Task File Registers; Data Register; Error Register; Features Register - Maxtor 2B020H1 Product Manual

Host Software Interface

Host Software Interface
Host Software Interface Host Software Interface Host Software Interface
The host communicates with the drive through a set of controller registers accessed via the host's I/O ports.
These registers divide into two groups: the Task File, used for passing commands and command parameters and
the Control/Diagnostic registers.

Task File Registers

Task File Registers
Task File Registers Task File Registers Task File Registers
The Task File consists of eight registers used to control fixed disk operations. The host accesses each register
by the I/O port address shown in this Task File register map:
I/O POR T R EAD
1F0h

Data Register

1F1h Error Regi ster
1F2h Sector Count
1F3h Sector Number
1F4h C yl inder Low
1F5h C yli nder High
1F6h Drive/Head (SD H)
1F7h Status Regi ster
Data Register Data Register Data Register Data Register Data Register
Provides access to the drive's sector buffer for read and write operations. With the exception of ECC byte
transfers (which, during Read long and Write long commands, are 8 bits wide), data transfers through the
Data register are all 16 bits wide.

Error Register

Error Register Error Register Error Register Error Register
A read-only register containing specific information regarding the previous command. Data interpretation
differs depending on whether the controller is in operational or diagnostic mode. A power up, reset,
software reset, or receipt of a diagnostic command sets the controller into diagnostic mode. This mode
invalidates contents of the Status register. The contents of the Error register reflect a completion code.
Issuing any command (apart from a Diagnostic command) places the controller into operational mode.
In operational mode, the Error register is valid only when the Error bit in the Status register is set. The bit
definitions for operational mode follow:
7 6
0 EC C
Interface D ata
C RC ECC Error
Interface CRC – An interface CRC error occurred during an Ultra DMA transfer.
Data ECC Error – An non-correctable ECC error occurred during a Read Sector command.
Firmware Problem – Indicates a firmware problem was detected, (e.g., invalid interrupt, divide overflow).
ID Not Found – Either a matching ID field not found, or a CRC error occurred.
Aborted Command – Invalid commands, write fault, no seek complete, or drive not ready.
Track 0 Error – Track 0 was not found during execution of a Restore command.
Address Mark Not Found – The Address Mark could not be found after an ID match.

Features Register

Features Register
Features Register Features Register Features Register
Enables or disables features through the Set Features command.
WR ITE
Data Register
F eatures Register
Sector Count
Sector Number
C yl inder Low
C yli nder High
Drive/Head (SD H)
C ommand Regi ster
5 4 3
0 ID NF 0
Not ID Not
Us ed Not Found Us ed
2 1
ABRT TK0 AMNF
Aborted Track 0 Address
Command Error Mark Not
Found
HOST SOFTWARE INTERFACE
SECTION 6
0
6 – 1