Why Spansion 29GL032AtAIR4 has extra memory compared to ST M29W320DB? Both of them have 4 Mb memories?

For Spansion S29GL032ATFIR4 TSOP48, the flash region is made up of 32M bit flash
and 128 word Hi-Rom. Our memory size is 32M+128. For a 32M flash memory, the buffer
is from 0x000000 to 0x3FFFFF. For 128Word Hi-Rom, the buffer is from 0x400000H to
For ST M29W320DB TSOP48, the memory space is from 0 to 3FFFFF.

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