Pioneer AVIC-X940BT, Service Manual

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AVIC-X940BT/XNUC
58
1 2 3 4
1 2 3 4
C
D
F
A
B
E
Check 6: Is SDRAM I/F OK?
<Outline> In order to secure the MPEG stream data as the buffer,
the capacity of communication I/F SDRAM between the LSI and the memory is 64Mbit.
Be careful as XCSM, XWE, XCAS and XRAS of IC1480 are called differently in IC1501,
namely NCSM, NWE, NCAS, NRAS.
MA0 - 11
MDQ0 - 15
MCK
XWE(NWE)
XCAS(NCAS)
XRAS(NRAS)
XCSM(NCSM)
DQM0
DQM1
BA0
BA1
Fig 6.1: SDRAM I/F
<Check> Check the conductivity at “check point 1” and “check point 2” without power.
In case of NG, check the soldering and defective components throughout the
“output
t
input” of the applicable section.
No. Signal name Check point 1 Check point 2 Specification value
1 MA0 IC1480 23pin IC1501 201pin 56 ohm ± 5%
2 MA1 IC1480 24pin IC1501 203pin 56 ohm ± 5%
3 MA2 IC1480 25pin IC1501 207pin 56 ohm ± 5%
4 MA3 IC1480 26pin IC1501 209pin 56 ohm ± 5%
5 MA4 IC1480 29pin IC1501 208pin 56 ohm ± 5%
6 MA5 IC1480 30pin IC1501 206pin 56 ohm ± 5%
7 MA6 IC1480 31pin IC1501 202pin 56 ohm ± 5%
8 MA7 IC1480 32pin IC1501 200pin 56 ohm ± 5%
9 MA8 IC1480 33pin IC1501 198pin 56 ohm ± 5%
10 MA9 IC1480 34pin IC1501 194pin 56 ohm ± 5%
11 MA10 IC1480 22pin IC1501 199pin 56 ohm ± 5%
12 MA11 IC1480 35pin IC1501 192pin 56 ohm ± 5%
13 MDQ0 IC1480 2pin IC1501 160pin 56 ohm ± 5%
14 MDQ1 IC1480 4pin IC1501 162pin 56 ohm ± 5%
15 MDQ2 IC1480 5pin IC1501 164pin 56 ohm ± 5%
16 MDQ3 IC1480 7pin IC1501 168pin 56 ohm ± 5%
17 MDQ4 IC1480 8pin IC1501 170pin 56 ohm ± 5%
18 MDQ5 IC1480 10pin IC1501 172pin 56 ohm ± 5%
19 MDQ6 IC1480 11pin IC1501 176pin 56 ohm ± 5%
20 MDQ7 IC1480 13pin IC1501 178pin 56 ohm ± 5%
21 MDQ8 IC1480 42pin IC1501 177pin 56 ohm ± 5%
22 MDQ9 IC1480 44pin IC1501 175pin 56 ohm ± 5%
23 MDQ10 IC1480 45pin IC1501 171pin 56 ohm ± 5%
24 MDQ11 IC1480 47pin IC1501 169pin 56 ohm ± 5%
25 MDQ12 IC1480 48pin IC1501 167pin 56 ohm ± 5%
26 MDQ13 IC1480 50pin IC1501 163pin 56 ohm ± 5%
27 MDQ14 IC1480 51pin IC1501 161pin 56 ohm ± 5%
28 MDQ15 IC1480 53pin IC1501 159pin 56 ohm ± 5%
29 MCK IC1480 38pin IC1501 183pin 47 ohm ± 5%
30 XWE IC1480 16pin IC1501 181pin 56 ohm ± 5%
31 XCAS IC1480 17pin IC1501 188pin 56 ohm ± 5%
32 XRAS IC1480 18pin IC1501 189pin 56 ohm ± 5%
33 XCSM IC1480 19pin IC1501 190pin 56 ohm ± 5%
34 DQM0 IC1480 15pin IC1501 179pin 56 ohm ± 5%
35 DQM1 IC1480 39pin IC1501 180pin 56 ohm ± 5%
36 BA0 IC1480 20pin IC1501 193pin 56 ohm ± 5%
IC1480 21pin IC1501 197pin
IC1480
SDRAM
IC1501
DV5
37 BA1
56 ohm ± 5%