ram.sch

EESchema Schematic File Version 4
EELAYER 30 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 2 2
Title "Fixteen"
Date "2020-12-21"
Rev "3git"
Comp "SukkoPera"
Comment1 "Licensed under CERN OHL v.1.2"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L 74ls257:74LS257 U3
U 1 1 598EC324
P 3380 4455
F 0 "U3" H 3430 4605 50  0000 C CNN
F 1 "74LS257" H 3430 4305 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 3380 4455 50  0001 C CNN
F 3 "" H 3380 4455 50  0001 C CNN
F 4 "C707097" H 3380 4455 50  0001 C CNN "LCSC"
F 5 "HCT recommended, '157 works just as well" H 3380 4455 50  0001 C CNN "Notes"
	1    3380 4455
	1    0    0    -1  
$EndComp
$Comp
L 4464:4464 U4
U 1 1 598EC3D3
P 6580 2755
F 0 "U4" H 6580 2655 50  0000 C CNN
F 1 "4464" H 6580 2855 50  0000 C CNN
F 2 "Package_DIP:DIP-18_W7.62mm_Socket_LongPads" H 6580 2755 50  0001 C CNN
F 3 "DOCUMENTATION" H 6580 2755 50  0001 C CNN
F 4 "Get from AliExpress" H 6580 2755 50  0001 C CNN "Notes"
	1    6580 2755
	1    0    0    -1  
$EndComp
$Comp
L 4464:4464 U5
U 1 1 598EC44B
P 6580 4455
F 0 "U5" H 6580 4355 50  0000 C CNN
F 1 "4464" H 6580 4555 50  0000 C CNN
F 2 "Package_DIP:DIP-18_W7.62mm_Socket_LongPads" H 6580 4455 50  0001 C CNN
F 3 "DOCUMENTATION" H 6580 4455 50  0001 C CNN
F 4 "Get from AliExpress" H 6580 4455 50  0001 C CNN "Notes"
	1    6580 4455
	1    0    0    -1  
$EndComp
Entry Wire Line
	7870 2755 7970 2855
Entry Wire Line
	7870 2855 7970 2955
Entry Wire Line
	7870 2955 7970 3055
Entry Wire Line
	7870 3055 7970 3155
Entry Wire Line
	7870 4455 7970 4555
Entry Wire Line
	7870 4555 7970 4655
Entry Wire Line
	7870 4655 7970 4755
Entry Wire Line
	7870 4755 7970 4855
Text Label 7330 2755 0    60   ~ 0
m0
Text Label 7330 2855 0    60   ~ 0
m1
Text Label 7330 2955 0    60   ~ 0
m2
Text Label 7330 3055 0    60   ~ 0
m3
Text Label 7330 3155 0    60   ~ 0
m7
Text Label 7330 4455 0    60   ~ 0
m0
Text Label 7330 4555 0    60   ~ 0
m1
Text Label 7330 4655 0    60   ~ 0
m2
Text Label 7330 4755 0    60   ~ 0
m3
Text Label 7330 4855 0    60   ~ 0
m7
Entry Wire Line
	5380 2755 5480 2855
Entry Wire Line
	5380 2855 5480 2955
Entry Wire Line
	5380 2955 5480 3055
Text Label 5730 2855 0    60   ~ 0
m6
Text Label 5730 2955 0    60   ~ 0
m5
Text Label 5730 3055 0    60   ~ 0
m4
Entry Wire Line
	5380 4455 5480 4555
Entry Wire Line
	5380 4555 5480 4655
Entry Wire Line
	5380 4655 5480 4755
Text Label 5730 4555 0    60   ~ 0
m6
Text Label 5730 4655 0    60   ~ 0
m5
Text Label 5730 4755 0    60   ~ 0
m4
Entry Wire Line
	8070 2655 8170 2755
Entry Wire Line
	8070 2455 8170 2555
Entry Wire Line
	5180 2355 5280 2455
Entry Wire Line
	5180 2455 5280 2555
Text Label 5730 2455 0    60   ~ 0
d5
Text Label 5730 2555 0    60   ~ 0
d4
Text Label 7330 2455 0    60   ~ 0
d7
Text Label 7330 2655 0    60   ~ 0
d6
Entry Wire Line
	8070 4155 8170 4255
Entry Wire Line
	8070 4355 8170 4455
Text Label 7330 4155 0    60   ~ 0
d1
Text Label 7330 4355 0    60   ~ 0
d0
Entry Wire Line
