SST48CF024 datasheet(57/60 Pages) SST

57 / 60 page

Data Sheet

CompactFlash Card

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S71125-03-000

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4.0 APPENDIX

4.1 Differences between CF-ATA and PC Card-ATA/True IDE

This section details differences between CF-ATA vs. PC Card ATA and the differences between CF-ATA vs. True IDE.

4.1.1 Electrical Differences

4.1.1.1 TTL Compatibility

CF is not TTL compatible, it is a purely CMOS interface. Refer to section 2.3.2 of this specification.

4.1.1.2 Pull Up Resistor Input Leakage Current

The minimum pull up resistor input leakage current is 50K ohms rather than the 10K ohms stated in the PCMCIA

specification.

4.1.2 Functional Differences

4.1.2.1 Additional Set Features Codes in CF-ATA

The following Set Features codes are not PC Card ATA or True IDE, but provide additional functionality in CF-ATA.

•

69H, Accepted for backward compatibility

•

96H, Accepted for backward compatibility

•

97H, Accepted for backward compatibility

•

9AH, Set the host current source capability

4.1.2.2 Additional Commands in CF-ATA

The following commands are not standard PC Card ATA commands, but provide additional functionality in CF-ATA.

The command codes for the commands below are defined as vendor unique in PC Card ATA/True IDE.

•

C0H, Erase Sectors

•

87H, Translate Sector

•

F5H, Wear Level

The command codes for the commands below are defined as reserved in PC Card ATA/True IDE:

•

03H, Request Sense

•

38H, Write Without Erase

•

CDH, Write Multiple Without Erase

4.1.2.3 Idle Timer

The Idle timer uses an incremental value of 5 ms, rather than the 5 sec minimum increment value specified in PC

Card ATA/True IDE.

4.1.2.4 Recovery from Sleep Mode

For CF devices, recovery from sleep mode is accomplished by simply issuing another command to the device. A

hardware or software reset is not required.

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