1
2
3
4
5
6
7
A
B
C
D
E
F
G
7
6
5
4
3
2
1
G
F
E
D
C
B
A
Title: Digital AV Decoder
Approved by:
Drawn by:
File Name:
Path: M:\IanS\temp\temp.ddb - Documents\SC011991.SCH
Print date:
Drawn date:
Issue:
Sheet of
2-Apr-2008
0
Huntingdon, United Kingdom.
This drawing is the intellectual property of Cyrus Electronics Ltd.
O
c
Description:
9
13
9
Sheet
CRYSTAL Decoder External Memory
1-Apr-1999
Cummins/Sells
VC
C
20
GND
10
A0
2
A1
3
A2
4
A3
5
A4
6
A5
7
A6
8
A7
9
B7
11
B6
12
B5
13
B4
14
B3
15
B2
16
B1
17
B0
18
OE
19
T/R
1
IC906
MM74LCX245WM
D1
2
Q1
19
D2
3
Q2
18
D3
4
Q3
17
D4
5
Q4
16
D5
6
Q5
15
D6
7
Q6
14
D7
8
Q7
13
D8
9
Q8
12
OE
1
CP
11
GND
10
VC
C
20
IC903
MC74HCT574ADW
External
Decoder
PROM
for Boot Code
and
DTS look-up table
dspDATA0
dspDATA1
dspDATA2
dspDATA3
dspDATA4
dspDATA5
dspDATA6
dspDATA7
F
rom De
code
r
+3.3V
GND
C907
10n
C904
47u
6.3V
L902
1.0u-FSL
C903
10n
C902
10n
L901
1.0u-FSL
C901
10n
GND
GND
dspA0
dspA1
dspA2
dspA3
dspA4
dspA5
dspA6
dspA7
dspA8
dspA9
dspA10
dspA11
dspA12
dspA13
dspA14
GND
GND
GND
+5V
dspA0
dspA1
dspA2
dspA3
dspA4
dspA5
dspA6
dspA7
dspA8
dspA9
dspA10
dspA11
dspA12
dspA13
dspA14
D1
2
Q1
19
D2
3
Q2
18
D3
4
Q3
17
D4
5
Q4
16
D5
6
Q5
15
D6
7
Q6
14
D7
8
Q7
13
D8
9
Q8
12
OE
1
CP
11
GND
10
VC
C
20
IC904
MC74HCT574ADW
GND
GND
GND
GND
+5Vprom
+5Vprom
GND
C908
10n
GND
+5Vprom
C909
10n
GND
+5Vprom
dspMEM
dspOE
GND
RP902
L09-1S 100k
GND
NOTE: 74LCXx devices are 3.3 Volt
parts with 5V tolerent inputs.
74HCTx devices have 3.3V compatible inputs
dspDATA0
dspDATA1
dspDATA2
dspDATA3
dspDATA4
dspDATA5
dspDATA6
dspDATA7
A0
12
A1
11
A2
10
A3
9
A4
8
A5
7
A6
6
A7
5
A8
27
A9
26
A10
23
A11
25
A12
4
A13
28
A14
29
A15
3
OE
24
CE
22
O0
13
O1
14
O2
15
O3
17
O4
18
O5
19
O6
20
O7
21
VC
C
32
GND
16
A16
2
XX/Vpp
1
A17
30
XX/PGM
31
IC905
32-pin PLCC socket
Fit AM27C020-90JC EPROM during assembly
+3.3Vprom
+3.3Vprom
+3.3Vprom
dspOE
pagedA15
pagedA16
pagedA17
dspA15
dspMEM
pagedA15
pagedA16
pagedA17
dspA15
2
3
14
7
1
IC902A
MM74HC125M
GND
GND
C906
10n
+5Vprom
5
6
4
IC902B
12
11
13
IC902C
9
8
10
IC902D
DATA
2
VDD
16
GND
8
EN
15
Q1
5
Q2
6
STR
1
CLK
3
Q
10
Q
9
Q3
7
Q4
14
Q5
13
Q6
12
Q7
11
Q0
4
IC901
74HC4094D
C905
10n
+5V
GND
GND
+5Vprom
R901
100k
GND
spi SCK
spi MOSI
RP901
CAT16-470J4
47R
Strobe dspPROM