	5180 4055 5280 4155
Entry Wire Line
	5180 4155 5280 4255
Text Label 5730 4155 0    60   ~ 0
d2
Text Label 5730 4255 0    60   ~ 0
d3
$Comp
L 74ls257:74LS257 U2
U 1 1 598F0968
P 3380 2755
F 0 "U2" H 3430 2905 50  0000 C CNN
F 1 "74LS257" H 3430 2605 50  0000 C CNN
F 2 "Package_SO:SOIC-16_3.9x9.9mm_P1.27mm" H 3380 2755 50  0001 C CNN
F 3 "" H 3380 2755 50  0001 C CNN
F 4 "C707097" H 3380 2755 50  0001 C CNN "LCSC"
F 5 "HCT recommended, '157 works just as well" H 3380 2755 50  0001 C CNN "Notes"
	1    3380 2755
	1    0    0    -1  
$EndComp
Entry Wire Line
	1930 2105 2030 2205
Entry Wire Line
	1930 2205 2030 2305
Entry Wire Line
	1930 2355 2030 2455
Entry Wire Line
	1930 2455 2030 2555
Entry Wire Line
	1930 2605 2030 2705
Entry Wire Line
	1930 2705 2030 2805
Entry Wire Line
	1930 2855 2030 2955
Entry Wire Line
	1930 2955 2030 3055
Entry Wire Line
	1930 3805 2030 3905
Entry Wire Line
	1930 3905 2030 4005
Entry Wire Line
	1930 4055 2030 4155
Entry Wire Line
	1930 4155 2030 4255
Entry Wire Line
	1930 4305 2030 4405
Entry Wire Line
	1930 4405 2030 4505
Entry Wire Line
	1930 4555 2030 4655
Entry Wire Line
	1930 4655 2030 4755
Text Label 2230 2205 0    60   ~ 0
a15
Text Label 2230 2305 0    60   ~ 0
a0
Text Label 2230 2455 0    60   ~ 0
a8
Text Label 2230 2555 0    60   ~ 0
a1
Text Label 2230 2705 0    60   ~ 0
a9
Text Label 2230 2805 0    60   ~ 0
a2
Text Label 2230 2955 0    60   ~ 0
a10
Text Label 2230 3055 0    60   ~ 0
a3
Text Label 2230 3905 0    60   ~ 0
a11
Text Label 2230 4155 0    60   ~ 0
a12
Text Label 2230 4405 0    60   ~ 0
a13
Text Label 2230 4505 0    60   ~ 0
a6
Text Label 2230 4655 0    60   ~ 0
a14
Text Label 2230 4755 0    60   ~ 0
a7
Entry Wire Line
	4580 2255 4680 2355
Entry Wire Line
	4580 2505 4680 2605
Entry Wire Line
	4580 2755 4680 2855
Entry Wire Line
	4580 3005 4680 3105
Entry Wire Line
	4580 3955 4680 4055
Entry Wire Line
	4580 4205 4680 4305
Entry Wire Line
	4580 4455 4680 4555
Entry Wire Line
	4580 4705 4680 4805
Entry Wire Line
	7870 3155 7970 3255
Entry Wire Line
	7870 4855 7970 4955
Text Label 4130 2255 0    60   ~ 0
m0
Text Label 4130 2505 0    60   ~ 0
m1
Text Label 4130 2755 0    60   ~ 0
m2
Text Label 4130 3005 0    60   ~ 0
m3
Text Label 4130 3955 0    60   ~ 0
m4
Text Label 4130 4205 0    60   ~ 0
m5
Text Label 4130 4455 0    60   ~ 0
m6
Text Label 4130 4705 0    60   ~ 0
m7
Text Label 6935 5555 0    60   ~ 0
MultiplexedAddressBus
Text Label 7770 5705 0    60   ~ 0
DataBus
Wire Wire Line
	7330 2355 7580 2355
Wire Wire Line
	8370 2355 8370 2505
Wire Wire Line
	8370 4055 8370 4155
Wire Wire Line
	7330 4055 7430 4055
Wire Wire Line
	5980 5155 5780 5155
Wire Wire Line
	5780 5155 5780 4855
Wire Wire Line
	5780 4855 5830 4855
Wire Wire Line
	5980 3505 5730 3505
Wire Wire Line
	5730 3505 5730 3155
Wire Wire Line
	5730 3155 5830 3155
Wire Wire Line
	7680 4255 7330 4255
Wire Wire Line
	7680 2555 7330 2555
Wire Wire Line
	7330 2755 7870 2755
Wire Wire Line
	7330 2855 7870 2855
