Samsung SF4500 Circuit Descriptions
6. Circuit
6-1 Main PBA
6-1-1 Summary
The main circuit that consists of CPU, MFP
c o n t roller (built-in 32bit RISC processor core :
ARM7TDMI) including various I/O device
drivers, system memory, scanner, printer, motor
d r i v e r, PC I/F, and FAX transceiver controls the
whole system. The entire stru c t u re of the main
c i rcuit is as follows:
Fig.6-1-1. Entire Structure of Main Circuit for Each Key Signal
Samsung Electronics 6-1
6-1-2 MFP Controller (KS32C6200 : U16)
M F P C o n t roller consists of CPU(ARM7TDMI RISC
p rocessor), 2K-byte cache, data and address buses,
serial communication part with LIU(Line Interface
Unit), OPE(OPERATION PANEL) print head cont ro l l e r, parallel port interface, external DMApart to
receive data from external color image pro c e s s o r
(SCANIP:U18), LF/CR motor diver
c o n t roller and I/O contr o l l e r.
6-1-2-1. SYSTEM CLOCK
The internal clock frequency is 30MHz. 30MHz
system clock (MCLK) supplied from the outside is
used without being divided inside.
6-1-2-2. DATA& ADDRESS BUS CONTROL
• /RD & /WR
/RD & /WR signals are synchronized with
MCLK(30MHz) and become LOW ACTIVE.
These signals are strobe signals used to read and
write data when each CHIP SELECT is connected
with /RD and /WR pin of RAM, ROM, MODEM
and the outside devices and becomes active.
• C H I P SELECT (/IP_CS, /ROMCS, /MCS /
R A M C S )
- /IP-CS : SCANIP(U18) CHIP SELECT (LOW
A C T I V E )
- /ROMCS : ROM/FLASH MEMORY(U5) CHIP
SELECT (LOW A C T I V E )
- /MCS : MODEM(U15) CHIP SELECT (LOW
A C T I V E )
- /RAMCS : SRAM (U14) CHIP SELECT (LOW
A C T I V E )
When each CHIP SELECT is low, data can be read or
w r i t t e n .
• D0 - D15
- 16bit data bus
• A0 - A 1 7
- ADDRESS BUS (A18 - A21 are re s e r v e d . )
6-2 Samsung Electronics
6-1-2-3, LIU(Line Interface Unit) Serial
Communication Part
U A RT (Universal A s y n c h ro n o u s
R e c e i v e r / Transmitter) at KS32C6200 enables the
main and LIU, main and OPE to transmit serial
Fig.6-1-2. UART BLOCK DIAGRAM
data. The block diagram of UART is as follows:
(Fig.6-1-2) KS32C6200 has 2 UART channels. The
baud rate is 9600bps.
Fig.6-1-3 UART DATAFORMAT
Samsung Electronics 6-3
6-1-2-4 EXTERNAL D M A
It brings data from an external device (SCANIP:U18)
using DMAchannel 0. DMAREQUEST sent from an
external device to KS32C6200 activates DMA
ACKNOWLEDGE signal and drives DMAchannel 0
to produce CHIP SELECT and READ STROBE (/RD)
at the external
device and bring data from it. It generates address of
destination memory, CHIP SELECT and WRITE
STROBE (/WR) in order to move this data into
destination memory, and then stores the data.
Fig.6-1-4 EXTERNAL DMA TIMING DIAGRAM
6-4 Samsung Electronics
6-1-2-5. DRAM CONTROLLER
6-1-2-6. PARALLEL PORT INTERFACE
As KS32C6200 has DRAM controller in it, DRAM can
be connected with external memory.
The control mode of DRAM controller enabling
E A R LY WRITE, NORMALREAD, PAGE MODE,
and BYTE/HALF WORD ACCESS supports EDO
DRAM as well as normal DRAM. DRAM
READ/WRITE signals are /R D and /W Rs i g n a l s
used to control system buses. It supports CAS
BEFORE RAS for DRAM REFRESH and self-re f re s h
mode for DRAM backup. Connected with common
/L C A S , /U C A Sand RAS [1:0], it consists of 2 banks.
Though each may be connected with up to 1M - 4M
h a l f w o rd, two (2) of 512 Kbytes are
connected for this pro d u c t .
This part connected with the computer through the
c e n t ronics connector makes possible parallel
interface with the computer. Data is transmitted
a c c o rding to the standard of IEEE P1284. This MFP
c o n t roller supports compatibility mode the
traditional way to transmit print data, nibble mode
(4bit data) to upload data to the computer, and
duplex high-speed transmission with the computer
E C P (Extended Capabilities Port: 8bit data
transmission) all together.
It enables PC data to be printed and scanned data to
be uploaded quickly to the computer. Besides,
various data transmission and reception with the
computer such as uploading received fax data,
downloading fax data to be sent, and monitoring system control signals and system conditions are carried
out here .
Fig.6-1-5 Compatibility Hardware handshaking Timing
Samsung Electronics 6-5
Fig.6-1-6 ECP Hardware Handshaking Timing (forward)
Fig.6-1-7 ECP Hardware Handshaking Timing (reverse)
6-6 Samsung Electronics
6-1-2-7. INKJET HEAD CONTROLLER
This part produces major control signals used to
drive INKJET head. It consists of signals to drive
head nozzles, /HGA[13:1], HOE[16:1], /F A U LTT E S T, /HEAD-EN, and BIASOFF, and consists of signals to check the status of the head, HEAD-DATA .
