W83877ATG Nuvoton Technology Corporation of America, W83877ATG Datasheet - Page 24

• Manufacturer Part Number: W83877ATG
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83877ATG

• Lead Free Status / RoHS Status: Supplier Unconfirmed

5.1.6
The W83877ATF/ATG supports standard tape drives (1 Mbps, 500 Kbps, 250 Kbps) and new fast
tape drive (2M bps).
5.1.7
The W83877ATF/ATG 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.
5.1.8
Command Symbol Descriptions:
C:
D:
DIR:
DS0:
DS1:
DTL:
EC:
EOT:
EFIFO:
EIS:
EOT:
FIFOTHR:
GAP:
GPL:
H:
HDS:
HLT:
HUT:
LOCK:
MFM:
MT:
N:
Tape Drive
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
FIFO Threshold
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
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W83877ATF/W83877ATG
Publication Release Date:November 2006
Version 1.0