Cisco Systems 1600 Manual De Usuario

Figure 4: Cisco 1604 and 1604R Rear Panel

Figure 5: Cisco 1605R Rear Panel

The Cisco 1600 series routers are either run−from−Flash or run−from−RAM models.  Router model names
with an R are run−from−RAM routers; all other models are  run−from−Flash.  A more detailed description
of these two memory architectures are described in Cisco 1600 Series Memory Architecture and Comparison
of Cisco 1601−Cisco 1604, and Cisco 1605−R.

The following figure represents the basic block diagram of the 1600 router:

The basic characteristics and functions of each block in this platform can be summarized as:

Processor: The processor used in the 160x series is the Motorola 68360 Complex Instruction Set
Computer (CISC). The main job of the processor is to load instructions defined in Cisco IOS

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software from PCMCIA Flash or from RAM (for the R models) and execute them, which basically
involves some manipulation of data. The M68360 is an embedded controller, and has a 32−bit
address, a 32−bit data bus, a 33 MHz internal clock, and a built−in Serial Communication Channels
(SCC).

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Memory: This is discussed in more detail in the Memory section below.

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Buses are used by the CPU for accessing various components of the system and transferring
instructions and data to or from specified memory addresses.

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CPU Bus is for high speed operations, with direct processor access. It has a 32−bit address
and 32−bit data at 33 MHz. These include access to dynamic RAM (DRAM), Boot ROM,

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Cisco 1600 Series Router Architecture