FUJITSU MCJ3230AP - Manual (Page 106)

Host Interface
4-34 C156-E205-01EN
4.5.9 PACKET (A0h)
Table 4.30 PACKET command
Bit
7 6 5 4 3 2 1 0
CM 1 0 1 0 0 0 0 0
DH X X X DEV X X X X
CH Byte Count Limit (15-8)
CL Byte Count Limit (7-0)
SN X X X X X X X X
SC X X X X X X X X
FR X X X X X X X X
The PACKET command issues the ATAPI packet command.
For the Byte Count Limit, specify the maximum number of bytes transferred per
INTRQ in PIO mode.
When the value of the Byte Count Limit is smaller than 2048, the data is
transferred in 2048-byte units.
The execution protocol of the ATAPI packet command conforms to the AT
Attachment with Packet Interface - 5 (ATA/ATAPI-5) of the ANSI documents.