Maxtor 6800 manual DMA Timing

Page 35

AT INTERFACE DESCRIPTION

DMA Timing

TIMING PARAMETERS

MODE 0

MODE 1

MODE 2

t0

Cycle Time (min)

480 ns

150 ns

120 ns

tC

DMACK to DMARQ delay

tD

DIOR-/DIOW- (min)

215 ns

80 ns

70 ns

tE

DIOR- data access (min)

150 ns

60 ns

tF

DIOR- data hold (min)

5 ns

5 ns

5 ns

tG

DIOR-/DIOW- data setup (min)

100 ns

30 ns

20 ns

tH

DIOW- data hold (min)

20 ns

15 ns

10 ns

tI

DMACK to DIOR-/DIOW- setup (min)

0

0

0

tJ

DIOR-/DIOW- to DMACK hold (min)

20 ns

5 ns

5 ns

tKr

DIOR- negated pulse width (min)

50 ns

50 ns

25 ns

tKw

DIOW- negated pulse width (min)

215 ns

50 ns

25 ns

tLr

DIOR- to DMARQ delay (max)

120 ns

40 ns

35 ns

tLw

DIOW- to DMARQ delay (max)

40 ns

40 ns

35 ns

tZ

DMACK- to tristate (max)

20 ns

25 ns

25 ns

Figure 5 - 3

Multi-word DMA Data Transfer

5 – 4

Image 35

Contents HA RD Drive Produc T MA Nual DiamondMax U T I O N Before You BeginContents Handling and Installation Product SpecificationsHost Software Interface AT Interface DescriptionGlossary Interface CommandsService and Support Figures Abbreviations IntroductionMaxtor Corporation Manual OrganizationNumbering Signal ConventionsConventions Key WordsProduct Description DiamondMax 6800 Key FeaturesFunctional / Interface Product FeaturesSoftware ECC Correction On-the-Fly Hardware Error Correction Code ECCLogical Block Addressing Defect Management Zone DMZAutomatic Write Reallocation AWR Read-Ahead ModeCache Management Buffer SegmentationMajor HDA Components Dual Drive Support Subsystem ConfigurationJumper Location/Configuration Cylinder LimitationModels and Capacities Product SpecificationsDrive Configuration Performance SpecificationsParameter Standard Metric Physical DimensionsEnvironmental Limits Power RequirementsPower Mode Definitions EPA Energy Star ComplianceShock and Vibration Reliability SpecificationsCanadian Emissions Statement Safety Regulatory ComplianceRadiated Electromagnetic Field Emissions EMC Compliance Important Notice Handling and InstallationHard Drive Handling Precautions Pre-formatted DriveMulti-pack Shipping Container Unpacking and InspectionRepacking Physical InstallationRecommended Mounting Configuration Drive Identification Information Handling PrecautionsTools for Installation System RequirementsHard Drive Identification General RequirementsMounting Drive in System Systems Using Cable SelectInstalling 5.25-inch Mounting Brackets and Rails Installing in a Device BayAttaching System Cables Attaching Interface and Power CablesBios Cmos Parameters System SetupSetting the Bios Cmos Hard Drive Preparation System Hangs During Boot Pin Description Summary Interface ConnectorAT Interface Description Pin Description Table PIN Name Signal Name Signal DescriptionPIO Timing Timing Parameters ModeDMA Timing Ultra DMA Timing Mode MIN MAXSustained Ultra DMA Data In Burst Device Terminating an Ultra DMA Data In Burst Initiating an Ultra DMA Data Out Burst Device Pausing an Ultra DMA Data Out Burst Device Terminating an Ultra DMA Data Out Burst Task File Registers Error RegisterFeatures Register Host Software InterfaceDevice/Head Register Sector Count RegisterSector Number Register Cylinder Number RegistersCommand Register Summary Command Name Command Code Parameters Used SDHDigital Input Register Control Diagnostic RegistersAlternate Status Register Device Control RegisterInterrupt Handling Reset and Interrupt HandlingReset Handling Set Feature Commands Interface CommandsRead Verify Sectors Read CommandsRead Sectors Read Multiple Read DMAWrite Verify Sectors Write CommandsSet Multiple Mode Write SectorsWrite DMA Write MultipleSet Features Mode Set Feature CommandsPower Mode Commands Sleep Mode Identify Drive Initialization Commands15-8 = PIO data transfer mode = Write Cache enabled Initialize Drive Parameters Format Track Seek, Format and Diagnostic CommandsExecute Drive Diagnostic Execute S.M.A.R.T A.R.T. Command SetSupport Service and SupportService Policy No Quibble ServiceInternet MaxFax ServiceCustomer Service Glossary Access TimeCylinder Zero Gigabyte GB Logical Block Addressing Read Gate Signal THIN-FILM Media