--- /dev/null
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 2
+Title "ROM development board"
+Date "2020-05-18"
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+Comment3 "License: Creative Commons Attribution Share-Alike (CC BY-SA)"
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+F 3 "" H 4900 3300 50 0001 C CNN
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+Wire Wire Line
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+$Comp
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+F 3 "" H 3200 6550 50 0001 C CNN
+ 1 3200 6550
+ -1 0 0 -1
+$EndComp
+Wire Wire Line
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+Connection ~ 3400 6650
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+$Comp
+L Device:C C5
+U 1 1 608712E4
+P 7000 950
+F 0 "C5" H 6950 1150 50 0000 L CNN
+F 1 "0.1uF" H 6900 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7038 800 50 0001 C CNN
+F 3 "~" H 7000 950 50 0001 C CNN
+ 1 7000 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C6
+U 1 1 6087551A
+P 7250 950
+F 0 "C6" H 7200 1150 50 0000 L CNN
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+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7288 800 50 0001 C CNN
+F 3 "~" H 7250 950 50 0001 C CNN
+ 1 7250 950
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+$EndComp
+$Comp
+L Device:C C7
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+P 7500 950
+F 0 "C7" H 7450 1150 50 0000 L CNN
+F 1 "0.1uF" H 7400 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7538 800 50 0001 C CNN
+F 3 "~" H 7500 950 50 0001 C CNN
+ 1 7500 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C8
+U 1 1 6087734E
+P 7750 950
+F 0 "C8" H 7700 1150 50 0000 L CNN
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+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 7788 800 50 0001 C CNN
+F 3 "~" H 7750 950 50 0001 C CNN
+ 1 7750 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C9
+U 1 1 608775E5
+P 8000 950
+F 0 "C9" H 7950 1150 50 0000 L CNN
+F 1 "0.1uF" H 7900 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8038 800 50 0001 C CNN
+F 3 "~" H 8000 950 50 0001 C CNN
+ 1 8000 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C10
+U 1 1 60877E21
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+F 0 "C10" H 8200 1150 50 0000 L CNN
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+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8288 800 50 0001 C CNN
+F 3 "~" H 8250 950 50 0001 C CNN
+ 1 8250 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C11
+U 1 1 6087803A
+P 8500 950
+F 0 "C11" H 8450 1150 50 0000 L CNN
+F 1 "0.1uF" H 8400 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8538 800 50 0001 C CNN
+F 3 "~" H 8500 950 50 0001 C CNN
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+$EndComp
+$Comp
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+F 0 "C12" H 8700 1150 50 0000 L CNN
+F 1 "0.1uF" H 8650 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 8788 800 50 0001 C CNN
+F 3 "~" H 8750 950 50 0001 C CNN
+ 1 8750 950
+ 1 0 0 -1
+$EndComp
+$Comp
+L Device:C C13
+U 1 1 60893FC1
+P 9000 950
+F 0 "C13" H 8950 1150 50 0000 L CNN
+F 1 "0.1uF" H 8900 750 50 0000 L CNN
+F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 9038 800 50 0001 C CNN
+F 3 "~" H 9000 950 50 0001 C CNN
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+$EndComp
+$Comp
+L power:GND #PWR025
+U 1 1 60895593
+P 6850 1100
+F 0 "#PWR025" H 6850 850 50 0001 C CNN
+F 1 "GND" H 6850 950 50 0000 C CNN
+F 2 "" H 6850 1100 50 0001 C CNN
+F 3 "" H 6850 1100 50 0001 C CNN
+ 1 6850 1100
+ -1 0 0 -1
+$EndComp
+$Comp
+L power:VCC #PWR024
+U 1 1 6089701F
+P 6850 800
+F 0 "#PWR024" H 6850 650 50 0001 C CNN
+F 1 "VCC" H 6850 950 50 0000 C CNN
+F 2 "" H 6850 800 50 0001 C CNN
+F 3 "" H 6850 800 50 0001 C CNN
+ 1 6850 800
+ -1 0 0 -1
+$EndComp
+Wire Wire Line
+ 6850 800 7000 800
+Connection ~ 7000 800
+Wire Wire Line
+ 7000 800 7250 800
+Connection ~ 7250 800
+Wire Wire Line
+ 7250 800 7500 800
