PIXIPOINT?_技术文档

Technical Reference Manual

PixiPoint® Extended PS/2 Protocol

Specification

Preliminary

Document Number: DOC7-PXZ-TR-069

Date: February, 2002

Semtech Corporation

INTELLECTUAL PROPERTY DISCLAIMER

This specification is provided “as is” with no warranties whatsoever including any warranty of merchantability,

fitness for any particular purpose, or any warranty otherwise arising out of any proposal, specification or

sample.

A license is hereby granted to reproduce and distribute this specification for internal use only. No other

license, expressed or implied to any other intellectual property rights is granted or intended hereby. Authors

of this specification disclaim any liability, including liability for infringement of proprietary rights, relating to the

implementation of information in this specification. Authors of this specification also do not warrant or

represent that such implementation(s) will not infringe such rights.

All product names are trademarks, registered trademarks, or servicemarks of their respective owners.

PixiPoint® extended PS/2 spec

Preliminary

Table of contents

Semtech Corporation

MouseCoder product

Table of contents

Chapter 1 / PixiPoint ® extended PS/2 protocol

specification

Document revisions

1-1

1-3

1-5

Normal operations

Extended operations

Commands for the proprietary controls

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Table of contents

PixiPoint® extended PS/2 spec

Preliminary

Semtech Corporation

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PixiPoint® extended PS/2 spec

Preliminary

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PixiPoint® extended PS/2 specification

Document revisions

Document revision history

Date

Version

Comments

2002/02/21 0.69

1999/10/21 0.68

C.A. Edited for Semtech; terminology updates

V.M. Added ESR.b6 (Disable USAR Gesture), defined default values for

the XY / Z Gain and Direction Register when the Select pin is grounded.

1999/09/17 0.67

1999/09/16 0.66

C.A. Reformatted and edited. Added a table listing the commands.

V.M. Added commands and Table 5 for Direction control, changed

logistics of Extended PS/2 commands and USAR “knocking” / Device ID.

1999/08/18 0.65

1999/08/12 0.64

V.M. Added setting for disabling of the Z axis sampling (in Tap Sensitivity

Register), Note for ESR.b1-b3, and changed wording in EStatus Register

V.M. Added levels for Tap Sensitivity, Note for the value of the Extended

Status Register, and changed text for the Power-down command

1999/07/02 0.63

1999/05/07 0.62

1999/05/06 0.61

1999/04/22 0.60

V.M. Added commands for Z Gain and Code CheckSum

V.M. Corrected size of Extended Status Register (Table 4)

V.M. Added commands for Device Type, Version, and XY Gain

V.M. First Draft

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PixiPoint® extended PS/2 specification

Normal operations

At power-up or reset, the PixiPoint® PS/2 pointing device acts as a standard

legacy three-button mouse; as such, it fully supports all applicable PS/2

commands, issues three-byte reports, and has a device ID equal to zero. It

can also be switched into wheelmouse mode by the special wheelmouse

command sequence; in wheelmouse mode, it fully supports all PS/2

commands a standard wheelmouse supports, issues four-byte reports, and

has a device ID equal to three.

These standard functions do not affect or interfere with the PixiPoint®

extended PS/2 protocol or its proprietary controls.

Extended operations

The PixiPoint® extended PS/2 protocol includes (currently) 14 commands,

0xC0 through 0xCD. All these PixiPoint® extended PS/2 commands are

available at any time regardless of the current mode of the device (either

standard legacy mode with ID 0 and 3-byte reports, or wheelmouse mode

with ID 3 and 4-byte reports).

In order to determine whether the device can accept the PixiPoint®

extended PS/2 commands, the driver should perform a special "sequential"

(a.k.a. "knocking") command, shown in Table 1 below. All elements of this

sequential command are valid mouse commands, but the exact order and

number of these commands are very unlikely to happen during operations of

a standard mouse driver. The last command in the set is "Read device type"

(0xF2). A PixiPoint® extended PS/2 protocol device responds to this

command by returning a special value device ID; which value it returns

depends on its capabilities. A special value is returned for the device ID

only for a single "Read device type" (0xF2) command issued as part of the

special sequential command. Other "Read device type" (0xF2) commands,

not issued as part of the special sequential command, return the standard

device ID for the current mode, either 0 or 3.