Wire Wire Line
	7330 2955 7870 2955
Wire Wire Line
	7330 3055 7870 3055
Wire Wire Line
	7330 3155 7870 3155
Wire Wire Line
	7330 4455 7870 4455
Wire Wire Line
	7330 4555 7870 4555
Wire Wire Line
	7330 4655 7870 4655
Wire Wire Line
	7330 4755 7870 4755
Wire Wire Line
	7330 4855 7870 4855
Wire Wire Line
	5530 4455 5830 4455
Wire Wire Line
	5530 1655 5530 2755
Wire Wire Line
	5530 2755 5830 2755
Wire Wire Line
	5830 2355 5730 2355
Wire Wire Line
	5730 2355 5730 2055
Wire Wire Line
	5730 2055 7580 2055
Wire Wire Line
	7580 2055 7580 2355
Connection ~ 7580 2355
Wire Wire Line
	5830 4055 5730 4055
Wire Wire Line
	5730 4055 5730 3755
Wire Wire Line
	5730 3755 7430 3755
Wire Wire Line
	7430 3755 7430 4055
Connection ~ 7430 4055
Wire Wire Line
	5830 2855 5480 2855
Wire Wire Line
	5830 2955 5480 2955
Wire Wire Line
	5830 3055 5480 3055
Wire Wire Line
	5830 4555 5480 4555
Wire Wire Line
	5830 4655 5480 4655
Wire Wire Line
	5830 4755 5480 4755
Wire Wire Line
	2630 3305 2380 3305
Wire Wire Line
	2380 3305 2380 3405
Wire Wire Line
	2630 5005 2380 5005
Wire Wire Line
	2380 5005 2380 5105
Wire Wire Line
	2630 3205 1830 3205
Wire Wire Line
	1830 4905 2630 4905
Wire Wire Line
	5830 2455 5280 2455
Wire Wire Line
	5830 2555 5280 2555
Wire Wire Line
	7330 2455 8070 2455
Wire Wire Line
	7330 2655 8070 2655
Wire Wire Line
	7330 4155 8070 4155
Wire Wire Line
	7330 4355 8070 4355
Wire Wire Line
	5830 4155 5280 4155
Wire Wire Line
	5830 4255 5280 4255
Wire Wire Line
	5630 4355 5830 4355
Wire Wire Line
	5630 1955 5630 2655
Wire Wire Line
	5630 2655 5830 2655
Wire Wire Line
	2630 2205 2030 2205
Wire Wire Line
	2030 2305 2630 2305
Wire Wire Line
	2630 2455 2030 2455
Wire Wire Line
	2630 2555 2030 2555
Wire Wire Line
	2630 2705 2030 2705
Wire Wire Line
	2630 2805 2030 2805
Wire Wire Line
	2630 2955 2030 2955
Wire Wire Line
	2630 3055 2030 3055
Wire Wire Line
	2630 3905 2030 3905
Wire Wire Line
	2630 4005 2030 4005
Wire Wire Line
	2630 4155 2030 4155
Wire Wire Line
	2630 4255 2030 4255
Wire Wire Line
	2630 4405 2030 4405
Wire Wire Line
	2630 4505 2030 4505
Wire Wire Line
	2630 4655 2030 4655
Wire Wire Line
	2630 4755 2030 4755
Wire Wire Line
	4130 2255 4580 2255
Wire Wire Line
	4130 2505 4580 2505
Wire Wire Line
	4130 2755 4580 2755
Wire Wire Line
	4130 3005 4580 3005
Wire Wire Line
	4130 3955 4580 3955
Wire Wire Line
	4130 4205 4580 4205
Wire Wire Line
	4130 4455 4580 4455
Wire Wire Line
	4130 4705 4580 4705
Wire Bus Line
	4680 5555 5380 5555
Text Label 1930 1955 3    60   ~ 0
C16AddressBus
Connection ~ 5630 2655
Text Label 2230 3205 0    60   ~ 0
sel
Text Label 2230 4905 0    60   ~ 0
sel
Connection ~ 5530 2755
Wire Wire Line
	3330 1505 3330 1605
Wire Wire Line
	3330 1205 3330 1105
Wire Wire Line
	6530 1355 6530 1455
Wire Wire Line
	6530 1055 6530 955 
Wire Wire Line
	3380 6555 3380 6655
Wire Wire Line
	3380 6255 3380 6155
$Comp
L power:VCC #PWR018
U 1 1 59AAE584
P 3380 6155
F 0 "#PWR018" H 3380 6005 50  0001 C CNN
