bus-arbitration.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 13 16
Title "Wugo PCII System Board"
Date ""
Rev "1.0"
Comp ""
Comment1 "Schematics Copyright (c) 2020 David J. Fiddes <D.J@fiddes.net>"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L 74xx:74LS00 IC?
U 3 1 5EE5F6C7
P 5750 2150
AR Path="/5EC54617/5EE5F6C7" Ref="IC?"  Part="3" 
AR Path="/5EE4AF7F/5EE5F6C7" Ref="IC70"  Part="3" 
F 0 "IC70" H 5750 1833 50  0000 C CNN
F 1 "74S00" H 5750 1924 50  0000 C CNN
F 2 "" H 5750 2150 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 5750 2150 50  0001 C CNN
	3    5750 2150
	1    0    0    1   
$EndComp
$Comp
L 74xx:74LS175 IC?
U 1 1 5EE5F6CD
P 4200 2450
AR Path="/5EC54617/5EE5F6CD" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F6CD" Ref="IC87"  Part="1" 
F 0 "IC87" H 3950 3050 50  0000 C CNN
F 1 "74LS175" H 4450 3050 50  0000 C CNN
F 2 "" H 4200 2450 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS175" H 4200 2450 50  0001 C CNN
	1    4200 2450
	1    0    0    -1  
$EndComp
Wire Wire Line
	4700 2050 4900 2050
Wire Wire Line
	4900 2050 4900 1650
Wire Wire Line
	4900 1400 3400 1400
Wire Wire Line
	3400 1400 3400 2250
Wire Wire Line
	3400 2250 3700 2250
Connection ~ 4900 2050
Wire Wire Line
	4700 2250 5450 2250
Wire Wire Line
	4900 2050 5450 2050
$Comp
L 74xx:74LS74 IC?
U 2 1 5EE5F6DB
P 3350 5050
AR Path="/5EC54617/5EE5F6DB" Ref="IC?"  Part="2" 
AR Path="/5EE4AF7F/5EE5F6DB" Ref="IC86"  Part="2" 
F 0 "IC86" H 3550 5300 50  0000 C CNN
F 1 "74LS74" H 3550 4750 50  0000 C CNN
F 2 "" H 3350 5050 50  0001 C CNN
F 3 "74xx/74hc_hct74.pdf" H 3350 5050 50  0001 C CNN
	2    3350 5050
	1    0    0    -1  
$EndComp
Wire Wire Line
	3350 5400 3350 5350
Wire Wire Line
	3150 2850 3700 2850
Text GLabel 5100 2350 2    50   Output ~ 0
~WAIT~
Wire Wire Line
	5100 2350 4700 2350
Wire Wire Line
	3350 2450 3700 2450
Text GLabel 2800 1550 2    50   Output ~ 0
DMA_HLDA
$Comp
L 74xx:74LS74 IC?
U 1 1 5EE5F6EB
P 2000 2350
AR Path="/5EC54617/5EE5F6EB" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F6EB" Ref="IC86"  Part="1" 
F 0 "IC86" H 2000 2831 50  0000 C CNN
F 1 "74LS74" H 2000 2740 50  0000 C CNN
F 2 "" H 2000 2350 50  0001 C CNN
F 3 "74xx/74hc_hct74.pdf" H 2000 2350 50  0001 C CNN
	1    2000 2350
	1    0    0    -1  
$EndComp
Wire Wire Line
	2650 2050 2650 2250
Wire Wire Line
	2650 2250 2300 2250
$Comp
L 74xx:74LS20 IC?
