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Using the STK501 Top Module
Figure 2-8. Connecting JTAG ICE to the STK501
2.5
External SRAM
The STK501 contains a footprint where an external SRAM device can be mounted.
Make sure the SRAM device has the same voltage range as the rest of the design.
Caution: Special care should be taken if a low voltage SRAM is used, since High-volt-
age Programming requires a programming voltage higher than 4.5V. Low-voltage
SRAM may be damaged if High-voltage Programming of the target AVR is done.
Table 2-1 shows a list of recommended SRAM devices, and typical range of operation.
It is important that the SRAM device is soldered with the correct orientation as shown in
Figure 2-9.
Note:
The SRAM is disabled by default. To enable SRAM support, put a jumper
between the SRAMEN and GND pin on the PORTG/AUX connector.
Figure 2-9. Pin1 on SRAM Footprint and Pinout
A0
A1
A2
A3
CS
D0
D1
1
2
3
4
5
6
7
32
31
30
29
28
27
26
A16
A15
A14
A13
OE
D7
D6
VCC
GND
D2
D3
WE
A4
A5
A6
A7
8
9
10
11
12
13
14
15
16
128Kx8
25
24
23
22
21
20
19
18
17
GND
VCC
D5
D4
A12
A11
A10
A9
A8
2-6
AVR ? STK501 User Guide
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