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參數(shù)資料
| 型號(hào)： | FDC37B80X |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類(lèi)： | 外設(shè)及接口 |
| 英文描述： | PC98/99 Compliant Enhanced Super I/O Controller with Keyboard/Mouse Wake-Up |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP100 |
| 封裝： | QFP-100 |
| 文件頁(yè)數(shù)： | 51/194頁(yè) |
| 文件大小： | 802K |
| 代理商： | FDC37B80X |
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51
DATA TRANSFER COMMANDS
All of the Read Data, Write Data and Verify type
commands use the same parameter bytes and
return the same results information, the only
difference being the coding of bits 0-4 in the first
byte.
An implied seek will be executed if the feature
was enabled by the Configure command. This
seek is completely transparent to the user. The
Drive Busy bit for the drive will go active in the
Main Status Register during the seek portion of
the command. If the seek portion fails, it is
reflected in the results status normally returned
for a Read/Write Data command. Status
Register 0 (ST0) would contain the error code
and C would contain the cylinder on which the
seek failed.
Read Data
A set of nine (9) bytes is required to place the
FDC in the Read Data Mode. After the Read
Data command has been issued, the FDC loads
the head (if it is in the unloaded state), waits the
specified head settling time (defined in the
Specify command), and begins reading ID
Address Marks and ID fields. When the sector
address read off the diskette matches with the
sector address specified in the command, the
FDC reads the sector's data field and transfers
the data to the FIFO.
After completion of the read operation from the
current
sector,
the
incremented by one and the data from the next
logical sector is read and output via the FIFO.
This continuous read function is called "Multi-
Sector Read Operation". Upon receipt of TC, or
an implied TC (FIFO overrun/underrun), the
FDC stops sending data but will continue to
read data from the current sector, check the
CRC bytes, and at the end of the sector,
terminate the Read Data Command.
sector
address
is
N determines the number of bytes per sector
(see Table 21 below). If N is set to zero, the
sector size is set to 128. The DTL value
determines the number of bytes to be
transferred. If DTL is less than 128, the FDC
transfers the specified number of bytes to the
host. For reads, it continues to read the entire
128-byte sector and checks for CRC errors. For
writes, it completes the 128-byte sector by filling
in zeros. If N is not set to 00 Hex, DTL should
be set to FF Hex and has no impact on the
number of bytes transferred.
Table 19 - Sector Sizes
The amount of data which can be handled with
a single command to the FDC depends upon
MT (multi-track) and N (number of bytes/sector).
The Multi-Track function (MT) allows the FDC to
read data from both sides of the diskette. For a
particular cylinder, data will be transferred
starting at Sector 1, Side 0 and completing the
last sector of the same track at Side 1.
N
00
01
02
03
..
07
SECTOR SIZE
128 bytes
256 bytes
512 bytes
1024 bytes
...
16 Kbytes
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| FDC37C665IR | 3/5 Volt Advanced High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controller with Infranred Support |
| FDC37C665GT | High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers |
| FDC37C666GT | High-Performance Multi-Mode Parallel Port Super I/O Floppy Disk Controllers |
| FDC37C67X | ENHANCED SUPER I/O CONTROLLER WITH FAST IR |
| FDC37C957FR | ULTRA I/O CONTROLLER FOR PORTABLE APPLICATIONS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FDC37C651 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Floppy Disk Controller |
| FDC37C651QFP | 制造商:SMC 功能描述: 制造商:SMSC 功能描述: 制造商:SMC Corporation of America 功能描述:FDC37C651QFP |
| FDC37C652 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Floppy Disk Controller |
| FDC37C652QFP | 制造商:SMSC 功能描述: |
| FDC37C653QFP | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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