在Aligent的一份技术文档中：DDR SDRAM memory controller [Option] – Provides an interface to two (optional) external
SDRAM extensions. Each port is 64 bits wide. Each Synchronous Dynamic Ram (SDR) block
runs at up to 166 MHz, provides a capacity of 32 Mwords or 256 MB, and can achieve continuous
transfer rates of ~ 2 GB/s.
按照这个理解，这里的word就是一个地址单元或者是芯片的数据位宽，有用word表示数据位宽的规范吗？
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