Fujitsu MBC2036RC, MBC2073RC, MBA3300RC Mode = 0, 0, 1, 0 Data only, with address specification

Command Specifications

(3) Mode = 0, 0, 1, 0: Data only, with address specification

In this mode, data transfer from the INIT includes buffer data only without the 4- byte header being added.

The top address of the data buffer where the data transferred from the INIT are to be stored can be specified in the "Buffer address" field.

The "Transfer byte length" field in the CDB specifies the total number of bytes of data transferred by the INIT. The HDD stores data transferred from the INIT in the data buffer beginning at the byte position specified in the "Buffer address" field in the CDB.

Furthermore, a value less than the ["HDD's buffer size" – value specified in the "Buffer address" field] must be specified in the "Transfer byte length" field in the CDB. When a value larger than that is specified, data transfer is not executed with the INIT. Also, when zero is specified in the "Transfer byte length" field, this command is terminated without data transfer being executed.

(4) Mode = 0, 1, 0, 0: Microcode download, without saving

In this mode, the controller's microcode or control information is transferred to the HDD's control memory area. "0" must be specified in the "Buffer ID" field and the "Buffer address" field.

The "Transfer byte length" field specifies the total number of transfer bytes of data transferred from the INIT.

When downloading of microcode is completed, the HDD generates a UNIT ATTENTION condition for all the INITs. At this time, the HDD performs microprogram reboot and generates sense data.

The HDD operates according to this microcode until its power is switched off. If the power is switched on again, the HDD's operation returns to the existing microcode saved previously on the disk.

(5) Mode = 0, 1, 0, 1 : Microcode download, with saving

In this mode, the controller's microcode or control information is transferred to the HDD's control memory area and written to the disk. "0" must be specified in the "Buffer ID" field and the "Buffer address" field.

The "Transfer byte length" field specifies the total number of transfer bytes of data transferred from the INIT.

When all the data have been received, the HDD writes the new microcode to the disk's system area and operates in accordance with the old microcode until new microcode is downloaded.

266 C141-C013