HP C7769B Service Manual - Page 267
Electrical System, Introduction, Hardware Description
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Electrical System Functional Overview Introduction The Printer's engine electronics (Main PCA) is controlled by a Kayak ASIC. Kayak is the application-specific integrated circuit (ASIC), designed in Hewlett-Packard's Vancouver Printer Division, forming the heart of the thermal-inkjet large format printer digital electronics. Electronics Enclosure Cooling Fan Formatter Main PCA LAN Card Hardware Description n The Kayak ASIC is fed with a 15.975MHz crystal-quartz which through a phase lock loop (PLL) is raised to 192MHz and after that divided to the ColdFire frequency of 96MHz and further divided to the external memory bus of 48MHz. n The Kayak ASIC incorporates the CF3_g Motorola CF3MRSX processor mega cell. As implemented in Kayak, the processor, with 8KB of unified cache, has a maximum operating frequency of 98MHz and at this frequency it is capable of approx. 70 MIPS. n Two physical EIO slots are supported from which the optional formatters and EIO cards will be plugged. Three expansion options are currently supported. n The Main PCA will come with an on-board 2MB(x16) flash memory that will allow both the end user and service engineers to upgrade with the latest firmware code available. n A total of 16MB SDRAM (x32) or 32MB SDRAM (depending on the Printer Model) will be loaded in the engine PCA, not allowing further user self-memory upgrades. HP DesignJets 500 and 800 Series Printers Service Manual 10-3