U 1 1 5EE5F6F4
P 2050 3500
AR Path="/5EC54617/5EE5F6F4" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F6F4" Ref="IC67"  Part="1" 
F 0 "IC67" H 2050 3875 50  0000 C CNN
F 1 "74LS20" H 2050 3784 50  0000 C CNN
F 2 "" H 2050 3500 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS20" H 2050 3500 50  0001 C CNN
	1    2050 3500
	1    0    0    -1  
$EndComp
Wire Wire Line
	1200 3350 1750 3350
Wire Wire Line
	1350 3450 1750 3450
Wire Wire Line
	1200 3550 1750 3550
Wire Wire Line
	2800 1550 2650 1550
Wire Wire Line
	2650 1550 2650 2050
Connection ~ 2650 2050
Wire Wire Line
	2650 2050 3700 2050
Text GLabel 1600 3650 0    50   Input ~ 0
DMA_HRQ
Wire Wire Line
	1600 3650 1650 3650
$Comp
L 74xx:74LS04 IC?
U 2 1 5EE5F706
P 2800 3500
AR Path="/5EC54617/5EE5F706" Ref="IC?"  Part="2" 
AR Path="/5EE4AF7F/5EE5F706" Ref="IC85"  Part="2" 
F 0 "IC85" H 2800 3817 50  0000 C CNN
F 1 "74LS04" H 2800 3726 50  0000 C CNN
F 2 "" H 2800 3500 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2800 3500 50  0001 C CNN
	2    2800 3500
	1    0    0    -1  
$EndComp
Wire Wire Line
	2350 3500 2500 3500
Wire Wire Line
	3700 2650 3350 2650
Wire Wire Line
	3350 2650 3350 3500
Wire Wire Line
	3350 3500 3100 3500
$Comp
L 74xx:74LS08 IC?
U 3 1 5EE5F717
P 4750 5050
AR Path="/5EC54617/5EE5F717" Ref="IC?"  Part="3" 
AR Path="/5EE4AF7F/5EE5F717" Ref="IC88"  Part="3" 
F 0 "IC88" H 4750 5375 50  0000 C CNN
F 1 "74LS08" H 4750 5284 50  0000 C CNN
F 2 "" H 4750 5050 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 4750 5050 50  0001 C CNN
	3    4750 5050
	1    0    0    -1  
$EndComp
Wire Wire Line
	4450 4950 3650 4950
Wire Wire Line
	4700 2650 4900 2650
Wire Wire Line
	4900 2650 4900 3600
Wire Wire Line
	4900 3600 3650 3600
Wire Wire Line
	3650 3600 3650 3050
Wire Wire Line
	3650 3050 1400 3050
Wire Wire Line
	1400 3050 1400 2250
Wire Wire Line
	1400 2250 1700 2250
Wire Wire Line
	2300 2450 2450 2450
Wire Wire Line
	2450 2450 2450 2050
Wire Wire Line
	2450 2050 2000 2050
Wire Wire Line
	2000 2650 1650 2650
Wire Wire Line
	1650 2650 1650 3650
Connection ~ 1650 3650
Wire Wire Line
	1650 3650 1750 3650
Wire Wire Line
	5650 2550 4700 2550
Text GLabel 6450 2150 2    50   Output ~ 0
~DMAAEN~
NoConn ~ 4700 2450
NoConn ~ 4700 2750
Wire Wire Line
	4700 2150 5100 2150
$Comp
L power:+5V #PWR?
U 1 1 5EE5F73F
P 3350 4650
AR Path="/5EC54617/5EE5F73F" Ref="#PWR?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F73F" Ref="#PWR089"  Part="1" 
F 0 "#PWR089" H 3350 4500 50  0001 C CNN
F 1 "+5V" H 3365 4823 50  0000 C CNN
F 2 "" H 3350 4650 50  0001 C CNN
F 3 "" H 3350 4650 50  0001 C CNN
	1    3350 4650
	1    0    0    -1  
$EndComp
Wire Wire Line
	3350 4650 3350 4750
NoConn ~ 3650 5150
Wire Wire Line
	5400 5050 5050 5050
Wire Wire Line
	2850 4950 3050 4950
Wire Wire Line
	5300 1650 4900 1650
Connection ~ 4900 1650
Wire Wire Line
	4900 1650 4900 1400
$Comp
L 74xx:74LS10 IC?
