Product manual

SanDisk Industrial Grade CompactFlash 5000 Product Manual

ATA Command Description

This section defines the software requirements and the format of commands

the host sends to CompactFlash Memory cards. Commands are issued to the

card by loading the required registers in the command block with the supplied

parameters, and then writing the command code to the Command Register.

The manner in which a command is accepted varies. There are three classes

(see Table 31: Primary and Secondary I/O Decoding) of command acceptance,

all dependent upon the host only issuing commands when the card is not

busy. (The BUSY bit in the status and alternate status registers is 0.)

Upon receipt of a Class 1 command, the card sets the BUSY bit within 400

nsec.

Upon receipt of a Class 2 command, the card sets the BUSY bit within 400

nsec, sets up the sector buffer for a write operation, sets DRQ within 700

µsec, and clears the BUSY bit within 400 nsec of setting DRQ.

Upon receipt of a Class 3 command, the card sets the BUSY bit within 400

nsec, sets up the sector buffer for a write operation, sets DRQ within 20 msec

(assuming no re-assignments), and clears the BUSY bit within 400 nsec of

setting DRQ.

5.1 ATA Command Set

Table36 summarizes the ATA command set with the paragraphs that follow

describing the individual commands and the task file for each.

Table36: Primary and Secondary I/O Decoding

Class Command Code FR SC SN CY DH LBA

1 Check Power Mode E5h or 98h - - - - D -

1 Execute Drive Diagnostic 90h - - - - D -

1 Erase Sector(s) a C0h - Y Y Y Y Y

2 Format Track 50h - Y - Y Y Y

1 Identify Device ECh - - - - D -

1 Idle E3h or 97h - Y - - D -

1 Idle Immediate E1h or 95h - - - - D -

1 Initialize Drive Parameters 91h - Y - - Y -

1 Read Buffer E4h - - - - D -

1 Read DMA C8 or C9 - Y Y Y Y Y

1 Read Multiple C4h - Y Y Y Y Y

1 Read Long Sector 22h or 23h - - Y Y Y Y

1 Read Sector(s) 20h or 21h - Y Y Y Y Y

1 Read Verify Sector(s) 40h or 41h - Y Y Y Y Y

1 Recalibrate 1Xh - - - - D -

1 Request Sense b 03h - - - - D -

1 Seek 7Xh - - Y Y Y Y

1 Set Features EFh Y - - - D -

1 Set Multiple Mode C6h - Y - - D -

1 Set Sleep Mode E6h or 99h - - - - D -