SLFLD25-256MM1UI STEC, SLFLD25-256MM1UI Datasheet - Page 17

• Manufacturer Part Number: SLFLD25-256MM1UI
• Manufacturer: STEC
• Type: Flash Diskr

Specifications of SLFLD25-256MM1UI

• Density: 256MByte
• Operating Supply Voltage (typ): 5V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Package Type: Not Required
• Mounting: Screw
• Pin Count: 44
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Programmable: Yes
• Lead Free Status / RoHS Status: Compliant

SLFLD25-xxx(M/G)M1U(I)
Datasheet
5.0 Registers
This chapter lists the registers of the IDE Flash Drive. Refer to ATA/IDE standards for further details,
including Task File Register mapping and bit definitions of each Task File Register.
The Data Register is accessed in word (16-bit) mode at power up. The IDE Flash Drive permits 8-bit
accesses if the host issues a Set Feature Command to put the IDE Flash Drive in 8-bit mode.
Data Register
Error Register
Sector Count Register
Sector Number Register
Cylinder Low Register
Cylinder High Register
Drive/Head Register
Status Register
Alternate Status Register
Device Control Register
Drive Address Register
Command Register
Task File Register
Table 14: IDE Flash Drive Task File Registers
The Data Register is a 16-bit read/write register used for transferring data
between the IDE Flash Drive and the host. This register can be accessed in word
mode and byte mode.
The Error Register is a read-only register that is used for analyzing an error. This
register is valid when the BSY bit in the Status register and Alternate Status
register are set to ―0‖ (Ready). Diagnostic Codes are returned in the Error
Register after a Execute Drive Diagnostic command (code 90h). Extended Error
Codes returned in the Error Register after a Request Sense command (code
03h).
This register contains the numbers of sectors of data requested to be transferred
on a read or write operation between the host and the IDE Flash Drive. If the
value in the register is 0, a count of 256 sectors is indicated.
When the LBA bit in the Drive/Head register is 0, this register contains the
starting sector number for any media access. When the LBA bit is set to 1, this
register contains bits 7:0 of the LBA for any media access.
In CHS mode (LBA=0), this register contains the low-order bits of the starting
cylinder address. In LBA mode, it contains bits 15:8 of the LBA.
In CHS mode (LBA=0), this register contains the high-order bits of the starting
cylinder address. In LBA mode, it contains bits 23:16 of the LBA.
This register selects the IDE Flash Drive address translation (CHS or LBA) and
provides head address (CHS) or high-order address bits 27:24 for LBA.
This read-only register indicates status of a command execution. When the BSY
bit is ―0‖, the other bits are valid; when the BSY bit is ―1‖, the other bits are not
valid. When the register is read, the interrupt pin, is cleared.
This register is the same as the Status register, except that is not negated when
the register is read.
This write-only register is used for controlling the interrupt request and issuing an
ATA soft reset to the IDE Flash Drive.
This read-only register is used for confirming the IDE Flash Drive’s status. This
register is provided for compatibility with the AT disk drive interface and it is not
recommended that this register be mapped into the host’s I/O space because of
potential conflicts on bit 7.
This write-only register is used for writing the command that executes the IDE
Flash Drive’s operation. The command code is written in the command register
after its parameters are written in the Task File during the IDE Flash Drive ready
state.
61000-04502-115, July 2008
Description
IDE Flash Drive
17