U 2 1 5EE5F74F
P 7100 2700
AR Path="/5EC54617/5EE5F74F" Ref="IC?"  Part="2" 
AR Path="/5EE4AF7F/5EE5F74F" Ref="IC68"  Part="2" 
F 0 "IC68" H 7100 3025 50  0000 C CNN
F 1 "74LS10" H 7100 2934 50  0000 C CNN
F 2 "" H 7100 2700 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS10" H 7100 2700 50  0001 C CNN
	2    7100 2700
	1    0    0    -1  
$EndComp
Wire Wire Line
	6400 2800 6800 2800
$Comp
L 74xx:74LS10 IC?
U 1 1 5EE5F757
P 8200 2700
AR Path="/5EC54617/5EE5F757" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F757" Ref="IC68"  Part="1" 
F 0 "IC68" H 8200 3025 50  0000 C CNN
F 1 "74LS10" H 8200 2934 50  0000 C CNN
F 2 "" H 8200 2700 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS10" H 8200 2700 50  0001 C CNN
	1    8200 2700
	1    0    0    -1  
$EndComp
Wire Wire Line
	7900 2700 7400 2700
Wire Wire Line
	7800 2600 7900 2600
Wire Wire Line
	7800 2800 7900 2800
$Comp
L 74xx:74LS74 IC?
U 2 1 5EE5F762
P 9250 2700
AR Path="/5EC54617/5EE5F762" Ref="IC?"  Part="2" 
AR Path="/5EE4AF7F/5EE5F762" Ref="IC69"  Part="2" 
F 0 "IC69" H 9050 3000 50  0000 C CNN
F 1 "74LS74" H 9450 3000 50  0000 C CNN
F 2 "" H 9250 2700 50  0001 C CNN
F 3 "74xx/74hc_hct74.pdf" H 9250 2700 50  0001 C CNN
	2    9250 2700
	1    0    0    -1  
$EndComp
$Comp
L Device:R R?
U 1 1 5EE5F768
P 9250 1850
AR Path="/5EC54617/5EE5F768" Ref="R?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F768" Ref="R17"  Part="1" 
F 0 "R17" H 9320 1896 50  0000 L CNN
F 1 "4K7" H 9320 1805 50  0000 L CNN
F 2 "" V 9180 1850 50  0001 C CNN
F 3 "~" H 9250 1850 50  0001 C CNN
	1    9250 1850
	1    0    0    -1  
$EndComp
Wire Wire Line
	9250 2000 9250 2050
$Comp
L power:+5V #PWR?
U 1 1 5EE5F76F
P 9250 1600
AR Path="/5EC54617/5EE5F76F" Ref="#PWR?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F76F" Ref="#PWR090"  Part="1" 
F 0 "#PWR090" H 9250 1450 50  0001 C CNN
F 1 "+5V" H 9265 1773 50  0000 C CNN
F 2 "" H 9250 1600 50  0001 C CNN
F 3 "" H 9250 1600 50  0001 C CNN
	1    9250 1600
	1    0    0    -1  
$EndComp
Text GLabel 10400 2900 2    50   Output ~ 0
DMA_READY
$Comp
L 74xx:74LS08 IC?
U 4 1 5EE5F777
P 10000 2900
AR Path="/5EC54617/5EE5F777" Ref="IC?"  Part="4" 
AR Path="/5EE4AF7F/5EE5F777" Ref="IC88"  Part="4" 
F 0 "IC88" H 10000 2583 50  0000 C CNN
F 1 "74LS08" H 10000 2674 50  0000 C CNN
F 2 "" H 10000 2900 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS08" H 10000 2900 50  0001 C CNN
	4    10000 2900
	1    0    0    1   
$EndComp
Wire Wire Line
	10300 2900 10400 2900
Wire Wire Line
	9550 2800 9700 2800
Wire Wire Line
	9700 3000 9250 3000
Connection ~ 9250 3000
Wire Wire Line
	8950 2700 8500 2700
Wire Wire Line
	8950 2600 8750 2600
Wire Wire Line
	5650 3000 5650 2550
Wire Wire Line
	10000 2450 9650 2450
Wire Wire Line
	9650 2450 9650 2600
Wire Wire Line
	9650 2600 9550 2600
Text GLabel 8600 2050 0    50   Input ~ 0
IO_CH_RDY
Connection ~ 9250 2050
Text GLabel 6400 2600 0    50   Input ~ 0
~DACK0BRD~
Wire Wire Line
	6400 2600 6800 2600
$Comp
L 74xx:74LS10 IC?
