Fujitsu MHR2030AT User Manual download pdf (Page 87)

5.2 Logical Interface

C141-E145-02EN 5-13

- Bit 1: Always 0.

- Bit 0: Error (ERR) bit. This bit indicates that an error was detected while the

previous command was being executed. The Error register indicates

the additional information of the cause for the error.

(10) Command register (X’1F7’)

The Command register contains a command code being sent to the device. After

this register is written, the command execution starts immediately.

Table 5.3 lists the executable commands and their command codes. This table

also lists the necessary parameters for each command which are written to certain

registers before the Command register is written.

5.2.3 Control block registers

(1) Alternate Status register (X’3F6’)

The Alternate Status register contains the same information as the Status register

of the command block register.

The only difference from the Status register is that a read of this register does not

imply Interrupt Acknowledge and INTRQ signal is not reset.

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

BSY DRDY DF DSC DRQ 0 0 ERR

1 2 ... 82 83 84 85 86 87 88 89 90 91 92 ... 249 250

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Fujitsu MHR2030AT User Manual Page 87