F 1 "VCC" H 3380 6305 50  0000 C CNN
F 2 "" H 3380 6155 50  0001 C CNN
F 3 "" H 3380 6155 50  0001 C CNN
	1    3380 6155
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR019
U 1 1 59AAE58A
P 3380 6655
F 0 "#PWR019" H 3380 6405 50  0001 C CNN
F 1 "GND" H 3380 6505 50  0000 C CNN
F 2 "" H 3380 6655 50  0001 C CNN
F 3 "" H 3380 6655 50  0001 C CNN
	1    3380 6655
	1    0    0    -1  
$EndComp
Wire Wire Line
	6580 6555 6580 6655
Wire Wire Line
	6580 6255 6580 6155
$Comp
L power:VCC #PWR020
U 1 1 59AAE6A8
P 6580 6155
F 0 "#PWR020" H 6580 6005 50  0001 C CNN
F 1 "VCC" H 6580 6305 50  0000 C CNN
F 2 "" H 6580 6155 50  0001 C CNN
F 3 "" H 6580 6155 50  0001 C CNN
	1    6580 6155
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR021
U 1 1 59AAE6AE
P 6580 6655
F 0 "#PWR021" H 6580 6405 50  0001 C CNN
F 1 "GND" H 6580 6505 50  0000 C CNN
F 2 "" H 6580 6655 50  0001 C CNN
F 3 "" H 6580 6655 50  0001 C CNN
	1    6580 6655
	1    0    0    -1  
$EndComp
Wire Wire Line
	7580 2355 8370 2355
Wire Wire Line
	7430 4055 8370 4055
Wire Wire Line
	5630 2655 5630 4355
Wire Wire Line
	1830 3205 1830 4905
Wire Wire Line
	5530 2755 5530 4455
$Comp
L Device:C C1
U 1 1 5FCDCCB6
P 3330 1355
F 0 "C1" H 3445 1401 50  0000 L CNN
F 1 "100n" H 3445 1310 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" H 3368 1205 50  0001 C CNN
F 3 "~" H 3330 1355 50  0001 C CNN
F 4 "C49678" H 3330 1355 50  0001 C CNN "LCSC"
	1    3330 1355
	1    0    0    -1  
$EndComp
$Comp
L Device:C C3
U 1 1 5FCE5175
P 6530 1205
F 0 "C3" H 6645 1251 50  0000 L CNN
F 1 "100n" H 6645 1160 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" H 6568 1055 50  0001 C CNN
F 3 "~" H 6530 1205 50  0001 C CNN
F 4 "C49678" H 6530 1205 50  0001 C CNN "LCSC"
	1    6530 1205
	1    0    0    -1  
$EndComp
$Comp
L Device:C C2
U 1 1 5FCEDACA
P 3380 6405
F 0 "C2" H 3495 6451 50  0000 L CNN
F 1 "100n" H 3495 6360 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" H 3418 6255 50  0001 C CNN
F 3 "~" H 3380 6405 50  0001 C CNN
F 4 "C49678" H 3380 6405 50  0001 C CNN "LCSC"
	1    3380 6405
	1    0    0    -1  
$EndComp
$Comp
L Device:C C4
U 1 1 5FCF69C6
P 6580 6405
F 0 "C4" H 6695 6451 50  0000 L CNN
F 1 "100n" H 6695 6360 50  0000 L CNN
F 2 "Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder" H 6618 6255 50  0001 C CNN
F 3 "~" H 6580 6405 50  0001 C CNN
F 4 "C49678" H 6580 6405 50  0001 C CNN "LCSC"
	1    6580 6405
	1    0    0    -1  
$EndComp
Wire Wire Line
	5530 1655 5315 1655
Text GLabel 5315 1655 0    50   Input ~ 0
~RAS
Wire Wire Line
	7680 1655 7465 1655
Text GLabel 7465 1655 0    50   Input ~ 0
~CAS_64K
Wire Wire Line
	7680 1655 7680 2555
Connection ~ 1830 3205
Wire Wire Line
	1830 3205 1615 3205
Text GLabel 1615 3205 0    50   Input ~ 0
SEL
Text GLabel 5315 1955 0    50   Input ~ 0
R_~W
Wire Wire Line
	5315 1955 5630 1955
Connection ~ 5380 5555
Wire Bus Line
	5380 5555 7970 5555
Wire Bus Line
	8170 5705 5180 5705
Wire Bus Line
	1930 1955 1615 1955
