IBM 6400-I15 Maintenance Manual - Page 50
Engine Controller, 80C166 Micropressor, Bus cofig, Power Reduction, EC Flash Memory, MECA ASIC
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Engine Controller The engine controller (EC) consists of four main elements: ♦ 80C166 Microcontroller ♦ 128KB 5.0V-only FLASH program memory, organized as 64K x 16 bits. This memory is not expandable. ♦ MECA (Mechanism Engine Control ASIC) ♦ Analog drive circuitry 80C166 Microprocessor The Siemens SAB 80C166 is a high-integration microcontroller. It has many features that suit it extremely well to real-time control applications. This controller and the MECA ASIC provide the functionality of three separate processors used in earlier controller board architectures. In this manual, the 80C166 is referred to as either the EC or the 166. The 166 used on the CMX board runs at 20MHz and is housed in a 100-pin metric rectangular flat pack. Bus Configuration The 166 bus is configured for 18-bit address, 16-bit data, non-multiplexed and segmented operation. The flash memory runs with zero wait states. An external PAL is used for address decoding. Power Reduction The 166 chip has two power reduction modes: idle and Energy Star. Idle mode is not used. In Energy Star mode, +48V and all motors are de-energized, but the 166 operates as normal. EC Flash Memory The EC stores all boot code, program code, and tables in its own local flash memory. This flash is organized as 64K x16 bits and uses the same technology as the DC flash: it is + 5.0V-only and is rated for a minimum of 100,000 write/erase cycles. EC memory is fixed; it is soldered to the controller board. Its contents can be updated through the DC (through the serial or parallel ports). At run time, the EC also stores tables in shared DRAM, which is accessed through the Cajun bus. MECA ASIC The 166 uses numerous counters, PWM generators, and FIFOs in the MECA to control many printer motor functions. The MECA is a custom gate array, specifically designed to drive this system. Analog Drive Circuitry The analog drive functions convert 48 and 8.5 volts into the power used to drive the motors and hammers in the printer. Sensors are used to monitor the operation and status of critical components within the printer. 50 Principles of Operation