It has double height print head, system 208 nozzles
for mono and 192 nozzles for color, and uses
/HGA[13:1], HOE[16:1] signals and /HEAD-EN to
drive these nozzles. Fig.5-1-8 is timing diagram of
each signal.
Fig.6-1-8 Timing Diagram to Drive Head
Samsung Electronics 6-7
Fig.6-1-9. Timing Diagram for Each Nozzle
The above control signals are sent to head driver and
the head driver converts these signals to the level
( + 11.75V) to drive head nozzles.
5-1-2-8. PRINTER MOTOR CONTROLLER
(CRPHA, CRPHB, CRIA0, 1, CRIB0, 1,
LFPHA, LFPHB, LFIA0, 1, LFIB0, 1)
M F P C o n t roller (KS32C6200:U16) supports 2
stepper motors. It controls CR (Carriage Return)
motor used to print documents and LF (Line Feed)
motor used to feed and eject paper.
CR motor controller can support 75, 150, 200, 300,
600, or 1200dpi according to resolution, while LF
motor controller supports uni-polar and bi-polar
a c c o rding to the kind of motors. Though full step,
half step and software control are possible for both,
bi-polar CR motor is controlled half step and LF
motor is controlled half step and quarter step here .
6-8 Samsung Electronics
5-1-2-9. I/O PORT FOR KS32C6200
PIN NAME
G O P 0 / T X D 0
G O P 1 / T X D 1
G O P 2 / n E D A C K
G O P 3 / TO N E
G O P 4 / n R S T 0
G O P 5 / n I O W R 1
G O P 6 / n I O W R 2
G O P 7 / n I O R D 1
G O P 8 / n I O R D 2
G O P 9 / C L K O U T
G O P 1 0 / F I R E P S
G O P 11 / n H S C
PIN NO
1 2 2
1 2 4
1 3 9
1 4 9
1 5 0
1 3 4
1 5 5
1 5 6
1 5 1
1 5 2
1 5 3
1 5 4
I/O PORT NAME
p
p
p
p
p
p
p
p
p
p
p
p
L I T _ T X D
O P E _ T X D
n X D A C K
K E Y C L I C K
n R S T 0
n FA U LT _ T E S T
R X _ C T L
n H E A D _ E N
TO N E _ C T L
I P _ C L K
n R S T _ O U T
B I A S O F F
DESCRIPTION FOR STATE
H L
Serial Data Output to ILIU
Serial Data Output to OPE
D M AAcknowledge to
–
S c a n _ I P
Keyclick To n e
Watchdog Reset Signal Output
– Head Fault Test Enable
Line for RX. Line for TX. or Remote
– Head Enable
Line Monitoring K e y c l i c k
Clock Output for Scan_IP
External Reset Output
– Head Data Read
G O P 1 2 / n H S M
G I P 0 / n R X D 1
G I P 1 / n R X D 2
G I P 2 / n E I N T 1
G I P 3 / n E I N T 2
G I P 4 / n E D R E Q
G I P 5 / U C L K
G I O P 0 / T C K
G I O P 1 / T M S
G I O P 2 / T D I
G I O P 3 / n T R S T
G I O P 4 / T D O
3 0
1 2 3
1 2 5
1 3 6
1 3 7
1 3 8
1 2 8
3 7
3 8
3 9
4 0
4 1
p
I
I
I
I
I
I
B
B
B
B
B
C R _ R E F
L I U _ R X D
O P E _ R X D
n M I R Q
n T X _ I N T
n X D R E Q
H E A D _ D ATA
T C K
T M S
T D I
n T R S T
T D O
LQ Mode Printing Draft Mode Printing
Serial Data Input from ILIU
Serial Data Input from OPE
– Modem Interrupt request
SCAN motor Interrupt
–
–
Serial Head Data from Head
Test Clock for ICE
TA P Controller Enable –
Serial Data Input from Emulator
– TA P Controller Reset
Serial Data Output to Emulator
D M ARequest from Scan_IP
r e q u e s t
Samsung Electronics 6-9
6-1-2-10. RESET CIRCUIT
As for this product, there are 2 power resets of primary reset(/F-POR) and secondary reset(/POR) and
also reset by watchdog timer (/RSTO). Primary re s e t
is used to initialize flash memory when the system is
turned on, while secondary reset is used to initialize
the whole system by initializing MFP c o n t ro l l e r
(KS32C6200) after primary
reset. Primary reset makes flash memory wait in
READ mode to fetch program
codes, and secondary reset makes the main
c o n t roller (KS32C6200) wake up and initialize
external peripherals to operate the system.
Fig.5-1-10 is Power Reset Timing Diagram.
Fig.6-1-10 POWER RESET TIMING DIAGRAM
• POWER MONITOR (U103: KIA7045F)
If +5V supplied to KIA7045F is so unstable as to
reach +4.65V - +4.35V (typically 4.5V), it will
recognize it as power failure. Then KIA7045F
output terminal becomes low (0V) and the voltage
is impressed to flash memory and KS32C6200, ru n-
KS32C6200 are reset first. Thereafter modem, print
c o n t rol parts and SCANIP(Color Image Pr o c e s s o r )
linked to /RSTOUT terminal of KS32C6200 are
reset as well. KIA7045F output
terminal of open drain stru c t u re is pulled up 5.1k Ω
and put out.
ning RESET (LOW ACTIVE). Flash memory and
6-10 Samsung Electronics
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