User guide

203 Series Industrial Grade 2.5" FlashDrive Product Manual v2.0Cactus Technologies

Table 5-30. Features Supported

Feature Operation

03H Set transfer mode.

55H Disable Read Look Ahead.

66H Disable Power on Reset (POR) establishment of defaults at Soft Reset.

69H NOP; accepted for backward compatibility.

81H Disable 8-bit data transfer.

96H NOP; accepted for backward compatibility.

97H NOP; accepted for backward compatibility.

BBH 4 bytes of data apply on Read/Write Long commands.

CCH Enable Power on Reset (POR) establishment of defaults at Soft Reset.

Features 03H is used by the host to set the desired transfer mode for PIO, MWDMA or UDMA

transfers.

Features 55H and BBH are the default features for the drive; thus, the host does not have to issue

this command with these features unless it is necessary for compatibility reasons.

Features 66H and CCH can be used to enable and disable whether the Power On Reset (POR)

Defaults will be set when a soft reset occurs. The default setting is to revert to the POR defaults

when a soft reset occurs. POR defaults the number of heads and sectors along with 16 bit data

transfers and the read/write multiple block count.

5.1.18. Set Multiple Mode-C6H

Table 5-31. Set Multiple Mode

Bit -> 7 6 5 4 3 2 1 0

Command (7)

C6H

C/D/H (6)

X Drive X

Cyl High (5)

Cyl Low (4)

Sec Num (3)

Sec Cnt (2)

Sector Count

Feature (1)

The Set Multiple Mode command in Table 5-31 enables the drive to perform Read and Write Multiple

operations and establishes the block count for these commands. The Sector Count Register is

loaded with the number of sectors per block. Upon receipt of the command, the FlashDrive sets BSY

to 1 and checks the 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 execution of those

commands is enabled. If a block count is not supported, an Aborted Command error is posted, and

Read Multiple and Write Multiple commands are disabled. If the Sector Count Register contains 0

when the command is issued, Read and Write Multiple commands are disabled. At power on, or

after a hardware or (unless disabled by a Set Feature command) software reset, the default mode is

Read and Write Multiple disabled.