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參數資料
| 型號： | W83627HF-AW |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 外設及接口 |
| 英文描述： | WINBOND I/O |
| 中文描述： | MULTIFUNCTION PERIPHERAL, PQFP128 |
| 封裝： | PLASTIC, QFP-128 |
| 文件頁數： | 32/185頁 |
| 文件大小： | 1044K |
| 代理商： | W83627HF-AW |
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W83627HF/F
PRELIMINARY
Publication Release Date: Jul 1999
- 22 - Revision 0.53
At the start of a command the FIFO is always disabled and command parameters must be sent based
upon the RQM and DIO bit settings in the main status register. When the FDC enters the command
execution phase, it clears the FIFO of any data to ensure that invalid data are not transferred.
An overrun and underrun will terminate the current command and the data transfer. Disk writes will
complete the current sector by generating a 00 pattern and valid CRC. Reads require the host to
remove the remaining data so that the result phase may be entered.
DMA transfers are enabled with the SPECIFY command and are initiated by the FDC by activating the
DRQ pin during a data transfer command. The FIFO is enabled directly by asserting DACK# and
addresses need not be valid.
Note that if the DMA controller is programmed to function in verify mode a pseudo read is performed by
the FDC based only on DACK#. This mode is only available when the FDC has been configured into
byte mode (FIFO disabled) and is programmed to do a read. With the FIFO enabled the above
operation is performed by using the new VERIFY command. No DMA operation is needed.@
3.1.3
The function of the data separator is to lock onto the incoming serial read data. When a lock is achieved
the serial front end logic of the chip is provided with a clock which is synchronized to the read data. The
synchronized clock, called the Data Window, is used to internally sample the serial data portion of the
bit cell, and the alternate state samples the clock portion. Serial to parallel conversion logic separates
the read data into clock and data bytes.
The Digital Data Separator (DDS) has three parts: control logic, error adjustment, and speed tracking.
The DDS circuit cycles once every 12 clock cycles ideally. Any data pulse input will be synchronized and
then adjusted by immediate error adjustment. The control logic will generate RDD and RWD for every
pulse input. During any cycle where no data pulse is present, the DDS cycles are based on speed. A
digital integrator is used to keep track of the speed changes in the input data stream.
Data Separator
3.1.4
The write precompensation logic is used to minimize bit shifts in the RDDATA stream from the disk
drive. Shifting of bits is a known phenomenon in magnetic media and is dependent on the disk media
and the floppy drive.
The FDC monitors the bit stream that is being sent to the drive. The data patterns that require
precompensation are well known. Depending upon the pattern, the bit is shifted either early or late
relative to the surrounding bits.
Write Precompensation
3.1.5
The FDC is also capable of interfacing directly to perpendicular recording floppy drives. Perpendicular
recording differs from the traditional longitudinal method in that the magnetic bits are oriented vertically.
This scheme packs more data bits into the same area.
FDCs with perpendicular recording drives can read standard 3.5" floppy disks and can read and write
perpendicular media. Some manufacturers offer drives that can read and write standard and
perpendicular media in a perpendicular media drive.
Perpendicular Recording Mode
相關PDF資料 |
PDF描述 |
|---|---|
| W83627HF-PW | WINBOND I/O |
| W83627HF | WINBOND I/O |
| W83629D | A Condensed Centralizer IC For IRQ and DMA Control.(用于中斷請求和直接存儲器存儲控制的中心器) |
| W83628F | PCI TO ISA BRIDGE SET |
| W83637HF | LPC I/O |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W83627HF-PW | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
| W83627HG | 制造商:WINBOND 制造商全稱:Winbond 功能描述:Winbond LPC I/O |
| W83627HG-AW | 功能描述:IC LPC SUPER I/O 128-PQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標準包裝:3,000 系列:- 應用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應商設備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| W83627SF | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
| W83627SF_05 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:WINBOND I/O |
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