. If the host write 1

to the corresponding Bx of 04H/05H/06H (DIRA/B/C), the PA/B/Cx

is an open drain PMOS output, and if host write 0 to the

corresponding Bx of 04H/05H/06H (DIRA/B/C), the PA/B/Cx is

floating. In this case, the register DIRx acts as the output data

buffer register. And it is a normal open drain PMOS output port.

PAD

VDDIO

ATTx=1

BUFx= 0

DIRx

DIRx= 0, floating

DIRx= 1, PMOS output 1

DATx

Dynamic pull low input:

As shown in the above I/O Cell Configuration table and Control

Registers table, each I/O port can be set as dynamic Input with

pull low resistor port independently. If PA/B/Cx is expected to

set as dynamic Input with pull low resistor port, the corresponding

Bx of 04H/05H/06H (DIRA/B/C) and 08H/09H/0AH (ATTA/B/C)

both should be cleared as 0.

If the corresponding Bx of

00H/01H/02H (BUFA/B/C) is set as 1, the PA/B/Cx is set as input

with pull low resistor port, and else if the corresponding Bx of

00H/01H/02H (BUFA/B/C) is cleared as 0, the PA/B/Cx is set as

input with high Z port.

PAD

ATTx= 0

DIRx= 0

BUFx

VSSIO

BUFx= 0 input with high Z

BUFx= 1 input with pull low R

DATx

Dynamic pull high input:

As is shown in the above I/O Cell Configuration table and Control

Registers table, each I/O port can be set as dynamic Input with

pull high resistor port independently. If PA/B/Cx is expected to

set as dynamic Input with pull high resistor port, the corresponding

Bx of 04H/05H/06H (DIRA/B/C) should be cleared as 0. And the

corresponding Bx of 08H/09H/0AH (ATTA/B/C) should be set as1.

If the corresponding Bx of 00H/01H/02H (BUFA/B/C) is set as1,

the PA/B/Cx is set as input with pull high resistor port, and else if

the corresponding Bx of 00H/01H/02H (BUFA/B/C) is cleared as 0,

the PA/B/Cx is set as input with high Z port.

PAD

ATTx= 1

DIRx= 0

BUFx

VDDIO

BUFx= 0 input floating

BUFx= 1 input with pull high R

DATx

Note:

Also, there are some other I/O register status combinations that can

archive other IO functions, such as wired OR and wired AND functions.

Users can use these functions dexterously.

5.4.3. Special Functions

The content of ATTA/B/C, BUFA/B/C and DIRA/B/C can be speed

up AND with any data by executing a special write instruction.

According to the command data frame, when user writes data into

will be AND with the current data of this register and then be load

in the exact register again. While executing AND instruction, the

I/O extender reads the primary value of the register. This speed

up AND operation only spends the host a write command cycle.

It is a very useful function for I/Os’ real time control.

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