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參數(shù)資料
| 型號(hào)： | LPC47B34X |
| 廠(chǎng)商： | STANDARD MICROSYSTEMS CORP |
| 元件分類(lèi)： | 外設(shè)及接口 |
| 英文描述： | 128 Pin Enhanced Super I/O with LPC Interface for Consumer Applications |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP128 |
| 封裝： | QFP-128 |
| 文件頁(yè)數(shù)： | 60/250頁(yè) |
| 文件大小： | 645K |
| 代理商： | LPC47B34X |
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60
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 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 17 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 17 – Sector Sizes
N
00
01
02
03
…
07
SECTOR SIZE
128 bytes
256 bytes
512 bytes
1024 bytes
...
16 Kbytes
The amount of data that 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 19.
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