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Read PixiPoint® extended ID sequential command

Command / data description

Host Data

0xF3

Device Data

0xFA

Set sampling rate

Acknowledgement

80 reports/second

Acknowledgement

Set Sampling Rate

Acknowledgement

60 reports/second

Acknowledgement

Set sampling rate

Acknowledgement

100 reports/second

Acknowledgement

Read device type

Acknowledgement

PixiPoint® extended device ID

0x50

0xF3

0x3C

0xF3

0x64

0xF2

0xFA

0x20

Table 1. Read PixiPoint® extended ID sequential command

The driver must check the device ID returned by the sequential command.

Normal-mode-only pointing devices should always return a device ID of

0x00 or 0x03. If a device ID other then 0x20 is returned, it can not be

assumed that the device can properly process PixiPoint® extended PS/2

commands.

If the correct device ID (0x20) is received, the driver may further initialize the

pointing device with any appropriate proprietary controls, the correct mode

(three-byte or four-byte report mode), the sampling rate, stream/prompt

mode, and issue an Enable command to start operations.

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Commands for the proprietary controls

Proprietary controls for the PixiPoint® pointing device are serviced with the

following commands.

PixiPoint® extended PS/2 commands

Command Command name

byte

Number of data

bytes sent to

PixiPoint®

Number of data bytes

returned by PixiPoint®

(excluding

(excluding command acknowledge bytes)

byte)

0xC0

0xC1

0xC2

0xC3

0xC4

0xC5

0xC6

0xC7

0xC8

0xC9

0xCA

0xCB

0xCC

0xCD

Set tap sensitivity

Set translation profile

Read extended status

Write extended status

Power down

Read device type

Read device version

Read XY gain

Write XY gain

Read Z gain

Write Z gain

Read Checksum

Read direction

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

3

1

0

Write direction

Table 2. List of PixiPoint® extended PS/2 commands

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Set tap sensitivity (0xC0)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with Acknowledge (0xFA). The

value of the second byte is written to the tap sensitivity register which

controls the tapping sensitivity of the PixiPoint® as shown in the following

table.

Tap sensitivity register

Value

0x00

0x01

Meaning

OFF

Soft

Comment

Tap feature is disabled

Default, recommended setting

0x02

-

0x03

Medium

0x04

-

0x05

Hard

0x06

-

0x07

Very Hard

0x08 – 0x7F

0x80

0x81 – 0xFF

-

All these values are reserved

Z-axis sampling is stopped

All these values are reserved

OFF

-

Table 3. Tap sensitivity register

Note: If Z-axis functionality is not required, some 25% savings in power

consumption by the PixiPoint® can be realized by termination of the Z-axis

sampling. Whenever the value of the tap sensitivity register changes to or

from the value of 0x80, the PixiPoint® performs a self-calibration cycle of

approximately 500 ms duration. The sensor should not be touched while the

self-calibration cycle is in progress.

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Set translation profile (0xC1)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with Acknowledge (0xFA). The

value of the second byte controls the translation profile between the force on

the PixiPoint® sensor and relative motion as shown in the following table.

Translation profile register

Value

Meaning

Comment

0x00

0x01 – 0xFF

Semtech Profile #1

Default, recommended setting

All these values are reserved

Table 4. Translation profile register

Read extended status (0xC2)

The extended mode device responds to the command byte with an

Acknowledge (0xFA), and then returns a one-byte value. See the section on

the Write extended status command for the description of the extended

status register.

Write extended status (0xC3)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with Acknowledge (0xFA). The

value of the second byte is written to the extended status register. See

Table 5 below for the description of individual bits.

Note: Possible values for the extended status register are 0x00 to 0x7F (i.e.

it is NOT required to pass "special" values like 0xFF, 0xFE, etc. via the 8042

host).

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Extended status register

Bit

number

Name

Default / Comment

power-

up value

0

Right Primary Enable

Left Wakeup Enable

0

When set (=1) this bit directs sensor press activation to the

Right button.

