1. CprE 211 Break-out Board Layout
Address Bus (A23-A0) #1
A5-A2
1 MB SRAM (#1)
1 MB SRAM (#2)
1 MB SRAM (#3)
1 MB SRAM (#4) #2
CS0* #3
CS1*
Address Demux
D31-D24
D23-D16
D15-D8
D7-D0 #4
To Enable Lines
for each Buffer
or Latch
Digital Input 1
Digital Input 2
DIP Switch 1
DIP Switch 2
Potentiometers
Input Devices
Analog 1
Analog 2
Pull-Down Resistors
Pull-Down Resistors
Optoisolator
Optoisolator
Keyboard Input
Analog 3
Analog 4
D7-D0
Octal Latch
Octal Latch
Octal Latch
Octal Latch
Octal Latch
AN0
AN1
AN2
AN3
Data Bus (D31-D0)
7-Segment Disp.
7-Segment Disp.
LED Bargraph 1
LED Bargraph 2
8-bit Output Pins
8-bit Output Pins
Output Devices
Data Strobe
Resistor Bank
Resistor Bank
LCD Display
Resistor Bank
Resistor Bank
Optoisolator
Optoisolator
7-Seg Decoder
7-Seg Decoder
External 7-Seg Display (also on board)
Octal Buffer
Octal Buffer
Octal Buffer
Octal Buffer
Octal Buffer
Octal Buffer
8-bit Input Port
D7-D0
Resistor Bank
7-Segment Disp.

3. Address Selection for External Devices
!CS2
A05
A04
5 V
5 V
Strobe
Vcc
A03
Pin 1
Pin 24 A
Inhibit
A02 B C S7 D S6
S10
Device 10 Enable S5
S11
Device 11 Enable S4
74HC4514 S8
Device 8 Enable S3 S9
Device 9 Enable S1
S14
Device 14 Enable S2
S15
Device 15 Enable S0
S12
Device 12 Enable
Gnd
S13
Device 13 Enable
Device 0 Enable
Device 2 Enable
Address Bus
Device 1 Enable
Device 3 Enable
Device 4 Enable
Device 5 Enable
Device 6 Enable
Device 7 Enable

4. 7 – Segment Decoder and Display
5 V
Pin 8
5 V
Output 5
D05 A1
Vcc
D06
Pin 1
Pin 16
Output 6 A2 f P0
P15
Pin 9
Pin 1
Pin 16
!LE g P1
P14
Pin 10
!RBO a P2
P13
Pin 7
DM9368N
!RBI b P3
270 W Resistor Network (8)
P12
Pin 6
D07
Output 7 A3 c P4
P11
Pin 4
D04
Output 4 A0 d P5
P10
Pin 2
Gnd e P6 P9
Pin 1 NC P7 P8 NC
5 V
Pin 8
5 V
D02
Output 2 A1
P15
D03
Pin 1
Pin 16
Output 3 A2 f P0
P15
Pin 9
Pin 1
Pin 16
!LE g P1
P14
Pin 10
!RBO a P2
P13
Pin 7
!RBI
DM9368N b P3
270 W Resistor Network (8)
P12
Pin 6
D01
Output 1 A3 c P4
P11
Pin 4
D00
Output 0 A0 d P5
P10
Pin 2
Gnd e P6 P9
Pin 1 NC P7 P8 NC

5. Octal Buffer for Output Devices
Device x Enable Line from Address Selection
5 V
!OE1
Vcc D0
Pin 1
Pin 20 A1
!OE2 D1 A2 Y1
Output 0 D2 A3 Y2
Output 1 D3 A4 Y3
Output 2 D4
SN74AHCT541 A5 Y4
Output 3 D5 A6 Y5
Output 4 D6 A7 Y6
Output 5 D7 A8 Y7
Output 6
Gnd Y8
Output 7
Data Bus

6. Octal Latch for Input Devices
!OE
Vcc
Pin 1
Pin 20 D0
Input 0 D0 O0
Input 1 D1 O1 D1 D2 O2 D2
Input 2 D3 O3 D3
Input 3
SN74AHCT541
Input 4 D4 O4 D4 D5 O5 D5
Input 5
Input 6 D6 O6 D6 D7
Input 7 D7 O7
Gnd LE
Device x Enable Line from Address Selection
Data Bus

7. LED Bargraph Output (2 total)
5 V
Pin 1
Output 0 P0
P15
Output 1 P1
Pin 1
Pin 16
P14
Output 2 P2
P13
Output 3 P3
270 W Resistor Network (8)
P12
Output 4 P4
P11
Output 5 P5
P10
Output 6 P6 P9
Output 7 P7 P8

8. DIP Switch Input (2 total)
5 V
Gnd P0
P15
Pin 1
Pin 16 P1
P14 P2
P13 P3
10 KW Resistor Network (8)
P12 P4
P11 P5
P10 P6 P9 P7 P8
Input 0
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7

9. Data Bus (D32-D0) Address Bus (A23-A0) PB-0555 Board To Enable Lines
Pin 1
Pin 20 P0
P15 P1
P18
Pin 1
Pin 16 P1
P14 P2
P17 P2
P13 P3
P16
5 V P3
P12 P4
P15
16 Pin
20 Pin P4
P11 P5
P14 P5
P10 P6
P13 P6 P9 P7
P12 P7 P8 P8
P11 P9
P10
Data Bus (D32-D0)
PB-0555 Board
I/O Pin Header #1
To Enable Lines
for each Buffer
Or Latch
I/O Pin Header #2
PPC555 P0
P23
I/O Pin Header #4
Pin 1
Pin 24 P1
P22 P2
P21
Address Bus (A23-A0) P3
P20
I/O Pin Header #3 P4
P19
Address Selection P5
P18
24 Pin P6
P17
I/O Pin Header #1 P7
P16
I/O Pin Header #2
I/O Pin Header #4 P8
P15
I/O Pin Header #3 P9
P14
P10
P13
P11
P12