SanDisk CompactFlash 5000 Manual descargar pdf (Pagina 69)

SanDisk Industrial Grade CompactFlash 5000 Product Manual

5.1.18

Set Features–EFH

The host uses this command to establish or select certain features.

Table 61:

Set Features

Table 62 defines all supported features. The 9AH feature is unique to

CompactFlash Memory cards and is not part of the ATA Specification.

Table 62:

Features Supported

Feature Operation

01h Enable 8-bit data transfer

02h Enable Write Cache

03h Set Transfer Mode based on value and Sector Count register.

55h Disable Read Look Ahead

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

69h Accepted for backward compatibility with the SDP Series but has no

impact on the CF Memory Card.

81h Disable 8-bit data transfer

96h Accepted for backward compatibility with the SDP Series but has no

impact on the CF Memory Card

9Ah Accepted for backward compatibility with the SDP Series but has no

impact on the CF Memory Card

BBh 4 bytes of data apply on Read/Write Long commands

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

Features 01H and 81H are used to enable and disable 8-bit data transfer

mode. If the 01H feature command is issued, all data transfers will occur on

the low order D7-D0 data bus and the IOIS16 signal will not be asserted for

data register accesses.

A host can choose the transfer mechanism by Set Transfer Mode and

specifying a value in the Sector Count register. The upper 5 bits define the

type of transfer and the low order 3 bits encode the mode value.

Where “nnn” is a valid mode number in binary; “x” is the mode number in decimal for

the associated transfer type; and “d” is ignored.

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SanDisk CompactFlash 5000 Manual Pagina 69