JEDEC Publishes GDDR7 Graphics Memory Standard

JEDEC Solid State Technology Association, the global leader in the development of standards for the microelectronics industry has announced publication of JESD239 Graphics Double Data Rate (GDDR7) SGRAM. This groundbreaking new memory standard is available for free download from the JEDEC website. JESD239 GDDR7 offers double the bandwidth over GDDR6, reaching up to 192 GB/s per device, and is poised to meet the escalating demand for more memory bandwidth in graphics, gaming, compute, networking and AI applications. JESD239 GDDR7 is the first JEDEC standard DRAM to use the Pulse Amplitude Modulation (PAM) interface for high frequency operations. Its PAM3 interface improves the signal to noise ratio (SNR) for high frequency operation while enhancing energy efficiency. By using 3 levels (+1, 0, -1) to transmit 3 bits over 2-cycles versus the traditional NRZ (non-return-to-zero) interface transmitting 2 bits over 2-cycles, PAM3 offers higher data transmission rate per cycle resulting in improved performance. Additional advanced features include: Core independent LFSR (linear-feedback shift register) training patterns with eye masking and error counters to improve training accuracy while reduce training time. Doubles the number of independent channels doubles from 2 in GDDR6 to 4 in GDDR7. Support for 16 Gbit to 32 Gbit densities including support for 2-Channel mode ...