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GL310MC3D

PS/2 3D Mouse Controller

Genesys Logic 

GL310MC PS/2 3D Mouse Controller

device as it would a typical three-button mouse. Note that a Reset ($FF) command will return a

mouse device to its power-up default mode.

4.6 Data reporting

The mouse supports one format for motion data packets. The default Relative format is compatible

with standard PS/2 mice.

Data packets are sent in response to Read Data ($EB) commands. If Stream mode is selected and

data reporting is enabled, data packets are also sent unsolicited whenever finger motion and/or

button-state changes occur.

During transmission of a motion packet, the individual bytes of the packet will be separated by no

more than 10ms (assuming the host does not inhibit the bus). While PS/2 motion packets are lacking

in explicit synchronization bits, if the host sees a long delay between bytes it can assume the delay

comes at a packet boundary. (Similarly, the bytes of the responses to the various PS/2 commands will

be separated by no more than 10ms; the one exception is Reset ($FF), where the $FA and $AA are

separated by a longer calibration delay.)

4.6.1 Default packet format

In the default format, each motion report consists of there bytes. The first byte encodes various

status bits, and the other two bytes encode the amount of motion in X and Y.

Byte 1

Byte 2

Byte 3

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

Y ovfl X ovfl Y sign X sign

1

Middle Right Left

X delta

Y delta

Y ovfl:

X ovfl:

Y sign:

X sign:

Middle:

Right:

Left:

X delta :

Y delta :

1 = Y delta value exceeds the range-256….255, 0 = no overflow. When

this bit is set, the reported Y delta will be either -256 or +255.

1 = X delta value exceeds the range-256….255, 0 = no overflow. When

this bit is set, the reported Y delta will be either -256 or +255.

1 = Y delta value is negative, 0 = Y delta is zero or positive.

1 = X delta value is negative, 0 = Y delta is zero or positive.

1= Middle button is currently pressed, 0 = released.

1= Right button is currently pressed, 0 = released.

1= Left button is currently pressed, 0 = released.

This is the amount of motion that has occurred in the X (horizontal)

direction since the last motion data report. This byte and the "X sign' bit

of byte 1 combine to from a nine-bit signed, two's-complement integer.

This is the amount of motion that has occurred in the Y (vertical)

direction. Upward motion is positive, downward is negative.

11

Revision 1.0 July/16/1998

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