U 3 1 5EE5F792
P 3950 5850
AR Path="/5EC54617/5EE5F792" Ref="IC?"  Part="3" 
AR Path="/5EE4AF7F/5EE5F792" Ref="IC68"  Part="3" 
F 0 "IC68" H 3950 6175 50  0000 C CNN
F 1 "74LS10" H 3950 6084 50  0000 C CNN
F 2 "" H 3950 5850 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS10" H 3950 5850 50  0001 C CNN
	3    3950 5850
	1    0    0    -1  
$EndComp
Wire Wire Line
	4450 5150 4250 5150
Wire Wire Line
	3650 5750 3100 5750
$Comp
L 74xx:74LS00 IC?
U 2 1 5EE5F7A1
P 3950 6500
AR Path="/5EC54617/5EE5F7A1" Ref="IC?"  Part="2" 
AR Path="/5EE4AF7F/5EE5F7A1" Ref="IC84"  Part="2" 
F 0 "IC84" H 3950 6825 50  0000 C CNN
F 1 "74LS00" H 3950 6734 50  0000 C CNN
F 2 "" H 3950 6500 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 3950 6500 50  0001 C CNN
	2    3950 6500
	1    0    0    -1  
$EndComp
Wire Wire Line
	1500 6600 2300 6600
Wire Wire Line
	4250 6500 4250 6850
Wire Wire Line
	4250 6850 3550 6850
Wire Wire Line
	3550 6850 3550 7000
Wire Wire Line
	3550 7000 3650 7000
Connection ~ 4250 6500
Wire Wire Line
	4250 7100 4450 7100
Wire Wire Line
	4450 7100 4450 6750
Wire Wire Line
	4450 6750 3550 6750
Wire Wire Line
	3550 6750 3550 6400
Wire Wire Line
	3550 6400 3650 6400
Wire Wire Line
	4250 6500 5100 6500
$Comp
L 74xx:74LS04 IC?
U 3 1 5EE5F7BC
P 2800 7200
AR Path="/5EC54617/5EE5F7BC" Ref="IC?"  Part="3" 
AR Path="/5EE4AF7F/5EE5F7BC" Ref="IC85"  Part="3" 
F 0 "IC85" H 2800 7517 50  0000 C CNN
F 1 "74LS04" H 2800 7426 50  0000 C CNN
F 2 "" H 2800 7200 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS04" H 2800 7200 50  0001 C CNN
	3    2800 7200
	1    0    0    -1  
$EndComp
Wire Wire Line
	3100 7200 3650 7200
Wire Wire Line
	1500 7200 2500 7200
Wire Wire Line
	3650 5950 3550 5950
$Comp
L 74xx:74LS00 IC?
U 4 1 5EE5F7C8
P 2250 5850
AR Path="/5EC54617/5EE5F7C8" Ref="IC?"  Part="4" 
AR Path="/5EE4AF7F/5EE5F7C8" Ref="IC70"  Part="4" 
F 0 "IC70" H 2250 5533 50  0000 C CNN
F 1 "74S00" H 2250 5624 50  0000 C CNN
F 2 "" H 2250 5850 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 2250 5850 50  0001 C CNN
	4    2250 5850
	1    0    0    1   
$EndComp
Wire Wire Line
	3650 5850 2550 5850
Wire Wire Line
	1500 5950 1950 5950
Wire Wire Line
	1500 5750 1950 5750
Wire Wire Line
	6800 2700 6750 2700
$Comp
L 74xx:74LS27 IC?
