Bus Phases, Method of driving the interface signal | Fujitsu 600C

Table 4-4 Method of driving the interface signal

	OR connection	NON_OR connection

False	No signal is driven by any	The signal is driven false by
	SCSI device. Signal status is	a certain SCSI device
	made false by the termination	(initiator or target), or is not
	resistor circuits.	driven by any SCSI device
True	A SCSI device drives the signal true.

4.3 Bus Phases

The SCSI architecture includes the following eight distinct phases:

∙	BUS FREE phase
∙	ARBITRATION phase
∙	SELECTION phase	}
∙	COMMAND phase
∙	DATA phase
∙	STATUS phase		INFORMATION TRANSFER phase
∙	STATUS phase
∙	MESSAGE phase

The SCSI bus can never be in more than one phase at any given time.

The following diagram shows how each phase transmits to another.

Reset
		MESSAGE OUT
	SELECTION
		COMMAND
BUS FREE	ARBITRATION	DATA IN or
		DATA OUT
		STATUS

MESSAGE IN

Figure 4-2 Phase sequence

4-9

Image 37

Fujitsu 600C manual Bus Phases, Method of driving the interface signal, Or connection Nonor connection

Contents

Version Page Table of Contents Diagnostics Group 3 error flowchart no paper in ADF paper tray Page General General System Block Diagram Outer View Device Configuration Components Functional Specifications Remarks Functional Specifications Environmental Specifications Remarks Environmental Specifications Removing the Shipping Bracket Operation Remove the shipping retainer Fasten the shipping retainer Indication Panel Power On/Off Names and functions of the indicators Setting the Scsi ID and Connecting the Interface CableScsi ID setting Name Color Function Scsi Cable Connection Position Paper Size Paper SpecificationsPaper conditions 2.1 ADF Items to avoid FIatbed ADF readable area Readable area When the document size is of letter/A4 size or smaller Document Setting MethodFlatbed Setting the ADF paper chute When the document is a thick book2 ADF Placing the document on the ADF paper chute Placing the documents on the ADF paper chute Separating the sheets for easy feeding Angling the document sheets Cleaning the document cover and the document glass Cleaning Cleaning inside the ADF Page Interface ∙ Busy ∙ Check Condition ∙ Good ∙ Reservation Conflict Connection Physical Specifications Specifications Physical Specification1SCSI physical specifications Termination Pin assignments Signal Name Pin Number System configuration System configurationScsi Bus Addresses of Scsi devices 2Bus signals Bus signals 3Bus phases vs. signal drive sources 1/2 Bus signal drive conditions Method of driving the interface signal Bus PhasesOr connection Nonor connection 5Signal delay times definition Time Definition Signal delay times definition BUS Free phaseTime Definition Arbitration phase BSY Scsi SEL Selection phase Information Transfer phase type Phase Information Transfer phasesDB7 to 9,P Transfer Direction Asynchronous transfer from target to initiator Asynchronous information transfer Asynchronous transler from initiator to target Relative addressing is not supported CommandsControl byte is not supported Commands Reserve Unit commandOperation Command Code hex Description Bit and field described as Reserved are TP third party Byte Reserve Unit command Command phase initiator Õ targetTpid third party device ID Byte Release Unit command Command phase initiator → target Release Unit commandTP third party Byte Inquiry command Command phase initiator → target Inquiry command10 Inquiry command Step Bus phase Initiator operation Target operation Code Byte Evpd enable vital product data ByteCAllocation length Byte Aenc Inquiry data Data in phase target → initiator ADF mode Byte 24, bit SftRst Soft Reset ByteColor mode Byte 24, bit 6 to ISO version, Ecma version, Ansi approved version Byte Request Sense command Command phase initiator → target Request Sense command11 Request Sense command Error code Byte Sense data Data EN phase target → initiatorAllocation length Byte Valid Byte FM file mark Byte ILI incorrect length indicator ByteEOM end of medium Byte Sense key Byte Command-specific information bytes Bytes 8 to B Send Diagnostic commandSense Additional Description Sense code PF page format Byte Send Diagnostic command Command phase initiator → targetSlftst selftest Byte Contents of self-test Test Unit Ready commandResults of self-test Acknowledgment Test Unit Ready command Command phase initiator → target SET Window command Command phase initiator → target SET Window command Transfer Length Bytes 6 to Window date Data OUT phase initiator → targetHeader Window descriptor block Window identifier Byte Y resolution XR, YR Bytes 2 to 3 and 4 toAuto Byte Upper left X,YULX, ULY Bytes 6 to 9, a to D Remarks Brightness Byte RIF reverse image format Byte 1D, bit Bit per pixel Byte 1ABit ordering Bytes 1E to 1F Halftone pattern Bytes lB to 1C lB reserved 7.4 B&W Scanning Vender unique parameters Update of ScanPartner 600C OEM manualCompression type, argument Bytes 20 to 18 Vender unique parameters byte 28 and laterPage 19 Vendor unique parameters byte 28 and later Color Scanning Vender unique parametersADF Byte 2A, Bit Source Byte 2A, Bit Shadow value Byte 2C Highlight value Byte 2BLine width Byte 2D to 2E Line count Byte 2F to Object Position command Position type Byte Object Position command Command phase initator → targetBit Load object Unload objectCount Bytes 2 to Normal Step Bus phase Initiator operation Target operation Read commandADF sequence Data type code Byte Read command Command phase initiator → targetData type qualifier Bytes 4 to Transfer length TL Bytes 6 to Image data Data Type Code = Data in phase target → initiatorFor binary data Pixel size data Data Type Code = Scan Command phase initiator → target Scan command Code Status of unit Status Status phase target initiator Messages Phase ATN detection timingATN detection Message types Command Complete X00 Message in phase target → initiatorMessage Message Reject X07 Message IN/OUT phase initiator → target Abort X06 Message OUT phase initiator → targetATN detection phase Action BUS Device Reset X0C Message OUT phase initiator → target No Operation X08 Message OUT phase initiator → targetPhase when ATN is detected Action Message rejected Action Idendify X80 to XFF Message OUT phase initiator → target Initial sequence Command Sequence Read sequence for B&W mode Read command sequenceRead sequence Single Read Multiple Read Status Transition of Logical Unit Sense key Error Table Items for Specifying Window Page Ready LED Paper Jam LED Error indication Online diagnosticsOnline diagnostics Offline diagnostics results Offline diagnostics Group 1 error flowchart Lamp assembly Diagnostic flowchartsGroup 2 error flowchart Flatbed/ADF motor Group 3 error flowchart paper in ADF paper tray Group 3 error flowchart no paper in ADF paper tray