256M LVTTL interface SDRAM 100 MHz 1-Mword x 64-bit x 4-bank/2-Mword x 32-bit x 4-bank PC/100 SDRAM256M LVTTL接口SDRAM 100 MHz的1 - Mword ×64位×4行/ 2 - Mword ×32位×4银行PC / 100 SDRAM