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PRELIMINARY
S3C6400X RISC MICROPROCESSOR
MODEM INTERFACE
23-5
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.
NFCON
External
Modem
Modem I/F
Indirect Modem I/F
Direct Modem I/F
SYSCON
Stepping Stone
M
S
S
GPIO
8KByte
DPRAM
S
M
Boot Memory
ARM
WDT
(1)
(2)
(3)
(1) AP write boot pgm to DPRAM (read from NAND)
(2) AP release BB reset
(3) BB read boot pgrm from Direct modem I/F
Figure 23-3 AP Booting for MODEM boot procedure
Note 1) Reset pin of the MODEM is controlled the GPIO pin of the AP. The pin must be in pull-down mode when
the initial power-on-reset state.
Note 2) the boot address Chip Select pin of the MODEM should be connected “XhiCSn”.