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5.4 Setting a External Memory Emulation
Figure 5.4-1 shows the external memory emulation block diagram, figure 5.4-2 and table 5.4-1 show the set-
ting the memory size select switch and the factory settings of the memory size select switch, figure 5.4-3
shows the factory settings of the setting the memory connective switches; Table 5.4-2 lists the memory con-
nective switch settings.
External Memory Emulation Block Diagram
Figure 5.4-1 shows the external memory emulation block diagram.
Setting the Memory Size Select Switch
The memory size select switch select the size of the memory board to be connected to use the exter-
nal memory emulation function.
Figure 5.4-2 shows the factory settings of the switch; Table 5.4-1 lists the memory board sizes and
effective addresses depending on the settings of the switch.
ASEL3
All manuals and user guides at all-guides.com
Address bus
P4[5:0],P3[7:0],P2[7:1],P5[4]
Evaluation
Data bus
MCU
P1[7:0],P0[7:0]
74LVCH16244A
External-
Y
A
memory
*OE
emulation
circuit
Adapter board
Figure 5.4-1 External Memory Emulation Block Diagram
Figure 5.4-2 Setting the Memory Size Select Switch (Factory Setting)
Table 5.4-1 The Memory Size Select Switch Settings
ASEL2
1
1
1
1
1
0
1
0
0
1
0
1
0
0
0
0
Memory
connective
switches
GND
ASEL
SW1
1
2
3
ASEL1
Memory board size
1
2 MWords
0
1
1 MWords
0
512 KWords
1
256 KWords
0
128 KWords
1
64 KWords
0
32 KWords
Chapter 5 Usage
To header
Affective addresses
A[21:1]
A[20:1]
A[19:1]
A[18:1]
A[17:1]
A[16:1]
A[15:1]
31
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