Fujitsu MPB3054AT At command issuance I/O registers setting contents, 1F7 HCM, 1F6 HDH, 1F5 HCH

Models: MPB3043AT MPB3021AT MPB3052AT MPB3032AT MPB3054AT

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(20)READ BUFFER (X'E4')

At command issuance (I/O registers setting contents)

1F7H(CM)

 

0

0

1

 

1

0

0

1

R

 

 

 

 

 

 

 

 

 

 

1F6H(DH)

 

×

L

 

×

 

DV

 

Head No. /LBA [MSB]

 

 

 

 

 

 

 

 

 

 

 

1F5H(CH)

 

 

 

Cylinder No. [MSB]

/ LBA

 

 

1F4H(CL)

 

 

 

Cylinder No. [LSB] / LBA

 

 

1F3H(SN)

 

 

 

Sector No.

 

 

/ LBA [LSB]

 

 

1F2H(SC)

 

 

 

Number of sectors to be transferred

 

1F1H(FR)

 

 

 

 

 

 

 

xx

 

 

 

R = 0

→with Retry

 

 

 

 

 

 

 

 

 

 

 

R = 1

→without Retry

 

 

 

 

 

 

 

 

 

 

At command completion (I/O registers contents to be read)

1F7H(ST)

 

 

 

Status information

 

 

 

 

 

 

 

 

1F6H(DH)

×

L

 

×

 

DV

Head No. /LBA [MSB]

 

 

 

 

 

 

 

1F5H(CH)

 

 

Cylinder No. [MSB] / LBA

1F4H(CL)

 

 

Cylinder No. [LSB] / LBA

1F3H(SN)

 

 

Sector No.

 

/ LBA [LSB]

1F2H(SC)

 

 

 

 

 

00 (*1)

1F1H(ER)

 

 

 

Error information

*1 If the command is terminated due to an error, this register indicates 01.

(20)READ BUFFER (X'E4')

The host system can read the current contents of the sector buffer of the device by issuing this command. Upon receipt of this command, the device sets the BSY bit of Status register and sets up the sector buffer for a read operation. Then the device sets the DRQ bit of Status register, clears the BSY bit, and generates an interrupt. After that, the host system can read up to 512 bytes of data from the buffer.

At command issuance (I/O registers setting contents)

1F7H(CM)

1

1

1

1

0

1

0

0

 

 

 

 

 

 

 

 

 

 

1F6H(DH)

×

×

×

DV

 

 

 

xx

 

 

 

 

 

 

 

 

 

 

 

1F5H(CH)

 

 

 

 

xx

 

 

 

1F4H(CL)

 

 

 

 

xx

 

 

 

1F3H(SN)

 

 

 

 

xx

 

 

 

1F2H(SC)

 

 

 

 

xx

 

 

 

1F1H(FR)

 

 

 

 

xx

 

 

 

 

 

 

 

 

 

 

 

 

 

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C141-E045-02EN

Page 105
Image 105
Fujitsu MPB3054AT At command issuance I/O registers setting contents, 1F7 HCM, 1F6 HDH, Head No. /LBA MSB, 1F5 HCH, 00 *1