Maxtor 86480D8 Specifications Page 45
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HOST SOFTWARE INTERFACE
6 – 45
Control Diagnostic Registers
These I/O port addresses reference three Control/Diagnostic registers:
I/O PORT READ WRITE
3F6h Alternate Status Fixed Disk Control
3F7h Digital Input Not used
Alternate Status Register
Contains the same information as the Status register in the Task File. However, this register may be read at any
time without clearing a pending interrupt.
Device Control Register
Contains the software Reset bit and the Enable bit to enable interrupt requests to the host. Bit definitions follow:
76543210
00000SRSTIEN0
Reset IRQ Enable
Reset – Setting the software Reset bit holds the drive in the reset state. Clearing the bit re-enables the drive.
The software Reset bit must be held active for a minimum of 5 µsec.
IRQ Enable
– Setting the Interrupt Request Enable to 0 enables the IRQ 14 signal to the host. When this bit is set
to 1, IRQ14 is tri-stated, and interrupts to the host are disabled. Any pending interrupt occurs when the bit is set to 0.
The default state of this bit after power up is 0 (interrupt enabled).
Digital Input Register
Contains information about the state of the drive. Bit definitions follow:
76543210
x -WG -HS3 -HS2 -HS1 -HS0 -DS1 DS0
Reserved Write
Gate
Head
Select 3
Head
Select 2
Head
Select 1
Head
Select 0
Drive
Select 1
Drive
Select 0
Bit 7 of the host data bus is not driven when this register is read.
-Write Gate
– Reflects the state of the active low write gate signal on the drive.
-Head Select 3 through -Head Select 0
– Represents the ones complement of the currently selected head number.
-Drive Select 1
– Is 0 if drive 1 selected; 1 otherwise.
-Drive Select 0
– Is 0 if drive 0 selected; 1 otherwise.
- DiamondMax™ 1750 UDMA 1
- Revisions Manual No. 1381 2
- Before You Begin 3
- Contents 4
- Glossary 6
- Figure Title Page 7
- SECTION 1 8
- Introduction 8
- Conventions 9
- SECTION 2 10
- Product Description 10
- Product Features 11
- Logical Block Addressing 12
- Defect Management Zone (DMZ) 12
- Software ECC Correction 12
- Cache Management 13
- Major HDA Components 14
- 4092 Cylinder Limitation 15
- Subsystem Configuration 15
- Jumper Location/Configuration 15
- SECTION 3 16
- Product Specifications 16
- Physical Dimensions 17
- Power Requirements (Average) 18
- Power Mode Definitions 18
- Environmental 18
- Reliability and Maintenance 19
- Data Reliability 19
- Acoustic Noise 19
- EPA Energy Star Compliance 19
- Shock and Vibration 19
- Standard Test Methods 20
- Safety Regulatory Compliance 20
- SECTION 4 21
- Handling and Installation 21
- Unpacking and Inspection 22
- Repacking 23
- Physical Installation 23
- Drive Jumper Settings 24
- Mounting Drive in System 24
- Figure 4 - 6 25
- 5.25-inch Installation 25
- Figure 4 - 7 25
- 3.5-inch Installation 25
- Figure 4 - 8 26
- Attaching System Cables 27
- System Setup 28
- System Hangs During Boot 29
- Hard Drive Preparation 30
- SECTION 5 31
- AT Interface Description 31
- Pin Description Table 32
- PIO Timing 33
- DMA Timing 34
- Ultra DMA Timing 35
- Figure 5 - 5 36
- Figure 5 - 6 36
- Figure 5 - 7 37
- Figure 5 - 8 37
- Figure 5 - 9 38
- Figure 5 - 10 38
- Figure 5 - 11 39
- Figure 5 - 12 39
- Figure 5 - 13 40
- SECTION 6 41
- Host Software Interface 41
- Sector Count Register 42
- Sector Number Register 42
- Cylinder Number Registers 42
- Device/Head Register 42
- Status Register 42
- Command Register 43
- HOST SOFTWARE INTERFACE 44
- Control Diagnostic Registers 45
- Reset and Interrupt Handling 46
- SECTION 7 47
- Interface Commands 47
- Read Commands 48
- Read DMA 49
- Read Multiple 49
- Set Multiple Mode 49
- Write Commands 50
- Write Multiple 51
- Write DMA 51
- Set Feature Commands 52
- Power Mode Commands 53
- INTERFACE COMMANDS 54
- Initialization Commands 55
- Initialize Drive Parameters 58
- ERROR CODE DESCRIPTION 59
- 01 No error detected 59
- 00 Master drive failed 59
- 81 Slave drive failed 59
- S.M.A.R.T. Command Set 60
- SECTION 8 61
- Service and Support 61
- Service 62
- Internet 62
- Bulletin Board Service 62
- Customer Service 62
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