10.8.21 Write Multiple EXT (39h)
COMMAND CODE | 0 0 1 1 1 0 0 1 |
| REGISTER | |||
|
|
| REGISTER SETTING | NORMAL COMPLETION | ||
DR |
|
| drive no. |
| no change | |
LBA | Current |
| LBA(7:0) | HOB=0 |
| last address |
|
| |||||
Low | Previous |
| LBA(31:24) | HOB=1 |
| last address |
LBA | Current |
| LBA(15:8) | HOB=0 |
| last address |
Mid | Previous |
| LBA(39:32) | HOB=1 |
| last address |
LBA | Current |
| LBA(23:16) | HOB=0 |
| last address |
High | Previous |
| LBA(47:40) | HOB=1 |
| last address |
SC | Current |
| sector count(7:0) | HOB=0 |
| 00H |
| Previous |
| sector count(15:8) | HOB=1 |
| 00H |
FT | Current |
| reserved | HOB=0 |
| no change |
| Previous |
| reserved | HOB=1 |
| no change |
This command is basically identical to Write Multiple command except register setting.
This command is available in LBA addressing only.
10.8.22 Set Multiple Mode (C6h)
COMMAND CODE | 1 1 0 0 0 1 1 0 | REGISTER | |
| REGISTER SETTING | NORMAL COMPLETION | |
DR | drive no. | no change | |
CY |
|
| no change |
HD |
|
| no change |
SN |
|
| no change |
SC | The number of sectors / block | no change | |
FT |
|
| no change |
This command enables the drive to perform Read and Write Multiple operations and sets the block count for these commands.
The Sector Count Register is loaded with the number of sectors per block. The drive supports 1,2,4,8 or16 sectors per block.
Upon receipt of the command, the drive sets BSY=1 and checks the content of Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded for all subsequent Read Multiple and Write Multiple commands. And these commands are enabled to be executed. If a block count is not supported , this command shall be terminated with the report of an Aborted Command error , and Read Multiple and Write Multiple commands are disabled.
If the Sector Count Register contains 0 when the command is issued, Read Multiple and Write Multiple commands are disabled.
In case of software reset, the result depends on the setting of Set Feature command. If FT=66h, the mode is not changed. If FT = CCh, the mode reverts to power on default (16 sectors).
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