Samsung ML-1640 Service Manual page 25

2.2.2.3 Asic(SPGPm) Specification
2.2.2.3(a) Introduction
Jupiter4E is One-Chip micro-Controller for Low cust Laser beam Printer.
1. One Chip Laser Beam Printer Controller
- GDI only
- AMBA AHB used for high speed bus transactions between masters and slaves
- AMBA APB used for low speed bus transactions between ARM core and peripherals
- 3 PLLs ( 2 Dithered PLL and 1 General PLL)
first for CPU(150MHz), AHB(75MHz), APB(75MHz),
second for USB(48MHz)
third for PVC(59MHz)
- 75MHz system operation
- 1.8V power operation
- 3.3V tolerant input and bi-directional I/Os
- SDRAM and IO Address / Data signals multiplexing
2. Integrated ARM940T 32-bit RISC embedded processor core
- 150MHz core frequency operation
- Harvard Architecture Cache : 4KByte Instruction cache, 4KByte Data cache
- Single memory bus architecture
3. Built in Flash Memory
- 4MBits (128Kx32bits)
- Serial programming mode using flash programmer tool
- Internally flash memory read / write operation support
- Programmable access timing control
4. 32MB Special function Register Area
5. Directly connected to 3 external IO banks (IOC)
- 32 MB size in each IO bank
- Programmable setup, access, hold timing
- Programmable recovery time for slow devices
- Allows to access peripheral devices such as GPIO control logic
6. Directly connected to 1 external ROM bank (ROMC)
- 32 MB size for one ROM bank
- One external flash memory attachable.
Service Manual
Product spec and feature
2-16
Samsung Electronics