below shows the Memory Expansion connections
These connections support 5 to 3.3V level translation.
JA3
Pin Generic Header Name
Signal Name
Pin
Header Name
Signal Name
1 A(0)
A(0)
2 A(1)
A(1)
3 A(2)
A(2)
4 A(3)
A(3)
5 A(4)
A(4)
6 A(5)
A(5)
7 A(6)
A(6)
8 A(7)
A(7)
9 A(8)
A(8)
10 A(9)
A(9)
11 A(10)
A(10)
12 A(11)
A(11)
13 A(12)
A(12)
14 A(13)
A(13)
15 A(14)
A(14)
16 A(15)
A(15)
17 D(0)
D(0)
18 D(1)
D(1)
19 D(2)
D(2)
20 D(3)
D(3)
21 D(4)
D(4)
22 D(5)
D(5)
23 D(6)
D(6)
24 D(7)
D(7)
25 RDn
RDn
26 WRn
WRn
27 CS1n
CS1n
28 CS2n
CS2n
29 D(8)
D(8)
30 D(9)
D(9)
31 D(10)
D(10)
32 D(11)
D(11)
33 D(12)
D(12)
34 D(13)
D(13)
35 D(14)
D(14)
36 D(15)
D(15)
37 A(16)
A(16)
38 A(17)
A(17)
39 A(18)
A(18)
40 A(19)
A(19)
41 A(20)
A(20)
42 A(21)
A(21)
43 A(22)
A(22)
44 SDCLK
SDCLK
45 CS3n
CS3n
46 ALE
ALE
47 WR1n
WR1n
48 WR0n
WR0n
49 CASn
CASn
50 RASn
RASn
Table 5-5: JA3 Memory Expansion connector
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