Asic (Spgpm); Memory; Flash Memory - Xerox Phaser 3150 Service Manual

4.3.1 ASIC (SPGPm)

ARM946ES
32-bit RISC embedded processor core
16 KB instruction cache and 16 KB data cache
No tightly coupled memory
Memory protection unit and 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 and 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: 1.8 V(Core), 3.3 V(IO) power operation
Speed: 166 MHz core (ARM946ES) operation, 60 MHz bus operation

4.3.2 Memory

The board has Flash ROM and DRAM memory units. There are 2 SODIMM sockets to enable extra DRAM or Flash
ROM (PostScript option, not available in all countries) to be fitted.

4.3.3 Flash Memory

Flash memory stores the system software code. This can be updated by downloading the system program through the
PC Interface. PCL fonts are also stored in the flash memory.
Capacity: 2 MB
Access Time: 70 nsec
Summary of Product
Service Manual 4-9