Ricoh Aficio SP 5100N, Service Manual

Page: 147 / 175

Engine Hardware Specifications
SM 6-9 G186
Det
ailed
Section
Des
cription
s
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
Dual Channel
32 bit up to 200
MHz
DDR1/DDR2
SDRAM Controller
Feroceon CPU
32 KB
L1
Dcache
32 KB
L1
Icache
PCI/PCI-
X
64-bit
port
Mbus-L to
Mbus
Bridge
Mbus Crossbar extension)
64 bit @ 166 MHz
GPPs,
UART x 2,
TWSI,
Flash
PCI-
Express
x 1 port
Gigabit
Ethernet
port
USB 2.0
port
Local bus 4 bit up to 200 MHz
g186d505
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.