What is the function of packet memory?

Cisco routers generally uses two types of
memory, Flash and DRAM. "cisco 2500 (68030) processor (revision A) with 4096K/2048K bytes of memory". The first memory number is the DRAM and
the second is the packet memory. What function does packet memory serve?
Thanks.

Packet memory is used to store incoming and outgoing packets. And it is also called shared memory in Cisco 2500.

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