Quantum FIREBALL PLUS AS 10.2 User Manual

Basic Principles of Operation
5-7 Quantum Fireball Plus AS 10.2/20.5/30.0/40.0/60.0 GB AT
The integrated µProcessor, Disk Controller, and ATA Interface Electronics have
nine functional modules (described below):
•µProcessor
• Digital Synchronous Spoke (DSS)
• Error Correction Code (ECC) Control
• Formatter
• Buffer Controller
• Servo Controller, including PWM
•Serial Interface
• ATA Interface Controller
• Motor Controller
5.2.1.1
5.2.1.15.2.1.1
5.2.1.1 µProcessor
µProcessor µProcessor
µProcessor
The µProcessor core provides local processor services to the drive electronics under
program control. The µProcessor manages the resources of the Disk Controller, and
ATA Interface internally. It also manages the Read/Write ASIC (Application
Specific Integrated Circuit), and the Spindle/VCM driver externally.
5.2.1.2
5.2.1.25.2.1.2
5.2.1.2 Digital Synchronous Spoke
Digital Synchronous SpokeDigital Synchronous Spoke
Digital Synchronous Spoke
The DSS decodes servo information written on the drive at the factory to determine
the position of the read/write head. It interfaces with the read/write channel,
process timing and position information, and stores it in registers that are read by
the servo firmware.
5.2.1.3
5.2.1.35.2.1.3
5.2.1.3 Error Correction Code (ECC) Control
Error Correction Code (ECC) ControlError Correction Code (ECC) Control
Error Correction Code (ECC) Control
The Error Correction Code (ECC) Control block utilizes a Reed-Solomon encoder/
decoder circuit that is used for disk read/write operations. It uses a total of 44
redundancy bytes organized as 40 ECC (Error Correction Code) bytes with one
interleave, and four cross-check bytes. The ECC uses ten bits per symbol and one
interleave. This is guaranteed to correct 150 bits and as many as 160 bits in error.
5.2.1.4
5.2.1.45.2.1.4
5.2.1.4 Formatter
FormatterFormatter
Formatter
The Formatter controls the operation of the read and write channel portions of the
ASIC. To initiate a disk operation, the µProcessor loads a set of commands into the
WCS (writable control store) register. Loading and manipulating the WCS is done
through the µProcessor Interface registers.
The Formatter also directly drives the read and write gates (
RG, WG) and Command
Mode Interface of the Read/Write ASIC and the R/W Preamplifier, as well as
passing write data to the Precompensator circuit in the Read/Write ASIC.

Quantum FIREBALL PLUS AS 10.2 Specifications

General

Brand	Quantum
Model	FIREBALL PLUS AS 10.2
Category	Storage
Language	English