Philips LX700/21S/22S/25S Service Manual page 32

LA1837 INTERNAL IC DIAGRAM
30 29 28 27 26 25
REG
AM AM
ALC AM
MIX RF.AMP
OSC
BUFF
AGC
AM IF DET
SD
COMP
AM
S-METER
FM AM/FM
S-CURVE
S-METER IF-BUFF
TUNING
DRIVE
FM
AM IF DET
GND
1 2 3 4 5 6
ESS4008 INTERNAL IC DIAGRAM
SRAM
Interface
G P IO
TDM
Transport
Interface
S erial A udio
Interface
8-2
24 23 22 21 20 19 18 17
3 rd 5 th
DECODER
ANTI-BIRDIE
MUTE
P-DET
STEREO
SW
VCO FF FF FF PILOT
304kHz 38K 19k 19k DET
2
STEREO
DRIVE
VCC
7 8 9 10 11 12 13 14
32-B i t
R ISC
Processor
16 K Cache
G ateway
+
D M A
C ontroller
Huffm an
DRAM
Decoder
Interface
SIM D
DSP
R O M
RAM
SYNCHRONOUS DRAM
1MX16Y3VTW
16
PIN ASSIGNMENT (Top View)
50 - Pin TSOP
V 1
DD
DQ0 2
DQ1 3
VssQ 4
DQ2 5
DQ3 6
V Q 7
DD
DQ4 8
DQ5 9
VssQ 10
DQ6 11
DQ7 12
V Q 13
DD
DQML 14
WE# 15
CAS# 16
RAS# 17
CS# 18
BA 19
A10 20
A0 21
A1 22
A2 23
A3 24
V 25
DD
15
FUNCTIONAL BLOCK DIAGRAM
1 Meg x 16 SDRAM
CKE
CLK
CS# CONTROL
LOGIC
WE#
CAS#
RAS#
MODE REGISTER
12
REFRESH
ADDRESS
CONTROLLER
A0-A10, BA 12
REGISTER
REFRESH
COUNTER
11
8-2
50 Vss
49 DQ15
48 DQ14
47 VssQ
Note: The # symbol indicates signal is active LOW.
46 DQ13
45 DQ12
44 V Q
DD
Configuration
43 DQ11
42 DQ10 Refresh Count
41 VssQ
Row Addressing
40 DQ9
Bank Addressing
39 DQ8
38 V Q
DD Column Addressing
37 NC
36 DQMH
35 CLK
34 CKE
33 NC
32 A9
31 A8
30 A7
29 A6
28 A5
27 h
26 Vss
BANK0
ROW-
MEMORY
11 ADDRESS 11
2,048
ARRAY
LATCH
(2,048 x 256 x 16)
256 (x16)
SENSE AMPLIFIERS
I/O GATING
DQM MASK LOGIC
256
COLUMN
8
8
DECODER
256
SENSE AMPLIFIERS
I/O GATING
DQM MASK LOGIC
11
ROW-
ADDRESS
256 (x16)
MUX
BANK1
ROW-
MEMORY
11 ADDRESS 11 2,048
ARRAY
LATCH
(2,048 x 256 x 16)
1 M eg x 16
512K x 16 x 2 banks
2K or 4K
2K (A0-A10)
2 (BA)
256 (A0-A7)
DQML,
DQMH
DATA
OUTPUT
16
REGISTER
DQ0-
16
DQ15
16
DATA
INPUT 8
REGISTER