Y1
PORT1= J1x
PORT2= J2x
PORT3= J3xC1
PORT4= J4x
R1
U1 74LS74
J1A |
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J1B |
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J2A |
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J2B |
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J3A |
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| * JxA= INT MODE SELECT * | * JxC= CLOCK DIV SELECT * |
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| DIV1= CLOCK DIVIDE BY 1 |
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| M= SHARED WITH RESISTOR | DIV4= CLOCK DIVIDE BY 4 |
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| C2 | * JxB= INT SELECT * |
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| U2 | C4 | U4 | C7 |
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| J1C |
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| J2D | AT RT NE |
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DIV1 | DIV2 | DIV4 | 16550 PORT1 |
| 16550 PORT2 |
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| J2C |
| U5 74HC125 |
| A9 | A8 | A7 | A6 | A5 | S3 | S2 | S1 | J3D |
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DIV1 | DIV2 | DIV4 | U3 | U6 | U8 |
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| J3C |
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| AT RT NE |
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U11 | 74HC04 | |
RP3 |
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U12 | 75175 | |
R6 | C14 | |
R7 |
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U13 | 75174 | |
R8 |
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R9 | C15 | |
R10 | 75175 | |
R11U14 | ||
C16 | ||
R12 | ||
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R13 | 75174 | |
U15 |
* JxE JUMPER SETTINGS *
P= PULL UP/DOWN ENABLE T= TERMINATION ENABLE L= CONNECT RX TO TX
J1E
R14 |
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R15 |
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J3B |
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3 | 4 | 5 | 6 | 7 | 9 10 11 12 15 | |
J4A |
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J4B |
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3 | 4 | 5 | 6 | 7 | 9 10 11 12 15 | |
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| * JxD JUMPER SETTINGS * |
| RS422= REMOVE ALL JUMPERS |
DIV1 DIV2 DIV4 | |
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J4C |
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DIV1 DIV2 DIV4 | 16550 PORT3 | 16550 PORT4 | 74LS244 | 74LS245 | |
C11 |
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| P2 |
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R17 | P | 318 | |
T | |||
L | |||
| - | ||
| L | SD837M | |
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BoardLayout.Figure
30