A 48-bit memory address can directly address every byte of 256 terabytes of storage. 48-bit can refer to any other data unit that consumes 48 bits (6 octets) in width. Examples include 48-bit CPU and ALU architectures that are based on registers, address buses, or data buses of that size.

2011年7月16日 · 32-bit processors have 2^32 possible addresses, while current 64-bit processors have a 48-bit address space. My expectation was that if it's a 64-bit processor, the address space should also be 2^64. So I was wondering what is the reason for this limitation?

2019年11月18日 · The original hardware of the IBM System/38 was a 48-bit CISC, but the design allowed switching that to 64-bit PowerPC RISC without re-compiling. The Toshiba TLCS-12 family was designed from 1971-73 and is 12-bit.

2014年1月7日 · The first implementation of IA-32 processors with Intel 64 architecture supports a 48-bit linear address. This means a canonical address must have bits 63 through 48 set to zeros or ones (depending on whether bit 47 is a zero or one) .

只用48位的原因很简单：因为现在还用不到完整的64位寻址空间，所以硬件也没必要支持那么多位的地址。 设计为带符号扩展的原因也很简单：很多环境中，寻址空间的高一半（hi

The CDC 1604 is a 48-bit computer designed and manufactured by Seymour Cray and his team at the Control Data Corporation (CDC). The 1604 is known as one of the first commercially successful transistorized computers .

2014年2月4日 · A 64-bit processor could achieve external address/data buses for its complete address space with 64, 32, 16, 8, 4, 2, or 1 address pin if the bus is synchronous and the address bits get multiplexed in time.

2024年10月17日 · 位数越少，CPU 构建成本越低。对于 ARM 处理器，可以看到下面的描述。也就是说，48 bit 不是定数，未来也可能变化。如此这样，我们就可以在 HashSlot 里存下更多信息了。的指针地址默认都只使用低 48 位，高16 位总是 0。在 Intel CPU 和 Arm CPU 中，

2020年9月20日 · Intel Core i7 supports a 48 -bit (256 TB) virtual address space and a 52 -bit (4 PB) physical address space. below is my question. Q1-since we mostly use 64 bits machine, how come the virtual address is only 48 bits? Shouldn't it be 64 bits virtual memory as well?

A 48-bit memory address can directly address every byte of 256 terabytes of storage. 48-bit can refer to any other data unit that consumes 48 bits (6 octets) in width. Examples include 48-bit CPU and ALU architectures are those that are based on registers, address buses, or …