Flash Memory - Samsung ML-2251N Service Manual

4.3.1 ASIC (SPGPm)
• ARM946ES
- 32-bit RISC embedded processor core
- 16KB instruction cache and 16KB data cache
- No Tightly Coupled Memory
- Memory Protection Unit &CP15 control program
• Dual bus architecture for bus traffic distribution
- AMBA High performance Bus (AHB)
- System Bus with SDRAM
• IEEE1284 compliant parallel port interface
• Printer Video Controller for LBP engines
• Graphic Execution Unit for Banding support of Printer Languages
• Printer Video Controller for LBP engines
- PVC : Printer Video Controller without RET Algorithm
- HPVC : Printer Video Controller with RET algorithm
(Line Memory & Lookup Table Memory : 512 x 8 , 4096 x 16)
• Engine Controller
- Motor Control Unit
- Motor Speed Lookup Table Memory (128 x 16 x 2)
- Pulse Width Modulation Unit
- 4 Channels are supported
- ADC Interface Unit
- 3 ADC Channels are available
- ADC Core (ADC8MUX8)maximum clock frequency :3 MHz
• USB 2.0 Interface
• Package : 272 pins PBGA
• Power : 1.8V(Core), 3.3V(IO) power operation
• Speed : 166MHz core(ARM946ES)operation,60MHz bus operation
4.3.2 Memory
The ML2250 has Flash ROM and DRAM memory units. There are 2 SODIMM sockets to enable extra DRAm or Flash
ROM (Postscript Option) to be fitted.
On Domestic 9Korean) models additional Mask ROM is also fitted: to store domestic Fonts such as PCL Font and
KS5895, KSSM etc.
- Capacity :16MByte
- Access Time :100nsec

4.3.3 Flash Memory

It stores the system program, this can be updated by downloading the system program through the PC Interface. In
export models PCL fonts are also sred in the flash memory.
• Capacity :2M Byte
• Access Time :70 nsec
Samsung Electronics
Summary of product
Service Manual
4-11