When this bit is reset (=0) sensor press activation is directed

to the Left button.

When set (=1) AND the PixiPoint® is in the extra-low-power

mode, press on the Left Button triggers generation of the Left

Button Press (and, possibly, zero motion) report.

When cleared (=0), the Left button is driven low and ignored

in the extra-low-power mode mode. See note below.

When set (=1) AND the PixiPoint® is in the extra-low-power

mode, press on the Right Button triggers generation of the

Right Button Press (and, possibly, zero motion) report.

When cleared (=0), the Right button is driven low and

ignored in the extra-low-power mode mode. See note below.

When set (=1) AND the PixiPoint® is in the Zero-Power

mode, press on the Middle Button triggers generation of the

Middle Button Press (and, possibly, zero motion) report.

When cleared (=0), the Middle button is driven low and

ignored in the extra-low-power mode mode. See note below.

1

2

3

0

Right Wakeup Enable

0

Middle Wakeup

Enable

4

Middle Normal Mode

0

When set (=1) this bit forces normal operation of the Middle

switch. In “Middle Normal Mode” PixiPoint® always sends

Z_Data=0, and Middle button event in response to the

Middle switch activation.

When cleared (=0), the middle switch controls generation of

Z_Data, and/or clicks, and/or presses of the middle button,

used in panning and scrolling operations with the “standard”

wheel mouse driver, as permitted by the setting of bit 6.

If the device operates in the normal (3-Byte) Mouse mode,

normal operation of the Middle button is enforced even if this

bit is cleared (=0).

5

6

Slow Drag Disable

0

When set (=1) this bit disables slowing-down of the cursor

speed when primary button is activated by sensor press.

When cleared (=0), the speed of the cursor is reduced when

primary button is activated by sensor press.

When set (=1) this bit inhibits reporting of all Middle button

events, and forces the PixiPoint® to send Z_Data in response

to the force in the Y direction when the Middle switch is

pressed.

Semtech Gesture

Disable

When cleared (=0), the generation of Z_Data and Middle

button events is controlled by the Semtech Gesture

Algorithm.

If the device operates in the normal (3-Byte) Mouse mode,

state of this bit has no effect on the operation of the device.

7

Reserved

0

Ignored, keep cleared (=0)

Table 5. Extended status register

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Note: If reports from the PixiPoint® are disabled while the "Power down"

command is issued, the left, middle, and right buttons' pins are driven low

and ignored in extra-low-power mode, regardless of the state of bit 1

through bit 3 of the extended status register.

Power down (0xC4)

The extended mode device responds to the command byte with

Acknowledge (0xFA). The "Power down" command forces the PixiPoint®

into extra-low-power mode.

If external PS/2 device is connected to the pass-through PS/2 port, the

PixiPoint® receives but ignores any motion reports from the external device

until the PixiPoint® returns to normal operating mode. The PixiPoint®

operates in normal (high) power mode for the duration of the transmissions

from the external PS/2 device, but returns to extra-low-power mode as soon

as the transmissions finish. Hot-plug of the external PS/2 pointing device

operates normally in extra-low-power mode.

The PixiPoint® receives and acknowledges all commands from the host

while it is in extra-low-power mode by temporarily resuming normal

operations for the duration of transmission, but returns to extra-low-power

mode immediately after the last Acknowledge to host is transmitted (see the

two exceptions below).

To resume normal operations, the host should do one of these two actions:

1. Issue an Enable (0xF4) command. In this case reinitialization is not

needed, and normal operations commence after a brief recalibration

delay (~500ms; all communications are active during recalibration).

2. Issue a Reset (0xFF) command and re-initialize the PixiPoint®.

Read device type (0xC5)

The extended mode device responds to the command byte with

Acknowledge (0xFA), and then returns a one-byte value. This data is used

for identification of the IC; it is hard-coded in the firmware.

Read device version (0xC6)

The extended mode device responds to the command byte with

Acknowledge (0xFA) , and then returns a one-byte value. This data is used

for identification of the IC; it is hard-coded in the firmware.

