No. 6015-10/31

LC78622NE

• Two-byte commands (RWC set once: Sets up the digital attenuation and the general-purpose I/O ports)

• Command noise rejection

This command reduces the noise on the CQCK clock signal. While this is effective for noise pulses shorter than

signal that decelerates the disk. Commands from the control microprocessor select one of four modes; accelerate,

Note: CLV servo control commands can set the TOFF pin low only in CLV mode. That pin will be at the high level

at all other times. Control of the TOFF pin by microprocessor command is only valid in CLV mode.

MSB

LSB

Command

RES = low

1 1 1 0 1 1 1 1

COMMAND INPUT NOISE REDUCTION MODE

1 1 1 0 1 1 1 0

RESET NOISE EXCLUSION MODE

q

q

MSB

LSB

Command

RES = low

0 0 0 0 0 1 0 0

DISC MOTOR START (accelerate)

0 0 0 0 0 1 0 1

DISC MOTOR CLV (CLV)

0 0 0 0 0 1 1 0

DISC MOTOR BRAKE (decelerate)

0 0 0 0 0 1 1 1

DISC MOTOR STOP (stop)

q

q

Mode

Accelerate

High

Low

Decelerate

Low

High

CLV

Pulse output

Pulse output

Stop

Low

Low