FDC37C932APM 查看數據表（PDF） - SMSC -> Microchip

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FDC37C932APM

Plug and Play Compatible Ultra I/O™ Controller with Soft Power Management

SMSC -> Microchip 

SYMBOL

N

Table 19 - Description of Command Symbols

NAME

DESCRIPTION

Sector Size Code

This specifies the number of bytes in a sector. If this parameter is

"00", then the sector size is 128 bytes. The number of bytes

transferred is determined by the DTL parameter. Otherwise the

sector size is (2 raised to the "N'th" power) times 128. All values

up to "07" hex are allowable. "07"h would equal a sector size of

16k. It is the user's responsibility to not select combinations that

are not possible with the drive.

NCN

ND

OW

PCN

POLL

PRETRK

R

RCN

N

SECTOR SIZE

00

128 bytes

01

256 bytes

02

512 bytes

03

1024 bytes

New Cylinder

Number

The desired cylinder number.

Non-DMA Mode

Flag

When set to “1”, indicates that the FDC is to operate in the non-

DMA mode. In this mode, the host is interrupted for each data

transfer. When set to “0”, the FDC operates in DMA mode,

interfacing to a DMA controller by means of the DRQ and nDACK

signals.

Overwrite

The bits D0-D3 of the Perpendicular Mode Command can only be

modified if OW is set to “1”. OW is defined in the Lock command.

Present Cylinder The current position of the head at the completion of Sense

Number

Interrupt Status command.

Polling Disable

When set, the internal polling routine is disabled. When clear,

polling is enabled.

Precompensation Programmable from track 00 to FFH.

Start Track

Number

Sector Address

The sector number to be read or written. In multi-sector transfers,

this parameter specifies the sector number of the first sector to be

read or written.

Relative Cylinder Relative cylinder offset from present cylinder as used by the

Number

Relative Seek command.

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