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

零件编号

产品描述 (功能)

生产厂家

FDC37C932APM

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

SMSC -> Microchip 

SYMBOL

EOT

GAP

GPL

H/HDS

HLT

HUT

LOCK

MFM

MT

Table 19 - Description of Command Symbols

NAME

DESCRIPTION

End of Track

The final sector number of the current track.

Alters Gap 2 length when using Perpendicular Mode.

Gap Length

The Gap 3 size. (Gap 3 is the space between sectors excluding

the VCO synchronization field).

Head Address

Selected head: 0 or 1 (disk side 0 or 1) as encoded in the sector

ID field.

Head Load Time The time interval that FDC waits after loading the head and before

initializing a read or write operation. Refer to the Specify

command for actual delays.

Head Unload

Time

The time interval from the end of the execution phase (of a read or

write command) until the head is unloaded. Refer to the Specify

command for actual delays.

Lock defines whether EFIFO, FIFOTHR and PRETRK parameters

of the CONFIGURE COMMAND can be reset to their default

values by a "Software Reset" (reset caused by writing to the

appropriate bits of either tha DSR or DOR).

MFM/FM Mode

Selector

A “1” selects the double density (MFM) mode. A “0” selects single

density (FM) mode.

Multi-Track

Selector

When set, this flag selects the multi-track operating mode. In this

mode, the FDC treats a complete cylinder under head 0 and 1 as

a single track. The FDC operates as this expanded track started

at the first sector under head 0 and ended at the last sector under

head 1. With this flag set, a multitrack read or write operation will

automatically continue to the first sector under head 1 when the

FDC finishes operating on the last sector under head 0.

41

Share Link: