W83977G Winbond Electronics Corp America, W83977G Datasheet - Page 27

• Manufacturer Part Number: W83977G
• Description: W83877TF plus KBC, CIR, RTC, Pb-free
• Manufacturer: Winbond Electronics Corp America

5.1.6
The W83977F/G, W83977AF/AG FDC is capable of performing twenty commands. Each command is
initiated by a multi-byte transfer from the microprocessor. The result can also 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 is provided to
the microprocessor.
5.1.7
Command Symbol Descriptions:
C:
D:
DIR:
DS0:
DS1:
DTL:
EC:
EOT:
EFIFO:
EIS:
EOT:
FIFOTHR: FIFO Threshold
GAP:
GPL:
H:
HDS:
HLT:
HUT:
LOCK:
MFM:
MT:
N:
NCN:
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
FDC Core
FDC Commands
Cylinder number 0 - 256
Data Pattern
Step Direction
DIR = 0, step out
DIR = 1, step in
Disk Drive Select 0
Disk Drive Select 1
Data Length
Enable Count
End of Track
Enable FIFO
Enable Implied Seek
End of track
Gap length selection
Gap Length
Head number
Head number select
Head Load Time
Head Unload Time
Lock EFIFO, FIFOTHR, PTRTRK bits prevent affected by software reset
MFM or FM Mode
Multitrack
The number of data bytes written in a sector
New Cylinder Number
-19 -
Publication Release Date: May 2006
Revision 0.60