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Figure 18 44-pin IDE Example
10.2.3 5-pin Compact Flash Header
CompactFlash (CF) cards with DMA capability require that the two signals IDE_REQ and IDE_ACK# are
routed to the CF card socket on the COM Express carrier board. If this is not done then some DMA
capable CF cards may not work because they are not designed for non-DMA mode. For more
information about this subject, refer to the data sheet of the CF card or contact your CF card
manufacturer.
CF socket pin 39 (CSEL#) is connected to a jumper to select master or slave configuration. If jumpered
low, the drive is configured for master mode. This provides the ability to perform a CompactFlash boot.
Page 56 of 103
COM Express Carrier Type 2
Design Guide
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