Memory Circuits; Flash Eeprom - ENCAD NovaJet Pro 600e Service Manual

NovaJet PRO 600e Service Manual
The gate array contains the hardware logic for dot firing, monitoring
changes in the Carriage Assembly position, controlling DMA through
the parallel port, and generating the PWM (Pulse Width Modulation)
waveforms for the servo controller.
The gate array is a Xilinx device. It is a static RAM-based field pro-
grammable gate array. This means that the logic that it implements is
determined by configuration information in internal RAM storage.
Each time power is turned on, this information must be downloaded
from the system ROM. This type of gate array allows for the flexibility
of upgrading the logic by simply downloading the new system software.

Memory Circuits

Memory is used to retain large amounts of information. This informa-
tion is stored in the device memory in the form of binary bits.
Printer memory consists of Flash EEPROM, DRAM, and EEPROM.
Maximum installable memory is as follows:

Flash EEPROM

Flash EEPROM is Electrically Erasable, Programmable, Read Only
Memory used to store instructions and data constants which the
microprocessor can access and interpret, with no loss of information
when power is off.
2-8 Theory of Operation
DRAM = 128 MB
Flash EEPROM = 1 MB
Serial EEPROM = 1KB