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Table 4: Connections between the XS40 Board and XStend Board resources.
1
77
2
78 +5V
3
1
4
2
5
3
6
5
DIPSW4
7
6
DIPSW1
8
7
DIPSW2
9
11
DIPSW3
10
35
11
31
12
69
13
9
14
13
15
28
16
30
17
29
18
14
19
15
20
17
21
68
22
33
23
18
24
19
25
21
26
23
27
32
28
34
29
20
30
31
12
32
81
33
25
34
80
35
39
36
45
37
10
RESET_
38
40
39
41
40
43
41
44
42
4
43
44
46
45
47
46
48
47
50
48
51
49
52
50
53
51
54
52
49 GND
53
54
+3.3V
55
PROGRAM
56
55
57
56
58
57
59
58
60
61
61
62
62
63
63
64
65
65
66
66
DIPSW7
67
24,67
SPARE_
68
26
69
70
DIPSW8
70
71
DIPSW6
71
28
72
59
73
30
74
74
75
59
76
76
77
72
DIPSW5
78
75
79
79
80
36
81
37
82
82
83
83
84
84
LS_0
A0
LS_1
A1
LS_2
A2
LRCK
LCE_
RCE_
MCLK
D_8
AD7
S5
RED1
S6
HSYNC_
S3
GREEN1
S4
RED0
S2
GREEN0
S0
BLUE0
S1
BLUE1
RDP_
A15
D_5
AD4
D_4
AD3
D_3
AD2
D_2
AD1
D_1
AD0
CCLK
CDIN
CS_
RS_4
A12
RS_2
A10
RS_3
A11
RS_1
A9
RS_5
A13
RS_0
A8
RS_6
A14
OE_
WR_
CE_
SDOUT P16
VSYNC_
KB_CLK
KB_DATA
SDIN
SCLK
LS_3
A3
LS_4
A4
D_7
AD6
D_6
AD5
LS_5
A5
LS_6
A6
LDP_
A7
Uncommitted XS95 I/O pin
+5V power source
LED segment; address line
LED segment; address line
LED segment; address line
P13
DIP switch; codec control; uC I/O
P10
DIP switch; RAM chip-enable, uC I/O port
P11
DIP switch; RAM chip-enable, uC I/O port
P12
DIP switch; codec clock; uC I/O port
P07
LED; RAM data line; uC muxed address/data line
Uncommitted XS95 I/O pin
Uncommitted XS95 I/O pin
CLK
XS40/95 oscillator output
PSEN_
uC program storage-enable
JTAG TDI; DIN
JTAG TCK; CCLK
JTAG TMS
XS Board LED segment; VGA color signal
XS Board LED segment; VGA horiz. sync.
XS Board LED segment; VGA color signal
Uncommitted XS95 I/O pin
Uncommitted XS95 I/O pin
XS Board LED segment; VGA color signal
XS Board LED segment; VGA color signal
XS Board LED segment; VGA color signal
XS Board LED segment; VGA color signal
RD_
uC read line
P27
LED decimal-point; address line; uC I/O port
ALE_
uC address-latch-enable
Serial EEPROM chip-enable
Uncommitted XS95 I/O pin
PC_D6
PC parallel port output
Uncommitted XS95 I/O pin
PC_D7
PC parallel port output
P04
LED; RAM data line; uC muxed address/data line
RST
uC reset line
XTAL1
Pushbutton; uC clock line
P03
LED; RAM data line; uC muxed address/data line
P02
LED; RAM data line; uC muxed address/data line
P01
LED; RAM data line; uC muxed address/data line
P00
LED; RAM data line; uC muxed address/data line
Uncommitted XS95 I/O pin
Unconnected
PC_D0
Codec control line; PC parallel port output
PC_D1
Codec control line; PC parallel port output
PC_D2
Codec control line; PC parallel port output
PC_D3
PC parallel port output
PC_D4
PC parallel port output
PC_D5
PC parallel port output
P24
LED segment; address line; uC I/O port
P22
LED segment; address line; uC I/O port
Power supply ground
Unconnected
+3.3V/+5V power supply (4000E/4000XL)
XS40 configuration control
P23
LED segment; address line; uC I/O port
P21
LED segment; address line; uC I/O port
P25
LED segment; address line; uC I/O port
P20
LED segment; address line; uC I/O port
P26
LED segment; address line; uC I/O port
RAM output-enable
P36
RAM write-enable; uC I/O port
Unconnected
Unconnected
XS Board RAM chip-enable
DIP switch; codec output data; uC I/O port
P17
Pushbutton; VGA horiz. sync.; uC I/O port
P34
PS/2 keyboard clock; uC I/O port
P31
DIP switch; keyboard serial data; uC I/O port
P15
DIP switch; codec input data; uC I/O port
JTAG TDI; DIN
JTAG TDO; DOUT
JTAG TCK; CCLK
Uncommitted XS95 I/O pin
JTAG TDO; DOUT
Uncommitted XS95 I/O pin
P14
DIP switch; codec serial clock; uC I/O port
LED segment; address line
LED segment; address line
P06
LED; RAM data line; uC muxed address/data line
P05
LED; RAM data line; uC muxed address/data line
LED segment; address line
LED segment; address line
LED decimal-point; address line
Function
P35
P36
P29
P24
P19
P20
P23
P61
P41
P66
P56
P57
P58
P59
P60
P48
P45
P55
P51
P47
P50
P46
P49
P27
P18
P28
P26
P25
P44
P38
P62
P65
P40
P39
P37
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