Text GLabel 1615 1955 0    50   Input ~ 0
a[0..15]
Wire Bus Line
	5180 5705 4485 5705
Connection ~ 5180 5705
Text GLabel 4485 5705 0    50   BiDi ~ 0
d[0..7]
$Comp
L power:VCC #PWR05
U 1 1 5FE07ACF
P 3330 1105
F 0 "#PWR05" H 3330 955 50  0001 C CNN
F 1 "VCC" H 3345 1278 50  0000 C CNN
F 2 "" H 3330 1105 50  0001 C CNN
F 3 "" H 3330 1105 50  0001 C CNN
	1    3330 1105
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR07
U 1 1 5FE08082
P 6530 955
F 0 "#PWR07" H 6530 805 50  0001 C CNN
F 1 "VCC" H 6545 1128 50  0000 C CNN
F 2 "" H 6530 955 50  0001 C CNN
F 3 "" H 6530 955 50  0001 C CNN
	1    6530 955 
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR08
U 1 1 5FE117BE
P 6530 1455
F 0 "#PWR08" H 6530 1205 50  0001 C CNN
F 1 "GND" H 6535 1282 50  0000 C CNN
F 2 "" H 6530 1455 50  0001 C CNN
F 3 "" H 6530 1455 50  0001 C CNN
	1    6530 1455
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR06
U 1 1 5FE11D88
P 3330 1605
F 0 "#PWR06" H 3330 1355 50  0001 C CNN
F 1 "GND" H 3335 1432 50  0000 C CNN
F 2 "" H 3330 1605 50  0001 C CNN
F 3 "" H 3330 1605 50  0001 C CNN
	1    3330 1605
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR013
U 1 1 5FE1AE80
P 2380 3405
F 0 "#PWR013" H 2380 3155 50  0001 C CNN
F 1 "GND" H 2385 3232 50  0000 C CNN
F 2 "" H 2380 3405 50  0001 C CNN
F 3 "" H 2380 3405 50  0001 C CNN
	1    2380 3405
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR014
U 1 1 5FE1B508
P 2380 5105
F 0 "#PWR014" H 2380 4855 50  0001 C CNN
F 1 "GND" H 2385 4932 50  0000 C CNN
F 2 "" H 2380 5105 50  0001 C CNN
F 3 "" H 2380 5105 50  0001 C CNN
	1    2380 5105
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR016
U 1 1 5FE203B5
P 8370 4155
F 0 "#PWR016" H 8370 3905 50  0001 C CNN
F 1 "GND" H 8375 3982 50  0000 C CNN
F 2 "" H 8370 4155 50  0001 C CNN
F 3 "" H 8370 4155 50  0001 C CNN
	1    8370 4155
	1    0    0    -1  
$EndComp
$Comp
L power:GND #PWR015
U 1 1 5FE252A0
P 8370 2505
F 0 "#PWR015" H 8370 2255 50  0001 C CNN
F 1 "GND" H 8375 2332 50  0000 C CNN
F 2 "" H 8370 2505 50  0001 C CNN
F 3 "" H 8370 2505 50  0001 C CNN
	1    8370 2505
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR017
U 1 1 5FE29F0B
P 5980 5155
F 0 "#PWR017" H 5980 5005 50  0001 C CNN
F 1 "VCC" H 5995 5328 50  0000 C CNN
F 2 "" H 5980 5155 50  0001 C CNN
F 3 "" H 5980 5155 50  0001 C CNN
	1    5980 5155
	1    0    0    -1  
$EndComp
$Comp
L power:VCC #PWR022
U 1 1 5FE30263
P 5980 3505
F 0 "#PWR022" H 5980 3355 50  0001 C CNN
F 1 "VCC" H 5995 3678 50  0000 C CNN
F 2 "" H 5980 3505 50  0001 C CNN
F 3 "" H 5980 3505 50  0001 C CNN
	1    5980 3505
	1    0    0    -1  
$EndComp
Wire Wire Line
	7680 4255 7680 2555
Connection ~ 7680 2555
Text Label 2230 4255 0    60   ~ 0
a5
Text Label 2230 4005 0    60   ~ 0
a4
Wire Bus Line
	5180 2355 5180 5705
Wire Bus Line
	8170 2555 8170 5705
Wire Bus Line
	5380 2755 5380 5555
Wire Bus Line
	4680 2355 4680 5555
Wire Bus Line
	7970 2855 7970 5555
Wire Bus Line
	1930 1955 1930 4655
$EndSCHEMATC