Brother International HL-2400C Service Manual - Page 96

2.3.2 Circuit (1) CPU block • Model name: MB86832-100 (SPARC lite), RISC CPU manufactured by Fujitsu • Clock speed: 33.1776MHz (external) / 99.5328MHz (internal) • Cache memory: 8KB (Command cache) / 8KB (Data cache) • Appearance: 176-pin QFP (2) ASIC block • Model name: MF87F1610 manufactured by Fujitsu • Appearance: 240-pin QFP • Functions: ∗ Controls CPU ∗ Controls memory ∗ Controls interrupts ∗ Timer ∗ External interfaces (Centronics, RS-232C, PCMCIA, MIO) ∗ Engine interface (Engine control, Video signal control) ∗ Supports Software (3) ROM block The ROM stores the CPU control program and font data. ROMs used are an 8Mbytes masked ROM, and a 2 Mbytes flash ROM which can be rewritten on the board. • Access time: • Appearance: • Model name: • Access time: • Appearance: less than 120nsec. 42-pin DIP MBM29F800T-120 manufactured Fujitsu less than 120nsec. 48-pin TSOP (4) DRAM block DRAMs are used for the receiving buffer and the working area of the CPU. The DRAM block contains eight 16Mbit EDO RAM, thus having 16MB memory capacity in total. • Model name: • Type: • Access time: • Appearance: M5M41705CJ-6 manufactured Mitsubishi (or equivalent). 16Mbit EDO DRAM (4x4, 164,304bit) less than 80nsec. 26-pin SOJ IV-47