FDC37M607 datasheet(64/182 Pages) SMSC

64 / 182 page

and is not needed for normal operation. Once

the Perpendicular Mode command is invoked,

FDC software behavior from the user standpoint

is unchanged.

The perpendicular mode command is enhanced

allow

specific

drives

designated

Perpendicular

recording

drives.

This

enhancement allows data transfers between

Conventional and Perpendicular drives without

having to issue Perpendicular mode commnds

between the accesses of the different drive

types,

nor

having

change

write

pre-

compensation values.

When both GAP and WGATE bits of the

PERPENDICULAR MODE COMMAND are both

programmed to "0" (Conventional mode), then

D0, D1, D2, D3, and D4 can be programmed

independently to "1" for that drive to be set

automatically to Perpendicular mode.

In this

mode the following set of conditions also apply:

1. The GAP2 written to a perpendicular drive

during a write operation will depend upon the

programmed data rate.

2. The write pre-compensation given to a

perpendicular mode drive will be 0ns.

3. For

D0-D3

programmed

"0"

for

conventional mode drives any data written

will be at the currently programmed write

pre-compensation.

Note: Bits D0-D3 can only be overwritten when

OW is programmed as a "1".If either

GAP or WGATE is a "1" then D0-D3 are

ignored.

Software

and

hardware

resets

have

the

following

effect

the

PERPENDICULAR

MODE COMMAND:

1. "Software" resets (via the DOR or DSR

registers) will only clear GAP and WGATE

bits to "0". D0-D3 are unaffected and retain

their previous value.

2. "Hardware"

resets

will

clear

all bits

(GAP, WGATE and D0-D3) to "0", i.e all

conventional mode.

FDC37M607 Datasheet(PDF) 64 Page - SMSC Corporation

FDC37M607 Datasheet(HTML) 64 Page - SMSC Corporation

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