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Rambus's RDRAM saw use in two video game consoles, beginning in 1996 with the Nintendo 64. The Nintendo console used 4 MB RDRAM running with a 500 MHz clock on a 9-bit bus, providing 500 MB/s bandwidth. RDRAM allowed N64 to be equipped with a large amount of memory bandwidth while maintaining a lower cost due to design simplicity.
Normal operations resume on the rising edge of the clock after the one where CKE is sampled high. Put another way, all other chip operations are timed relative to the rising edge of a masked clock. The masked clock is the logical AND of the input clock and the state of the CKE signal during the previous rising edge of the input clock. CS chip ...
These numbers represent t CL-t RCD-t RP-t RAS in multiples of the DRAM clock cycle time. Note that this is half of the data transfer rate when double data rate signaling is used. JEDEC standard PC3200 timing is 3-4-4-8 [38] with a 200 MHz clock, while premium-priced high performance PC3200 DDR DRAM DIMM might be operated at 2-2-2-5 timing. [39]
An XDR RAM chip's high-speed signals are a differential clock input (clock from master, CFM/CFMN), a 12-bit single-ended request/command bus (RQ11..0), and a bidirectional differential data bus up to 16 bits wide (DQ15..0/DQN15..0). The request bus may be connected to several memory chips in parallel, but the data bus is point to point; only ...
The earliest DRAMs were often synchronized with the CPU clock (clocked) and were used with early microprocessors. In the mid-1970s, DRAMs moved to the asynchronous design, but in the 1990s returned to synchronous operation. [26] [27] In 1992 Samsung released KM48SL2000, which had a capacity of 16 Mbit. [28] [29] and mass-produced in 1993. [28]
The Alpha 21364 has two integrated memory controllers that support Rambus DRAM (RDRAM) that operate at two thirds of the microprocessor's clock frequency, or 800 MHz at 1.2 GHz. Compaq designed custom memory controllers for the Alpha 21364, giving them capabilities not found in standard RDRAM memory controllers such as having all the 128 pages ...
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Address and control signals are still sent to the DRAM once per clock cycle (to be precise, on the rising edge of the clock), and timing parameters such as CAS latency are specified in clock cycles. Some less common DRAM interfaces, notably LPDDR2 , GDDR5 and XDR DRAM , send commands and addresses using double data rate.
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