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| 型號(hào)： | SIO10N268-NU |
| 廠商： | STANDARD MICROSYSTEMS CORP |
| 元件分類(lèi)： | 外設(shè)及接口 |
| 英文描述： | MULTIFUNCTION PERIPHERAL, PQFP128 |
| 封裝： | 14 X 14 MM, 1MM THICKNESS, GREEN, TQFP-128 |
| 文件頁(yè)數(shù)： | 229/251頁(yè) |
| 文件大小： | 1384K |
| 代理商： | SIO10N268-NU |
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Advanced Notebook I/O for ISA or LPC Designs
Datasheet
SMSC SIO10N268
Page 79
Rev. 0.5 (03-24-05)
DATASHEET
8.7.7
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.
8.7.7.1
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 sector address is 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 the TC cycle, 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.
N determines the number of bytes per sector (see Table 8.23 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 8.23 - Sector Sizes
N
SECTOR SIZE
00
01
02
03
..
07
128 bytes
256 bytes
512 bytes
1024 bytes
...
16 Kbytes
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.
If the host terminates a read or write operation in the FDC, the ID information in the result phase is
dependent upon the state of the MT bit and EOT byte. Refer to Table 8.24.
At the completion of the Read Data command, the head is not unloaded until after the Head Unload Time
Interval (specified in the Specify command) has elapsed. If the host issues another command before the
head unloads, then the head settling time may be saved between subsequent reads.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SIO665GT | 功能描述:界面開(kāi)發(fā)工具 Evaluation Board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V |
| SIO666GT | 功能描述:界面開(kāi)發(fā)工具 Evaluation Board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V |
| SIO669 | 功能描述:界面開(kāi)發(fā)工具 Evaluation Board RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V |
| SIOLS1000V2 | 制造商:SECELECTRONICS 制造商全稱(chēng):SECELECTRONICS 功能描述:Current Sensors |
| SIOLS2000V2 | 制造商:SECELECTRONICS 制造商全稱(chēng):SECELECTRONICS 功能描述:Current Sensors |
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