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3.1.5 Memory Map
The 5509 provides 16M bytes of total memory space composed of on-cip RAM, on-chip ROM, and external
memory space supporting a variety of memory types. The on-chip, dual-access RAM allows two accesses
to a given block during the same cycle. The 5509 supports 8 blocks of 8K bytes of dual-access RAM. The
on-chip, single-access RAM allows one access to a given block per clock cycle. The 5509 supports
24 blocks of 8K byte of single-access RAM.
The remainder of the memory map is external space that is divided into four spaces. Each space has a chip
enable decode signal (called CE) that indicates an access to the selected space. The External Memory
Interface (EMIF) supports access to asynchronous memories such as SRAM and Flash, and synchronous
DRAM.
April 2001 − Revised January 2008
Functional Overview
SPRS163H
33
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