1 external interface – SENA HD1200 User Manual
Page 7
Starter Kit and User Manual for the HelloDevice 1200
4
3.1 External Interface
The HelloDevice provides JP1 and JP2 connectors that has 38 signal pins for external interface, which allows
internal components of the main board such as microprocessor, Ethernet controller and dual-port RAM to be
interfaced with the user device. Figure 3.3 and Table 3.1 represent the pin assignment for the external interface
of the HelloDevice 1200.
Figure 3.3. The HelloDevice 1200 External Interface
Pin
Symbol
Description
1~ 11
BA0 ~ BA10
Dual-Port RAM Address
12 ~ 19
BD0 ~ BD7
Dual-Port RAM Data
20 GND
Ground
21 Write
22 CE
23 Read
24 IRQ
25 Busy
Dual-Port RAM Control Signal (Write)
Dual-Port RAM Control Signal (Chip Enable)
Dual-Port RAM Control Signal (Read)
Dual-Port RAM Control Signal (IRQ)
Dual-Port RAM Control Signal (Busy)
26 Reset
Microprocessor
Reset
27 ~ 32
Not Used
33 ~ 35
LED0 ~ LED2
Ethernet Status Indicator LED (Tx, Rx, Collision)
36 Tx+
37 Tx-
38 Rx+
39 Rx-
RJ45 Connector Ethernet Data
40
Vcc
Power Supply Vcc
Table 3.1. Pin Assignment of the HelloDevice External Interface
JP1
JP2
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
GND
BD7
BD6
BD5
BD4
BD3
BD2
BD1
BD0
BA10
BA9
BA8
BA7
BA6
BA5
BA4
BA3
BA2
BA1
BA0
Write
CE
Read
IRQ
busy
Reset
Led2
Led1
Led0
Tx+
Tx-
Rx+
Rx-
Vcc