Xerox Phaser 3450, Service Manual, Page: 128 / 155

9
9
9-1
BLOCKDIAGRAM
Service Manual
9. Block Diagram
AD DR( 1: 23)
29L V160
16 Mb it Fla sh
M emo ry
Ma sk Fo n t ROM
ROM
SPGPm
n FSYNC
A CK* , BU SY,
SEL E CT , ERROR,
FA UL T *
SEL I N*
ST ROB E*
A UT OFD*
I NI *
PD(0 :7 )
EIRQ(0:3)*
4
nI OCS(0:5)*
6
RCS(0 :3 )
4
n WA I T
n WR
I NT *
n RD
Ce nt ro n ic s
Co nn e c t or
PAN EL 5Pi n
6
H VPS Int er face
24
16
HV PS/ SM PS B ’d
100PI N DI M M
L CD Pane l
6
0
P
in
N
e
t
w
o
r
k
C
o
n
n
e
c
to
r
Network
Card
DATA(16:31)
n WAI T
n RD
nWR
NPC_RE SET
I OCS
EI RQ
Co mput er
Sy s te m c l o ck
1 2 M Hz( X- t al )
FS 7 8 1
Fr eq ue nc y
Sca lin g E M I
A t t en uat o r
RE SET *
XC61 FN 31 1 2M R
DA T A (16:31)
V id eo- Clo ck
78 M Hz
V CL K *
32
M emory Data Bus
11
M emory Address Bus
14
SDRAM _CA S,SDRAM_RAS,
BA0*,BA1* ,SDRAM_W E* ,
SDRAM _CS( 0:1) ,SDQM (0:3) ,
SD_CLK (1:2) ,CL KE
64M bi t SD RA M
K 4S641632C
SDRA M
64M bi t SD RA M
K 4S641632C
DRA MA (0:1 1)
DRA MD(0:3 1)
100PI N DI M M
7 4A CT 2 4 5
T r an sce iv e r
3
LSU
L REA DY* , ,L SY NC* , V DO* , P_MOT * ,CL K
U ART
12
Regul at or
1.8V
U SB c l oc k
12M H z(OSC)
93 C66
4M bit
Ser ial
EEPR OM
A DDR(1 :1 3 )