Sanyo DC-DA1250M Service Manual page 12

IC BLOCK DIAGRAM & DESCRIPTION
IC103 M12L16161A-7TG (Synchronous DRAM)
Bank select
CLK
ADD
LCKE
LRAS LCBR
CLK CKE
PIN NAME
CLK System Clock
CS Chip Enable
CKE Clock Enable
A0~A10/AP Address
BA Bank Select Address
RAS Row Address Strobe
CAS Column Address Strobe
WE Write Enable
L(U)DQM Data Input / Output Mask
IC412 KIA6282K (Dual Audio Power Amplifier)
VCC1
IN-1 6
5
NF1
30Ω
RIPPLE
4
THERMAL SHUT DOWN
TERMINAL
PROTECTION CIRCUIT
7
IN-2
8
NF2
30Ω
Data Input Register
512K
512K
Column Decoder
Latency & Burst Length
Programming Register
LWE LCAS
Timing Register
CS RAS CAS WE L(U)DQM
Active on the positive going edge to sample all inputs.
Disables or enables device operation by masking or enabling all inputs except CLK,CKE
and L(U)DQM.
Makes system clock to freeze operation from the next clock cycle.
CKE should be enabled at least one cycle prior to new command.
Disable input buffers for power down in standby.
Row / column addresses are multiplexed on the same pins.
Row address : RA0~RA10, column address : CA0~CA7
Selects bank to be activated during row address latch time.
Selects bank for read/write during column address latch time.
Latches row addresses on the positive going edge of the CLK with RAS low.
Enables row access & precharge.
Latches column addresses on the positive going edge of the CLK with CAS low.
Enables column access.
Enables write operation and row precharge.
Latches data in starting from CAS, WE active.
Makes data output Hi-Z tSHZ after the clock and masks the output.
Blocks data input when L(U)DQM active.
VCC2
12 3
1
B.S.1
+
2 OUT-1
Ch-1
-
20KΩ
BIAS CIRCUIT
+
10
Ch-2 OUT-2
-
11
B.S.2
20KΩ
9
GND
16
X
16
X
LDQM
LWCBR
Input Function
- 11 -
LWE
V 1
DD
DQ0 2
LDQM
DQ1 3
V 4
SSQ
DQ2 5
DQ3 6
V 7
DDQ
DQi
DQ4 8
DQ5 9
V 10
SSQ
DQ6 11
DQ7 12
V 13
DDQ
LDQM 14
WE 15
CAS 16
RAS 17
CS 18
BA 19
A10/AP 20
A0 21
A1 22
A2 23
A3 24
V 25
DD
50 V
SS
49 DQ15
48 DQ14
47 V
SSQ
46 DQ13
45 DQ12
44 V
DDQ
43 DQ11
42 DQ10
41 V
SSQ
40 DQ9
39 DQ5
38 V
DDQ
37 N.C/RFU
36 UDQM
35 CLK
34 CKL
33 N.C
32 A9
31 A8
30 A7
29 A6
28 A5
27 A4
26 V
SS