The FORESEE Mobile Low-Power DDR4 SDRAM (LPDDR4X/LPDDR4) is a high-speed CMOS, dynamic random-access memory internally configured with either 1 or 2 channels. Each channel is comprised of 16 DQs and 8 banks.
The LPDDR4X/LPDDR4 uses a 2-tick, single-data-rate (SDR) protocol on the CA bus to reduce the number of input signals in the system. The term "2-tick" means that the command/address is decoded across two transactions, such that half of the command/address is captured with each of two consecutive rising edges of CK. The 6-bit CA bus contains command, address, and bank information. Some commands such as READ, WRITE, MASKED WRITE, and ACTIVATE require two consecutive 2-tick SDR commands to complete the instruction.
The FORESEE LPDDR4X/LPDDR4 uses a double-data-rate (DDR) protocol on the DQ bus to achieve highspeed operation. The DDR interface transfers two data bits to each DQ lane in one clock cycle and is matched to a 16n-prefetch DRAM architecture. A write/read access consists of a single 16n-bit-wide data transfer to/from the DRAM core and 16 corresponding n-bit-wide data transfers at the I/O pins.
The LPDDR4X/LPDDR4 uses a 2-tick, single-data-rate (SDR) protocol on the CA bus to reduce the number of input signals in the system. The term "2-tick" means that the command/address is decoded across two transactions, such that half of the command/address is captured with each of two consecutive rising edges of CK. The 6-bit CA bus contains command, address, and bank information. Some commands such as READ, WRITE, MASKED WRITE, and ACTIVATE require two consecutive 2-tick SDR commands to complete the instruction.
The FORESEE LPDDR4X/LPDDR4 uses a double-data-rate (DDR) protocol on the DQ bus to achieve highspeed operation. The DDR interface transfers two data bits to each DQ lane in one clock cycle and is matched to a 16n-prefetch DRAM architecture. A write/read access consists of a single 16n-bit-wide data transfer to/from the DRAM core and 16 corresponding n-bit-wide data transfers at the I/O pins.
