W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 141

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

11.1.5 FDC Core
The W83627DHG-P 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.
11.1.6 FDC Commands
Command Symbol Descriptions:
C:
D:
DIR:
DS0:
DS1:
DTL:
EC:
EFIFO:
EIS:
EOT:
FIFOTHR:
GAP:
GPL:
H:
HDS:
HLT:
HUT:
LOCK:
MFM:
MT:
N:
NCN:
ND:
OW:
PCN:
Data Pattern
Step Direction
Disk Drive Select 0
Disk Drive Select 1
Data Length
Head Number Select
Head Load Time
Head Unload Time
Lock EFIFO, FIFOTHR, and PTRTRK bits to prevent being affected by software reset
The number of data bytes written in a sector
New Cylinder Number
Non-DMA Mode
Overwritten
Present Cylinder Number
Cylinder Number 0 - 256
DIR = 0: step out
DIR = 1: step in
Enable Count
Enable FIFO
Enable Implied Seek
End of Track
FIFO Threshold
Gap Length Selection
Gap Length
Head Number
MFM or FM Mode
Multitrack
W83627DHG-P/W83627DHG-PT
-131-
Publication Release Date: July 09, 2009
Version 1.94