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4 Gb/s/pin 32 bit 512 Mb GDDR4 (Graphics Double Data Rate 4) SDRAM was implemented by using an 80 nm CMOS process. It employs a data bus inversion (DBI) coding to overcome the bottleneck of a parallel single-ended signaling, a power consumption of I/O, power supply noise, and crosstalk. Both DBI AC and DC modes are combined to a single circuit by eliminating the feedback path of a conventional DBI...
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