Specifications

ATAPI For Streaming Tape QIC-157 Rev B

be set in this field by the Device to indicate which Advanced PIO Modes that it is capable of

supporting. Of these bits, bits 7 through 1 are reserved for future advanced PIO modes. Bit 0, if set,

indicates that the Device supports PIO Mode 3.

4.1.7.14. Minimum Multi-word DMA Transfer Cycle Time per Word (Word

65)

Word 65 of the parameter information of the IDENTIFY DEVICE command is defined as the

Minimum Multi-word DMA Transfer Cycle Time Per Word. This field defines, in nanoseconds, the

minimum cycle time that the Device can support when performing Multi-word DMA transfers on a

per word basis.

Any Device that supports Multi-word DMA Mode 1 or above shall support this field, and the value

in word 65 shall not be less than 150.

If the Device does not support this field, the Device shall return a value of zero in this field.

4.1.7.15. Manufacturer’s Recommended Multi-word DMA Transfer Cycle

Time (Word 66)

Word 66 of the parameter information of the IDENTIFY DEVICE command is defined as the

Manufacturer’s Recommended Multi-word DMA Transfer Cycle Time. This field defines, in

nanoseconds, the minimum cycle time per word during a single sector Host transfer while

performing a multiple sector READ DMA or WRITE DMA commands over all locations on the

media under nominal conditions. A cycle time less than this value may cause DMARQ to be

deasserted at a rate that may reduce throughput without data corruption.

Any Device that supports Multi-word DMA Mode 1 or above shall support this field, and the value

in word 66 shall not be less than the value in word 65.

If the Device does not support this field, the Device shall return a value of zero in this field.

4.1.7.16. Minimum PIO Transfer Cycle Time Without Flow Control (Word

67)

Word 67 of the parameter information of the IDENTIFY DEVICE command is defined as the

Minimum PIO Transfer Without Flow Control Cycle Time. This field defines, in nanoseconds, the

minimum cycle time that, if used by the Host, the Device guarantees data integrity during the

transfer without utilization of flow control.

Any Device that supports PIO Mode 3 or above shall support this field, and the value in word 67

shall not be less than 180.

If the Device does not support this field, the Device shall return a value of zero in this field.

4.1.7.17. Minimum PIO Transfer Cycle Time with IORDY Flow Control

(Word 68)

Word 68 of the parameter information of the IDENTIFY DEVICE command is defined as the

Minimum PIO Transfer With IORDY Flow Control Cycle Time. This field defines, in nanoseconds,

the minimum cycle time that the Device can support while performing data transfers while utilizing

IORDY flow control.