PS2鼠标规范说明.docx

PS2鼠标规范说明.docx

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PS2鼠标规范说明

PS/2ModeSpecification

Operatingmode

TherearefouroperatingmodesinPS/2mouse:

A.ResetMode:

Inthismodeaself-testisinitiatedduringpower-onorbyaResetcommand.Afterresetsignal,PS/2mousewillsend:

1）.CompletioncodeAA&IDcode00.

2）.Setdefault:

samplingrate:

100reports/s

non-autospeed

2dot/count

disable

B.StreamMode:

Themaximumrateoftransferistheprogrammedsamplerate.Datareportistransmittedif

1）.switchispressed

2）.movementhasbeendetect

C.RemoteMode:

DataistransmittedonlyinresponsetoaReadDatacommand.

D.WrapMode:

Anybyteofdatabythesystem,excepthexEC（Resetwrapmode）orhexFF（Reset）,isreturnedbyMouseController.

PS/2MouseDataReport:

A.Instreammode:

Adatareportissentattheendofasampleinterval.

B.Inremotemode:

AdatareportissentinresponsetoReadDatacommand.

C.Datareportformat:

Byte

Bit

Description

1

0

Leftbuttonstatus;1=pressed

1

Rightbuttonstatus;1=pressed

2

Middlebuttonstatus;1=pressed

3

Reserve

4

Xdatasign;1=negative

5

Ydatasign;1=negative

6

Reserve

7

Reserve

2

0-7

Xdata（D0-D7）

3

0-7

Ydata（D0-D7）

PS/2MouseDataTransmission:

D.MouseControllergeneratestheclockingsignalwhensendingdatatoandreceivingdatafromthesystem.

E.ThesystemrequestsMouseControllerreceivesystemdataoutputbyforcingtheDATAlinetoaninactivelevelandallowingCLKlinetogotoanactivelevel.

F.Datatransmissionframe:

Bit

Function

1

Startbit（always0）

2-9

Databits（D0-D7）

10

Paritybit（oddparity）

11

Stopbit（always1）

G.DataOutput（datafromMouseControllertosystem）:

IfCLKislow（inhibitstatus）,dataisnotransmission.IfCLKishighandDATAislow（request-to-send）,dataisupdated.DataisreceivedfromthesystemandnotransmissionarestartedbyMouseControlleruntilCLKandDATAbothhigh.

IfCLKandDATAarebothHigh,thetransmissionisready.DATAisvalidpriortothefallingedgeofCLKandbeyondtherisingedgeofCLK.Duringtransmission,MouseControllercheckforlinecontentionbycheckingforaninactivelevelonCLKatintervalsnottoexceed100usec.ContentionoccurswhenthesystemlowersCLKtoinhibitMOUSEControlleroutputafterMouseControllerhasstartedatransmission.Ifthisoccursbeforetherisingedgeofthetenthclock,MouseControllerinternalstoreitsdatainitsbufferandreturnsDATAandCLKtoanactivelevel.Ifthecontentiondoesnotoccurbythetenthclock,thetransmissioniscomplete.

Followingatransmission,thesysteminhibitsMouseControllerbyholdingCLKlowuntilcanservicetheinputoruntilthesystemreceivesarequesttosendaresponsefromMouseController.

H.DataInput（fromsystemtoMouseController）:

First,SystemchecksifMouseControlleristransmittingdata.IfMouseControlleristransmitting,thesystemcanoverridetheoutputforcingCLKtoaninactivelevelpriortothetenthclock.IfMouseControllertransmissionisbeyondthetenthclock,thesystemreceivesthedata.

IfMouseControllerisnottransmittingorifthesystemchoosetooverridetheoutput,thesystemforceCLKtoaninactivelevelforaperiodofnotlessthen100usecwhilepreparingforoutput.Whenthesystemisreadytooutputstartbit（0）,itallowsCLKgotoactivelevel.

Ifrequest-tosendisdetected,MouseControllerclocks11bits.Followingthetenthclock,MouseControllerchecksforanactivelevelontheDATAline,andiffound,forceDATAlow,andclockoncemore.Ifoccursframingerror,MouseControllercontinuetoclockuntilDATAishigh,thenclocksthelinecontrolbitandrequestaResend.

Whenthesystemsendsoutacommandordatatransmissionthatrequiresaresponse,thesystemwaitsforMouseControllertoresponsebeforesendingitsnextoutput.

PS/2MouseErrorHandling:

A.AResendcommand（FE）followingreceiptofaninvalidinputoranyinputwithincorrectpolarity.

B.Iftwoinvalidinputsarereceivedinsuccession,anerrorcodeofhexFCsendtothesystem.

C.Thecountaccumulatorsareclearedafterreceivinganycommandexcept"Resend".

D.MouseControllerreceivesaResendcommand（FE）,ittransmititslastpacketofdata.

E.Instreammode,"Resend"isreceivedbyMouseControlleranda3-bytedatapacketwillfollowtotransmittothesystem.MouseControllerresendsthe3-bytedatapacketpriortoclearingthecounter.

F.Aresponseissentwithin25msif

I.Thesystemrequiresaresponse

⒑.Anerrorisdetectedinthetransmission

G.Whenacommandrequiringaresponseisissuedbythesystem,anothercommandshouldnotbeissueuntileithertheresponseisreceivedor25mshaspassed.

