6.1 Device Response to the Reset. Fujitsu C141-E090-02EN

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6.1 Device Response to the Reset. Fujitsu C141-E090-02EN | Manualzz

CHAPTER 6 OPERATIONS

6.1

Device Response to the Reset

6.2

Address Translation

6.3

Power Save

6.4

Defect Management

6.5

Read-Ahead Cache

6.6

Write Cache

6.1

Device Response to the Reset

This section describes how the PDIAG- and DASP- signals responds when the power of the

IDD is turned on or the IDD receives a reset or diagnostic command.

C141-E090-01EN 6 - 1

6.1.1

Response to power-on

After the master device (device 0) releases its own power-on reset state, the master device shall check a DASP- signal for up to 450 ms to confirm presence of a slave device (device 1).

The master device recognizes presence of the slave device when it confirms assertion of the

DASP- signal. Then, the master device checks a PDIAG- signal to see if the slave device has successfully completed the power-on diagnostics.

If the master device cannot confirm assertion of the DASP- signal within 450 ms, the master device recognizes that no slave device is connected.

After the slave device (device 1) releases its own power-on reset state, the slave device shall report its presence and the result of power-on diagnostics to the master device as described below:

DASP- signal: Asserted within 400 ms, and negated after the first command is received from the host or within 31 seconds or after executing software reset, which ever comes first.

PDIAG- signal: Negated within 1 ms and asserted within 30 seconds, then negated within 31 seconds.

Power on

Master device

Power On Reset-

Status Reg.

BSY bit

Max. 31 sec.

Checks DASP- for up to

450 ms.

If presence of a slave device is confirmed, PDIAG- is checked for up to 31 seconds.

Slave device

Power On Reset-

BSY bit

PDIAG-

DASP-

Max. 1 ms.

Max. 30 sec.

Max. 400 ms.

Max. 31 sec.

Figure 6.1

Response to power-on

6 - 2 C141-E090-01EN

.

6.1.2

Response to hardware reset

Response to RESET- (hardware reset through the interface) is similar to the power-on reset.

Upon receipt of hardware reset, the master device checks a DASP- signal for up to 450 ms to confirm presence of a slave device. The master device recognizes the presence of the slave device when it confirms assertion of the DASP- signal. Then the master device checks a

PDIAG- signal to see if the slave device has successfully completed the self-diagnostics.

If the master device cannot confirm assertion of the DASP- signal within 450 ms, the master device recognizes that no slave device is connected.

After the slave device receives the hardware reset, the slave device shall report its presence and the result of the self-diagnostics to the master device as described below:

DASP- signal: Asserted within 400 ms, and negated after the first command is received from the host or within 31 seconds or after executing software reset, which ever comes first.

PDIAG- signal: Negated within 1 ms and asserted within 30 seconds, then negated within 31 seconds

Reset-

Master device

Status Reg.

BSY bit

Checks DASP- for up to

450 ms.

Max. 31 sec.

If presence of a slave device is confirmed, PDIAG- is checked for up to 31 seconds.

Slave device

BSY bit

PDIAG-

DASP-

Max. 1 ms.

Max. 30 sec.

Max. 400 ms.

Max. 31 sec.

Figure 6.2

Response to hardware reset

C141-E090-01EN 6 - 3

6.1.3

Response to software reset

The master device does not check the DASP- signal for a software reset. If a slave device is present, the master device checks the PDIAG- signal for up to 31 seconds to see if the slave device has completed the self-diagnosis successfully.

After the slave device receives the software reset, the slave device shall report its presence and the result of the self-diagnostics to the master device as described below:

PDIAG- signal: negated within 1 ms and asserted within 30 seconds then negated within 31 seconds.

When the IDD is set to a slave device, the IDD asserts the DASP- signal when negating the

PDIAG- signal, and negates the DASP- signal when asserting the PDIAG- signal.

X'3F6' Reg.

Master device

Status Reg.

BSY bit

X"0C" or X"04"

X"00"

Max. 31 sec.

If the slave device is preset, DASP- is checked for up to

31 seconds.

Slave device

BSY bit

PDIAG-

DASP-

Max. 1 ms.

Max. 30 sec.

Figure 6.3

Response to software reset

6 - 4 C141-E090-01EN

6.1.4

Response to diagnostic command

When the master device receives an EXECUTE DEVICE DIAGNOSTIC command and the slave device is present, the master device checks the PDIAG- signal for up to 6 seconds to see if the slave device has completed the self-diagnosis successfully.

The master device does not check the DASP- signal.

After the slave device receives the EXECUTE DEVICE DIAGNOSTIC command, it shall report the result of the self-diagnostics to the master device as described below:

PDIAG- signal: negated within 1 ms and asserted within 5 seconds then negated within 6 seconds.

When the IDD is set to a slave device, the IDD asserts the DASP- signal when negating the

PDIAG- signal, and negates the DASP- signal when asserting the PDIAG- signal.

X'1F7' Reg.

Write

Master device

Status Reg.

BSY bit

Max. 6 sec.

If the slave device is preset, DASP- signal is checked for up to

6 seconds.

Slave device

BSY bit

PDIAG-

DASP-

Max. 1 ms.

Max. 5 sec.

Figure 6.4

Response to diagnostic command

C141-E090-01EN 6 - 5

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