Copy processor board The CPB is the link between the formatter in the print engine and the SCB in the scan engine. Control signals from the formatter are sent to the CPB. The CPB sends these control signals to the SCB. After the scanning process is completed by the SCB, the scanned data is sent to the CPB. The CPB processes the image and sends the image data to the formatter. CPB terminology ASIC (application-specific integrated circuit) (callout 1) is the system controller that provides PCI, DIMM interface, and processor interface, and performs monochrome data compression. DSP (digital signal processor) (callout 2) runs image processing algorithms.
Firmware DIMM (Dual inline memory module) (callout 3) contains firmware that controls the system. FPGA (field programmable gate-array) (callout 4) provides an interface to the scanner, SRAM, DSP, and PCI bridge (front-end processing is performed). IEEE 1394 phy (physical layer) (callout 5) is the interface from the CPB to the formatter. IEEE 1394 protocol chip (callout 6) connects the PCI bus to the IEEE 1394 Phy. MIPS (Million instructions per second) processor (callout 7) is the system processor that runs the firmware. PCI (peripheral component interface) bridge (callout 8) connects the PCI bus to the FPGA.
RAM DIMM (callout 9) is the main memory system, and is temporary storage for image data and firmware variables. RAM for DSP (digital signal processor) (callout 10) provides temporary storage for image processing in the DSP. SRAM (static random-access memory) (callout 11) is memory for aligning the scanner image data. 10 10 5 8 8 5 3 2 3 2 9 9 6 6 1 1 7 7 10 11 11 4 10 4 Figure 60. Copy processor board 94 Chapter 5 Theory of operation C8523-90921