LPC47U33X View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

MFG CO.

LPC47U33X

100 Pin Enhanced Super I/O for LPC Bus with Consumer Features and SMBus Controller

SMSC -> Microchip 

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Table 30 - Interrupt Identification

SE IC

INTERRUPT DUE TO

0

11 Polling

1

00 Normal termination of Seek

or Recalibrate command

Abnormal termination of

1

01 Seek or Recalibrate

command

The Seek, Relative Seek, and Recalibrate

commands have no result phase. The Sense

Interrupt Status command must be issued

immediately after these commands to terminate

them and to provide verification of the head

position (PCN). The H (Head Address) bit in

ST0 will always return a "0". If a Sense Interrupt

Status is not issued, the drive will continue to be

BUSY and may affect the operation of the next

command.

Sense Drive Status

Sense Drive Status obtains drive status

information. It has not execution phase and

goes directly to the result phase from the

command phase. Status Register 3 contains

the drive status information.

Specify

The Specify command sets the initial values for

each of the three internal times. The HUT

(Head Unload Time) defines the time from the

end of the execution phase of one of the

read/write commands to the head unload state.

The SRT (Step Rate Time) defines the time

interval between adjacent step pulses. Note that

the spacing between the first and second step

pulses may be shorter than the remaining step

pulses. The HLT (Head Load Time) defines the

time between when the Head Load signal goes

high and the read/write operation starts. The

values change with the data rate speed selection

and are documented in Table 30. The values

are the same for MFM and FM.

The choice of DMA or non-DMA operations is

made by the ND bit. When this bit is "1", the

non-DMA mode is selected, and when ND is "0",

the DMA mode is selected. In DMA mode, data

transfers are signaled by the DMA request cycle.

Non-DMA mode uses the RQM bit and the

interrupt to signal data transfers.

Configure

The Configure command is issued to select the

special features of the FDC. A Configure

command need not be issued if the default

values of the FDC meet the system

requirements.

66

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