U 1 1 5EE5F7DE
P 1500 1400
AR Path="/5EC54617/5EE5F7DE" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F7DE" Ref="IC29"  Part="1" 
F 0 "IC29" H 1500 1725 50  0000 C CNN
F 1 "74LS27" H 1500 1634 50  0000 C CNN
F 2 "" H 1500 1400 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74LS27" H 1500 1400 50  0001 C CNN
	1    1500 1400
	1    0    0    -1  
$EndComp
Wire Wire Line
	1050 1300 1200 1300
$Comp
L power:GND #PWR?
U 1 1 5EE5F7E6
P 700 1400
AR Path="/5EC54617/5EE5F7E6" Ref="#PWR?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F7E6" Ref="#PWR088"  Part="1" 
F 0 "#PWR088" H 700 1150 50  0001 C CNN
F 1 "GND" H 705 1227 50  0000 C CNN
F 2 "" H 700 1400 50  0001 C CNN
F 3 "" H 700 1400 50  0001 C CNN
	1    700  1400
	1    0    0    -1  
$EndComp
Wire Wire Line
	1200 1400 700  1400
Wire Wire Line
	1200 1400 1200 1500
Connection ~ 1200 1400
Wire Wire Line
	1800 1400 1800 1850
Wire Wire Line
	1150 2350 1700 2350
Wire Wire Line
	6050 2150 6450 2150
Wire Wire Line
	1900 5400 3350 5400
Wire Wire Line
	2750 2950 3700 2950
$Comp
L 74xx:74LS00 IC?
U 1 1 5EE5F7A9
P 3950 7100
AR Path="/5EC54617/5EE5F7A9" Ref="IC?"  Part="1" 
AR Path="/5EE4AF7F/5EE5F7A9" Ref="IC84"  Part="1" 
F 0 "IC84" H 3950 7450 50  0000 C CNN
F 1 "74LS00" H 3950 7350 50  0000 C CNN
F 2 "" H 3950 7100 50  0001 C CNN
F 3 "http://www.ti.com/lit/gpn/sn74ls00" H 3950 7100 50  0001 C CNN
	1    3950 7100
	1    0    0    1   
$EndComp
Text GLabel 1900 5400 0    50   Input ~ 0
~BUF_RESET~
Text GLabel 1500 7200 0    50   Input ~ 0
ENABLE_IO_CH_CK
Wire Wire Line
	3550 6400 3550 5950
Connection ~ 3550 6400
Text GLabel 1500 6600 0    50   Input ~ 0
~IO_CH_CK~
Wire Wire Line
	4250 5850 4250 5150
Text GLabel 3100 5750 0    50   Input ~ 0
~PCK~
Text GLabel 5100 6500 2    50   Output ~ 0
IO_CH_CK
Text GLabel 5400 5050 2    50   Output ~ 0
~NMI~
Text GLabel 1500 5750 0    50   Input ~ 0
FPU_INSTALLED
Text GLabel 1500 5950 0    50   Input ~ 0
~FPU_INT~
Text GLabel 2650 5050 0    50   Input ~ 0
~NMI_ENABLE_CS~
Wire Notes Line
	5750 7600 5750 4300
Wire Notes Line
	5750 4300 600  4300
Wire Notes Line
	600  4300 600  7600
Wire Notes Line
	600  7600 5750 7600
Text Notes 700  4450 0    50   ~ 0
NMI generation
Text GLabel 6400 2800 0    50   Input ~ 0
AENBRD
Wire Wire Line
	8600 2050 9250 2050
Text GLabel 5300 1650 2    50   Output ~ 0
AENBRD
Text GLabel 5100 2150 2    50   Output ~ 0
~AEN~
Text GLabel 2750 2950 0    50   Input ~ 0
~BUF_RESET~
Text GLabel 3150 2850 0    50   Input ~ 0
CLK
Text Label 3350 2450 0    50   ~ 0
~RDY~_WAIT
