Cisco 1600 User Manual download pdf (Page 4)

Cisco 1605

Figure 5  Cisco 1605R Rear Panel

Block Diagram

Figure 6 represents the basic block diagram of the 1600 router.

Figure 6  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®

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 Details section.•

BusesBuses are used by the CPU to access various components of the system and transfer

instructions and data to or from specified memory addresses.

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,

Non−Volatile RAM (NVRAM), PCMCIA Flash, and WIC.

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Input/Output (I/O) Bus allows the M68360 to individually control other devices through the

SCCs. This includes Universal Asynchronous Receiver/Transmitter (UART), the Ethernet

controller, and the WAN port interface.

♦

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Cisco − Cisco 1600 Series Router Architecture

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Cisco 1600 User Manual Page 4