PS/2MouseCommandsDescription:

Thereare16validcommandsthattransmittsbetweenthesystemandMouseController.The"FA"codeisalwaysthefirstresponsetoanyvalidinputreceivedfromthesystemotherthanaSetWrapModeorResendcommand.Followingtableisthelistofcommands:

MouseController

HexCode

Command

echocode

FF

Reset

FA,AA,00

FE

Resend

XX,（XX,XX）

F6

SetDefault

FA

F5

Disable

FA

F4

Enable

FA

F3,XX

SetSamplingRate

FA,FA

F2

ReadDeviceType

FA,00

F0

SetRemoteMode

FA

EE

SetWrapMode

FA

EC

ReseWrapMode

FA

EB

ReadData

FA,XX,XX,XX

EA

SetStreamMode

FA

E9

StatusRequest

FA,XX,XX,XX

E8,XX

SetResolution

FA,FA

E7

SetAutospeed

FA

E6

ResetAutospeed

FA

Thefollowingdescribesvalidcommands:

A.Reset（FF）

MouseControlleroperation:

⒐.Completionthereset.

⒑.TransmittedFA,AA,00tothesystem.

⒒.Setdefault:

samplingrate:

100reports/s

non-autospeed

streammode

2dot/count

disable

B.Resend（FE）

⒐.AnytimeMouseControllerreceivesaninvalidcommand,itreturnsaResendcommandtothesystem.

⒑.WhenMouseControllerreceivesaResendcommand,itretransmitsitslastpacketofdata.IfthelastpacketwasaResendcommand,ittransmitsthepacketjustpriortotheResendcommand.

⒒.Instreammode,ifaResendcommandisreceivedbyMouseControllerimmediatelyfollowinga3-bytedatapackettransmissiontothesystem.

C.SetDefault（F6）

Thecommandreinitializesallconditionstothepower-ondefaults.

D.Disable（F5）

ThiscommandisusedinthestreammodetostoptransmissionsfromMouseController.

E.Enable（F4）

Beginstransmissions,ifinstreammode.

F.SetSamplingRate（F3,XX）

Instreammode,thiscommandsetthesamplingratetothevalueindicatedbybytehexXX,showninfollowing:

Second

byteXX

SampleRate

0A

10/sec

14

20/sec

28

40/sec

3C

60/sec

50

80/sec

64

100/sec

C8

200/sec

default100/sec

G.ReadDeviceType（F2）

MouseControlleralwaysechoes"FA,00"followingthiscommand.

H.SetRemoteMode（F0）

DatavaluesarereportedonlyinresponsetoaReadDatacommand.

I.SetWrapMode（EE）

WrapmoderemainsuntilReset（FF）orResetWrapMode（EC）isreceived.

J.ResetWrapMode（EC）

MouseControllerreturnstothepreviousmodeofoperationafterreceivingthiscommand.

K.ReadData（EB）

Thiscommandisexecutedineitherremoteorstreammode.Thedataistransmittedeveniftherehasbeennomovementsincethelastreportorthebuttonstatusisunchanged.FollowingaReadDatacommand,theregistersareclearedafteradatatransmission.

L.SetStreamMode（EA）

ThiscommandsetsMouseControllerinstreammode.

M.StatusRequest（E9）

Whenthiscommandisissuedbythesystem,MouseControllerrespondswitha3-bytestatusreportasfollows:

Byte

Bit

Description

1

0

1=Rightbuttonpressed

1

1=Middlebuttonpressed

2

1=Leftbuttonpressed

3

Reserved

4

0=Normalspeed,1=Autospeed

5

0=Disabled,1=Enabled

6

0=Streammode,1=Remotemode

7

Reserved

2

0-7

Currentresolutionsetting（D0-D7）

3

0-7

Currentsamplingrate（D0-D7）

N.SetResolution（E8,XX）

MouseControllerprovidesfourresolutionsselectedbythesecondbytethesecondbyteofthiscommandasfollows:

Second

ByteXX

Resolution

00

8dot/count

01

4dot/count

02

2dot/count

03

1dot/count

O.SetAutospeed（E7）

Attheendofasampleintervalinthestreammode,thecurrentXandYdatavaluesareconvertednewvalues.Thesignbitearenotinvolvedinthisconversion.Theconversionisonlyinstreammode.Therelationshipbetweentheinputandoutputcountfollows:

Input

Output

0

0

1

1

2

1

3

3

4

6

5

9

N（6）

2.0*N

P.ResetAutospeed（E6）

Thiscommandrestoretonormalspeed.

SerialModeSpecification

InMicrosoftmode,thetransmissioncycleconsistsofthreebytes.Eachbytesisdividedintoonestartbit,sevendatabitsandtwostopbits.Thefirstbytecontains"L","R"switchstatusandfourbitsofthetwomostsignificantbitsinhorizontalcounterandverticalcounter,Thenextbyterepresentsthevalueaccumulatedbyhorizontalcounter,thelastbyteisthedataoftheverticalcount.

Outputbytearrange

bitno.....6543210

1stbyte.....1LRV7'V6'H7H6

2ndbyte.....0H5H4H3H2H1H0

3rdbyte.....0V5'V4'V3'V2'V1'V0'

TimingDiagram