Text GLabel 1050 1300 0    50   Input ~ 0
CLK
Wire Wire Line
	1800 1850 1150 1850
Wire Wire Line
	1150 1850 1150 2350
Text GLabel 1200 3350 0    50   Input ~ 0
~LOCK~
Text GLabel 1350 3450 0    50   Input ~ 0
~S1~
Text GLabel 1200 3550 0    50   Input ~ 0
~S0~
$Comp
L power:GND #PWR0139
U 1 1 5F15D3F0
P 4200 3300
F 0 "#PWR0139" H 4200 3050 50  0001 C CNN
F 1 "GND" H 4205 3127 50  0000 C CNN
F 2 "" H 4200 3300 50  0001 C CNN
F 3 "" H 4200 3300 50  0001 C CNN
	1    4200 3300
	1    0    0    -1  
$EndComp
Wire Wire Line
	4200 3250 4200 3300
$Comp
L power:+5V #PWR0138
U 1 1 5F16467C
P 4200 1700
F 0 "#PWR0138" H 4200 1550 50  0001 C CNN
F 1 "+5V" H 4215 1873 50  0000 C CNN
F 2 "" H 4200 1700 50  0001 C CNN
F 3 "" H 4200 1700 50  0001 C CNN
	1    4200 1700
	1    0    0    -1  
$EndComp
Wire Wire Line
	4200 1700 4200 1750
Wire Wire Line
	9250 1600 9250 1700
$Comp
L power:+5V #PWR?
U 1 1 5F1847A6
P 8750 2600
AR Path="/5EC54617/5F1847A6" Ref="#PWR?"  Part="1" 
AR Path="/5EE4AF7F/5F1847A6" Ref="#PWR0140"  Part="1" 
F 0 "#PWR0140" H 8750 2450 50  0001 C CNN
F 1 "+5V" H 8765 2773 50  0000 C CNN
F 2 "" H 8750 2600 50  0001 C CNN
F 3 "" H 8750 2600 50  0001 C CNN
	1    8750 2600
	1    0    0    -1  
$EndComp
Wire Wire Line
	5650 3000 9250 3000
Wire Wire Line
	9250 2050 9250 2400
Wire Notes Line
	11050 650  11050 4050
Wire Notes Line
	11050 4050 600  4050
Wire Notes Line
	600  4050 600  650 
Wire Notes Line
	600  650  11050 650 
Text Notes 650  800  0    50   ~ 0
Bus Arbitration
Text GLabel 7800 2600 0    50   Input ~ 0
~XIOW~
Text GLabel 7800 2800 0    50   Input ~ 0
~XIOR~
Text GLabel 6750 2700 0    50   Input ~ 0
XMEMR
$Comp
L Device:R_Network08_Split RP?
U 8 1 614D1593
P 2450 6450
AR Path="/5EC54617/614D1593" Ref="RP?"  Part="1" 
AR Path="/5EC58627/614D1593" Ref="RP?"  Part="5" 
AR Path="/5EE4AF7F/614D1593" Ref="RP5"  Part="8" 
F 0 "RP5" V 2418 6628 50  0000 L CNN
F 1 "4K7" V 2509 6628 50  0000 L CNN
F 2 "Resistor_THT:R_Array_SIP9" V 2370 6450 50  0001 C CNN
F 3 "http://www.vishay.com/docs/31509/csc.pdf" H 2450 6450 50  0001 C CNN
	8    2450 6450
	0    1    1    0   
$EndComp
Wire Wire Line
	2300 6450 2300 6600
Connection ~ 2300 6600
Wire Wire Line
	2300 6600 3650 6600
Text Notes 3050 6350 2    50   ~ 0
Shared pull-up to +5V
Wire Wire Line
	2650 5050 3050 5050
Text GLabel 10000 2450 2    50   Output ~ 0
~RDY~_WAIT
Text Label 2850 4950 0    50   ~ 0
XD7
Text GLabel 2650 4850 0    50   3State ~ 0
XD[0..7]
Wire Bus Line
	2650 4850 2750 4850
Entry Wire Line
	2750 4850 2850 4950
$EndSCHEMATC