Others; Internal Block Diagram; Sensor Input Circuit; Paper Empty Sensing - Ricoh G186 Service Manual

DDR SDRAM: It is used as Swath Buffer, System Working Memory Area, etc. when
printing. It stores Font List, compressed into Flash memory, on DRAM and uses it as PCL
fonts in case of export models.
- Capacity: 128 Byte(Basic), up to 512Mbyte (User Option)
- Type: DDR-II SDRAM 200 MHz, 32bit

Others

The Option PBA can be mounted for supporting the serial communication.

6.3.2 INTERNAL BLOCK DIAGRAM

Feroceon CPU
32 KB 32 KB
L1 L1
Dcache Icache
Local bus 4 bit up to 200 MHz
Mbus Crossbar extension)
64 bit @ 166 MHz
GPPs, PCI/PCI-
PCI-
UART x 2,
Express
TWSI,
x 1 port
Flash

6.3.3 SENSOR INPUT CIRCUIT

Paper Empty Sensing

The Paper empty sensor (Photo Interrupter) on the engine board transmits a "paper drawer
empty" signal to the CPU when there is no paper, triggered by the actuator. The empty
condition - read from the D0 part of the CPU.
SM
Mbus-L to
Mbus
Bridge
Gigabit
USB 2.0
X
Ethernet
64-bit
port
port
6-9
Engine Hardware Specifications
Dual Channel
32 bit up to 200
MHz
DDR1/DDR2
SDRAM Controller
port
g186d505
G186