+Connection ~ 7500 800
+Wire Wire Line
+ 7500 800 7750 800
+Connection ~ 7750 800
+Wire Wire Line
+ 7750 800 8000 800
+Connection ~ 8000 800
+Wire Wire Line
+ 8000 800 8250 800
+Connection ~ 8250 800
+Wire Wire Line
+ 8250 800 8500 800
+Connection ~ 8500 800
+Wire Wire Line
+ 8500 800 8750 800
+Connection ~ 8750 800
+Wire Wire Line
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+Wire Wire Line
+ 6850 1100 7000 1100
+Connection ~ 7000 1100
+Wire Wire Line
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+Connection ~ 7250 1100
+Wire Wire Line
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+Connection ~ 7500 1100
+Wire Wire Line
+ 7500 1100 7750 1100
+Connection ~ 7750 1100
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+Connection ~ 8000 1100
+Wire Wire Line
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+Connection ~ 8250 1100
+Wire Wire Line
+ 8250 1100 8500 1100
+Connection ~ 8500 1100
+Wire Wire Line
+ 8500 1100 8750 1100
+Connection ~ 8750 1100
+Wire Wire Line
+ 8750 1100 9000 1100
+Text Notes 7750 650 0 50 ~ 0
+bypass capacitors
+NoConn ~ 1900 5300
+Text Label 2800 3050 0 50 ~ 0
+~SYSRST
+$Comp
+L Connector:Conn_01x01_Male J7
+U 1 1 60C37FAA
+P 3150 2750
+F 0 "J7" V 3100 2700 50 0000 L CNN
+F 1 "SYSRST" H 3150 2800 50 0000 L CNN
+F 2 "Connector_PinSocket_2.54mm:PinSocket_1x01_P2.54mm_Vertical" H 3150 2750 50 0001 C CNN
+F 3 "~" H 3150 2750 50 0001 C CNN
+ 1 3150 2750
+ 0 1 1 0
+$EndComp
+Wire Wire Line
+ 3150 3050 3150 2950
+Wire Wire Line
+ 2800 3050 3150 3050
+$Comp
+L Device:R R3
+U 1 1 60D2872F
+P 7200 5000
+F 0 "R3" V 7200 4750 50 0000 C CNN
+F 1 "4K7" V 7200 5000 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5000 50 0001 C CNN
+F 3 "~" H 7200 5000 50 0001 C CNN
+ 1 7200 5000
+ 0 -1 1 0
+$EndComp
+Wire Wire Line
+ 6250 6450 6050 6450
+Wire Wire Line
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+Wire Wire Line
+ 6400 6250 6400 6850
+Entry Wire Line
+ 6650 4900 6750 5000
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+ 6750 5000 7050 5000
+Wire Wire Line
+ 6750 5100 7050 5100
+Wire Wire Line
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+Wire Wire Line
+ 6750 5300 7050 5300
+Text Label 6750 5000 0 50 ~ 0
+SYSA11
+Text Label 6750 5100 0 50 ~ 0
+SYSA12
+Text Label 6750 5200 0 50 ~ 0
+SYSA13
+Text Label 6750 5300 0 50 ~ 0
+SYSA14
+$Comp
+L Device:R R4
+U 1 1 60E87D8E
+P 7200 5100
+F 0 "R4" V 7200 4850 50 0000 C CNN
+F 1 "4K7" V 7200 5100 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5100 50 0001 C CNN
+F 3 "~" H 7200 5100 50 0001 C CNN
+ 1 7200 5100
+ 0 -1 1 0
+$EndComp
+$Comp
+L Device:R R5
+U 1 1 60E87FB4
+P 7200 5200
+F 0 "R5" V 7200 4950 50 0000 C CNN
+F 1 "4K7" V 7200 5200 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5200 50 0001 C CNN
+F 3 "~" H 7200 5200 50 0001 C CNN
+ 1 7200 5200
+ 0 -1 1 0
+$EndComp
+$Comp
+L Device:R R6
+U 1 1 60E8815F
+P 7200 5300
+F 0 "R6" V 7200 5050 50 0000 C CNN
+F 1 "4K7" V 7200 5300 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 7130 5300 50 0001 C CNN
+F 3 "~" H 7200 5300 50 0001 C CNN
+ 1 7200 5300
+ 0 -1 1 0
+$EndComp
+$Comp
+L power:GND #PWR031
+U 1 1 60E8A6A5
+P 7350 5350
+F 0 "#PWR031" H 7350 5100 50 0001 C CNN
+F 1 "GND" H 7350 5200 50 0000 C CNN
+F 2 "" H 7350 5350 50 0001 C CNN
+F 3 "" H 7350 5350 50 0001 C CNN
+ 1 7350 5350
+ -1 0 0 -1
+$EndComp
+Wire Wire Line
+ 7350 5350 7350 5300
+Connection ~ 7350 5100
+Wire Wire Line
+ 7350 5100 7350 5000
+Connection ~ 7350 5200
+Wire Wire Line
+ 7350 5200 7350 5100
+Connection ~ 7350 5300
+Wire Wire Line
+ 7350 5300 7350 5200
+NoConn ~ 2800 2950
+Connection ~ 3500 3350
+Wire Wire Line
+ 3500 3450 3500 3350
+Wire Wire Line
+ 3650 3450 3500 3450
+Wire Wire Line
+ 3500 1750 3500 1950
+Wire Wire Line
+ 3500 1650 3500 1750
+Connection ~ 3500 1750
+Wire Wire Line
+ 3650 1750 3500 1750
+Text Notes 1250 1200 0 50 ~ 0
+Note: firmware drives ~SS~ high when not in\nprogramming mode (PGM low) to avoid contention\nwhen the system drives the address bus.
