• main() : sdram_test.c , sdram_usart_test.c
• mt481c2m32b2tg_init() : mt481c2m32b2tg.h , mt48lc2m32b2tg.h , mt481c2m32b2tg.c
• sdram_delay() : sdram.c
• sdramc_init() : sdram.h , sdram.c

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