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AT2LP response to the 13 cases given in the mass storage spec in case of interfacing with an IDE controller | Cypress Semiconductor

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AT2LP response to the 13 cases given in the mass storage spec in case of interfacing with an IDE controller

Last Updated: April 03, 2011
Question: 

How does the AT2LP react to the 13 cases given in the mass storage spec in case it is interfaced with an IDE controller?

Answer: 

The AT2LP follows the mass storage spec. The response of AT2LP, when interfaced with an IDE controller, to the 13 cases given in the mass storage spec, can be seen by going through the firmware of CY4611 FX2 to ATA reference design. The phase error is passed as a parameter to the function that returns the CSW packet only when the sector count mentioned in the READ/WRITE command contradicts with the data transfer length mentioned in the command header.

Find below the table that sums up AT2LP’s response to the 13 Cases in case it is interfaced with an IDE device. In case there is a difference in expectation between the host and drive, the endpoint is stalled, and the status byte depends on whether the drive detects an error or not.

Case

bCSWStatus

Endpoint 2/6 Status

Hn = Dn

0x00 or 0x01

Normal Operation

Hn < Di

0x00 or 0x01

EP6 Stalled

Hn < Do

0x00 or 0x01

EP6 Stalled

Hi > Dn

0x00 or 0x01

EP6 Stalled

Hi > Di

0x00 or 0x01

EP6 Stalled

Hi = Di

0x00 or 0x01

Normal Operation

Hi < Di

0x02

PHASE ERROR RESPONSE

Hi <> Do

0x00 or 0x01

EP6 Stalled

Ho > Dn

0x00 or 0x01

EP2 Stalled

Ho <> Di

0x00 or 0x01

EP2 Stalled

Ho > Do

0x00 or 0x01

EP2 Stalled

Ho = Do

0x00 or 0x01

Normal Operation

Ho < Do

0x02

PHASE ERROR RESPONSE

 

 

 

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