+$Comp
+L Device:R R7
+U 1 1 60FC7770
+P 3350 2950
+F 0 "R7" H 3400 3100 50 0000 C CNN
+F 1 "4K7" V 3350 2950 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 3280 2950 50 0001 C CNN
+F 3 "~" H 3350 2950 50 0001 C CNN
+ 1 3350 2950
+ 1 0 0 1
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+ 2800 3150 3350 3150
+$Comp
+L power:VCC #PWR032
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+F 2 "" H 3350 2800 50 0001 C CNN
+F 3 "" H 3350 2800 50 0001 C CNN
+ 1 3350 2800
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+$EndComp
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
+ 3350 3450 3350 5200
+Wire Wire Line
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+Wire Wire Line
+ 6300 4850 6300 4750
+Connection ~ 6300 4750
+Wire Wire Line
+ 6050 6550 6050 6450
+Connection ~ 6050 6450
+Wire Wire Line
+ 6700 3050 6700 2950
+$Comp
+L Diode:1N4148 D3
+U 1 1 5F8C7D7E
+P 6250 3300
+F 0 "D3" V 6350 3150 50 0000 L CNN
+F 1 "1N4148" H 6000 3200 50 0000 L CNN
+F 2 "Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 6250 3125 50 0001 C CNN
+F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 6250 3300 50 0001 C CNN
+ 1 6250 3300
+ 0 1 1 0
+$EndComp
+$Comp
+L Diode:1N4148 D4
+U 1 1 5F89552F
+P 6450 3300
+F 0 "D4" V 6550 3300 50 0000 L CNN
+F 1 "1N4148" H 6200 3200 50 0000 L CNN
+F 2 "Diode_SMD:D_0805_2012Metric_Pad1.15x1.40mm_HandSolder" H 6450 3125 50 0001 C CNN
+F 3 "https://assets.nexperia.com/documents/data-sheet/1N4148_1N4448.pdf" H 6450 3300 50 0001 C CNN
+ 1 6450 3300
+ 0 1 1 0
+$EndComp
+Connection ~ 6700 3050
+Text Label 6550 3550 0 50 ~ 0
+~SYSCS
+Text Label 6550 3650 0 50 ~ 0
+~SYSOE
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+Wire Wire Line
+ 6450 3550 6450 3450
+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+Wire Wire Line
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+$Comp
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+U 1 1 5FB4A123
+P 6950 3350
+F 0 "R8" V 7050 3350 50 0000 C CNN
+F 1 "4K7" V 6950 3350 50 0000 C CNN
+F 2 "Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder" V 6880 3350 50 0001 C CNN
+F 3 "~" H 6950 3350 50 0001 C CNN
+ 1 6950 3350
+ 0 -1 1 0
+$EndComp
+Wire Wire Line
+ 6800 3350 6700 3350
+Wire Wire Line
+ 7100 3350 7200 3350
+Wire Bus Line
+ 8100 1500 8100 2650
+Wire Bus Line
+ 3250 650 3250 4250
+Wire Bus Line
+ 6400 650 6400 2650
+Wire Bus Line
+ 10350 1500 10350 4900
+Wire Bus Line
+ 6650 3950 6650 6450
+Wire Bus Line
+ 8650 2100 8650 6450
+Wire Bus Line
+ 4750 1250 4750 6150
+Connection ~ 7200 3350
+$EndSCHEMATC
projects / romdev / blobdiff