Cactus Technologies, Limited
Conflicts may occur on the host data bus when this bit is provided by a Floppy Disk Controller
operating at the same addresses as the SSD. Following are some possible solutions to
this problem:
1. Locate the SSD at a non-conflicting address (i.e., Secondary address (377) when a Floppy
Disk Controller is located at the Primary addresses).
2. Do not install a Floppy and a SSD in the system at the same time.
3. Implement a socket adapter that can be programmed to (conditionally) tri-state D7 of I/0
address 3F7/377 when a SSD product is installed and conversely to tri-state D6-D0 of
I/O address 3F7/377 when a floppy controller is installed.
4. Do not use the SSD’s Drive Address register. This may be accomplished by either a) If
possible, program the host adapter to enable only I/O addresses 1F0-1F7, 3F6 (or 170-
177, 176) to the SSD or b) if provided use an additional Primary/Secondary
configuration in the SSD that does not respond to accesses to I/O locations 3F7 and
377. With either of these implementations, the host software must not attempt to use
information in the Drive Address Register.
Bit 6 (-WTG)
This bit is 0 when a write operation is in progress, otherwise, it is 1.
Bit 5 (-HS3)
This bit is the negation of bit 3 in the Drive/Head register.
Bit 4 (-HS2)
This bit is the negation of bit 2 in the Drive/Head register.
Bit 3 (-HS1)
This bit is the negation of bit 1 in the Drive/Head register.
Bit 2 (-HS0)
This bit is the negation of bit 0 in the Drive/Head register.
Bit 1 (-nDS1)
This bit is 0 when drive 1 is active and selected.
Bit 0 (-nDS0)
This bit is 0 when the drive 0 is active and selected.
6.ATA Command Description
This section defines the ATA command set supported by Cactus Technologies
®
mSATA SSDs.
6.1. ATA Command Set
Table 5-6 summarizes the supported ATA command set .
Table 5-6. ATA Command Set
COMMAND
Code
Check Power Mode
E5h, 98h
Data Set Management
06h
Execute Drive Diagnostic
90h
Flush Cache
E7h
Flush Cache Ext
EAh
Identify Drive
ECh
Idle
E3h, 97h
Idle Immediate
E1h, 95h
Initialize Drive Parameters
91h
NOP
00h
Read Buffer
E4h
Read DMA
C8h
Read DMA Ext
25h
Read FPDMA Queued
60h
Read Multiple
C4h
Read Multiple Ext
29h
Read Sector(s)
20h, 21h
Read Sector(s) Ext
24h
Cactus Technologies Limited
OEM Grade -245S Series mSATA SSD Product Manual
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