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Read XY Gain (0xC7)

The extended mode device responds to the command byte with

Acknowledge (0xFA), and then returns a one-byte value. See the "Write XY

gain" command for the description of the data.

Write XY gain (0xC8)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with Acknowledge (0xFA). The

value of the second byte is written to the XY gain register. This parameter

allows fine control of the gain in the X/Y (but not Z) A/D processing

channels, in order to accommodate various sensors and/or heights of the

sensors. Power-up value is 0x80 (Gain=1, weight of individual bit = TBD) if

the Select pin (pin 19) is floating. Power-up value is 0x6C if the Select pin

(pin 19) is grounded.

Read Z gain (0xC9)

The extended mode device responds to the command byte with

Acknowledge (0xFA), and returns a one-byte value. See the "Write Z gain"

command for the description of the data.

Write Z gain (0xCA)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with an Acknowledge (0xFA). The

value of the second byte is written to the Z gain register. This parameter

allows fine control of the gain in the Z (but not X/Y) A/D processing channel,

in order to accommodate various sensors. Power-up value is 0x80 (Gain=1,

weight of individual bit = TBD) if the Select pin (pin 19) is floating. Power-up

value is 0x58 if the Select pin (pin 19) is grounded.

Read CheckSum (0xCB)

The extended mode device responds to the command byte with

Acknowledge (0xFA), and then calculates and returns a three-byte value

(24-bit CheckSum). This command is intended for generation of the digital

signature of the firmware, and quick manufacturing test of the ROM-mask

devices. The data set consisting of data returned by "Read device type,"

"Read device version," and "Read CheckSum" is constant (i.e., for a device

with the specific Type and Version, the CheckSum can only have a single,

non-changing value). The range of ROM addresses over which the

CheckSum is calculated is preset in the device's firmware and can not be

changed.

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Read direction (0xCC)

The extended mode device responds to the command byte with

Acknowledge (0xFA), and returns a one-byte value. See the "Write

direction" command for the description of the data.

Write direction (0xCD)

This command byte is followed by one byte of data. The extended mode

device responds to each of the two bytes with an Acknowledge (0xFA). The

value of the second byte is written to the direction register. This register

allows control of the direction (swapping of X and Y signals), and polarity of

the X, Y, and Z signals, in order to accommodate various sensors. Power-

up value is 0x00 if the Select (pin 19) is floating. Power-up value is 0x80 if

Select (pin 19) is grounded. See Table 6 (Direction register) below for the

description of individual bits.

Direction register

Bit

Description Power-up value Power-up value Comment

(when Select is (when Select is

number

floating)

grounded)

0

1

2

3

X sign

0

A value of 1 inverts the X

signal

A value of 1 inverts the Y

signal

A value of 1 swaps the X

and Y signals

A value of 0 inverts the Z

signal

Y sign

0

1

XY swap

Z sign

4

5

6

7

Reserved

0

Ignored, keep cleared

Table 6. Direction register

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For sales information

and product literature,

contact:

Semtech Corporation

Human Interface Device (HID)

and System Management Division

200 Flynn Road

Camarillo, CA 93012-8790

sales@semtech.com

http://www.semtech.com/

(805)498-2111 Telephone

(805)498-3804 Fax

No part of this document may be reproduced in any way without

the express written consent of Semtech Corporation. Semtech and

PixiPoint are registered trademarks of Semtech Corporation. All

trademarks belong to their respective companies. Semtech

Corporation reserves the right to make changes without further

notice to any products herein to improve reliability, function, or

design. Semtech Corporation does not by this document convey

any license under its patent and copyright rights nor the rights of

others.

This specification is provided "as is" with no warranties whatsoever

including any warranty of merchantability, fitness for any particular

purpose, or any warranty otherwise arising out of any proposal,

specification or sample. Authors of this specification disclaim any

liability, including liability for infringement of proprietary rights,

relating to the implementation of information in this specification.

Authors of this specification also do not warrant or represent that

such implementation(s) will not infringe such rights.


型号：	PIXIPOINT?
厂家：	ETC
描述：	PixiPoint? Extended PS/2 Protocol Specification (116k) PixiPoint ？扩展PS / 2协议规范（ 116K ）\n
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