Seagate STT8000A, Product Manual

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Theory of operations Chapter 7
STT8000A Product Manual Page 69
Theory of operations
Overview
The STT8000 ATAPI minicartridge drive is based on proven Seagate designs,
Seagate firmware, and the latest technology. This drive uses second generation,
custom LSIs for efficient circuit layout and increased reliability with low power
consumption. The drive also uses flash EEPROM devices for easy firmware
upgrades.
This chapter describes the drive in more detail and explains implementation specific
information.
Block diagram
The electronics of the STT8000 ATAPI minicartridge drive are laid out on one main printed
circuit board (PCB). Figure 7-1 shows a simplified block diagram of the drive components.
Figure 7-1
Simplified block diagram of drive components
IDE
Interface
Digital ASIC
Buffer Mgr.
ECC
RWW
512KB
DRAM
Cartridge Present
Write Protect
Tape Hole
Top Stop
IDE ONLY
Read/Write
PHILIPS
Stepper
Motor
Motor Control
Nat. Semi.
NDM 3000
Head
STTI or
Read/Rite
No RWW
Capstan
Motor
Sensors
256KB
EEPROM
5 Volt
V20 uP
10.0 MHz
40MHz
Crystal
RAWHIDE ( IDE)
Shading denotes
differences from
TR-4 (Bali2)
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