W83627EHG Nuvoton Technology Corporation of America, W83627EHG Datasheet - Page 128

• Manufacturer Part Number: W83627EHG
• Description: IC I/O CONTROLLER 128-QFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627EHG

• Applications: PC's, PDA's
• Interface: LPC
• Voltage - Supply: 3.3V
• Package / Case: 128-XFQFN
• Mounting Type: Surface Mount
• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The FDC is also capable of interfacing directly to perpendicular recording floppy drives. Perpendicular
recording differs from the traditional longitudinal method in that the magnetic bits are oriented vertically.
This scheme packs more data bits into the same area.
FDCs with perpendicular recording drives can read standard 3.5" floppy disks and can read and write
perpendicular media. Some manufacturers offer drives that can read and write standard and
perpendicular media in a perpendicular media drive.
A single command puts the FDC into perpendicular mode. All other commands operate as they
normally do. Perpendicular mode requires a 1 Mbps data rate for the FDC, and, at this data rate, the
FIFO manages the host interface bottleneck due to the high speed of data transfer to and from the disk.
FDC Core
The W83627EHF/EHG/EF/EG FDC is capable of performing twenty commands. Each command is
initiated by a multi-byte transfer from the microprocessor, and the result may be a multi-byte transfer
back to the microprocessor. Each command consists of three phases: command, execution, and result.
Command
The microprocessor issues all required information to the controller to perform a specific operation.
Execution
The controller performs the specified operation.
Result
After the operation is completed, status information and other housekeeping information are provided
to the microprocessor.
The next section introduces each of the commands.
8.1.5
Command Symbol Descriptions:
C:
D:
DIR:
FDC Commands
Cylinder Number 0 - 256
Data Pattern
Step Direction
DIR = 0: step out
W83627EHF/EF, W83627EHG/EG
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Publication Release Date: April 7, 2009
Version 1.94