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PRELIMINARY
S3C6400X RISC MICROPROCESSOR
CF CONTROLLER
9-11
Preliminary product information describe products that are in development,
for which full characterization data and associated errata are not yet available.
Specifications and information herein are subject to change without notice.
UDMA Mode
Direct mode and Indirect mode
Host can control device through EBI in indirect mode. If the IO voltage of external memory is not 3.3V,
level shifter is required for data bus. Level shifter requires a direction control bit for data bus. Two pins,
XhiIRQn or XirSDBW, can be selected for a direction control bit. (These two pins are used as a control bit
not only in UDMA mode but also in PC-CARD mode and PIO mode.) CF card or micro-drive can be
connected directly to S3C6400 in direct mode without any extra work.
UDMA-In Transfer (termination by device)
CS0,CS1,
DA[2:0]
RD
DD[15:0 ] or
DD[7:0]
DMACK
DMARQ
DIOW
DIOR
IORDY
tACKENV
tACKENV
tDVS
tACKENV
tDVH
tACKENV
CRC
Figure 5-6: UDMA - In operation (terminated by device)
UDMA-In Transfer (termination by host)
CS0,CS1,
DA[2:0]
RD
DD[15:0 ] or
DD[7:0]
DMACK
DMARQ
DIOW
DIOR
IORDY
tRP
tACKENV
tACKENV
tDVS
tDVH
Figure 9-7: UDMA - In Operation (terminated by host)