T
H
E
D
E
S
I
G
N
C
Y
C
L
E
SOURCES
■ EDTP Electronics,
Inc. — Frame Thrower II
www.edtp.com or
www.nerdvilla.com
Thrower II. However, the
Frame Thrower II is built
on a four-layer printed
circuit board and the
cost for you to purchase
a single board is prohibitive. So, I’ve made
arrangements to provide
you with a kit of Frame
Thrower II parts or
assembled Frame Thrower
II units by way of my
website www.nerdvilla.
com or the EDTP
Electronics, Inc., website
at www.edtp.com.
TIME TO SET
THE FIN FLAG
You now have two
Internet protocols under
your belt. If your
application only requires
the transmission and
reception of simple data
packets, UDP is the way
to go. However, if you
want to serve web pages
or communicate via
Telnet, you’ll need to put
TCP/IP into action. While
we’re on the subject of
communicating, I have a
new email address —
peter@nerdvilla.com.
Now that you see how
simple TCP/IP is under the
covers, I’m sure you won’t
have any trouble incorporating TCP/IP into your
Design Cycle. NV
ABOUT THE
AUTHOR
■ Peter Best can be
contacted via email at
peterbest@cfl.rr.com
■ SCHEMATIC 1
8
7
6 ETH_SCK
5 ETH_SI
RB0
R5 332
CS VCC
SO HOLD
WP SCK
VSS SI
+ 5.0VDC
25LC256
100K U4
EE_CS 1
ETH_SDI_RC4 2
3
4
R17
S2
LEDC
LEDB
LEDA
R2
LED2
332
R3
332
LED3
C26
.1uF
R4
332
LED4
R2
RESET
10K
C7
.1
C25
.1uF
+ 5.0VDC
ICSP CONNEC TOR
63
PGC 5 2
PGD 4 1
D2
MCLR
1N5819
J3
3 ETH_INT_RB2
6 ETH_WOL_RB1
8 ETH_SDI_RC4
11
C24
.1uF
+ 5.0VDC
C22 C23
.1uF .1uF
63
52
41
1A 1Y
2A 2Y
3A 3Y
4A 4Y
1OE
2OE
3OE
4OE
VCC
R11 74HC125
LEDB SET FOR HALF-DUPLEX MODE
C20 .1uF
U3
ETH_INT 2
ETH_WOL 5
ETH_SO 9
CLKOUT 12
+5VDC 1
J4 4
ETH_CS 10
1 13
2
3 14
0810-1X1T-06 JPR1
180
.1uF
C21
RTC COMPONENTS NOT MOUNTED
R9 NOT MOUNTED
UNCONNEC TED PIC18F8722 PINS
AVAILABLE TO USER
ALL RESISTORS 1% UNLESS OTHERWISE NOTED
C6
.1uF
+ 3.3VCC
25MHz C28 18pF
Y2
C27 18pF
5 TXOUT RS-232 CONNEC TOR
18
1
J2/DB9 FEMALE
4 RXIN 9
19
7
5
RXIN 3
2 TXOUT
4
6
8
47uF
LED1
332
+ 3.3VDC
R1
C5 +
C4
.1uF
28
27 LEDA
26 LEDB
25
24
23
22
21
20
19
18
17 TPOUT+
16 TPOUT-
15
2
1
4
3
6
5
8
7
9
3
Vcap Vdd
Vss LEDA
CLKOUT LEDB
INT Vdd_OSC
WOL OSC2
SO OSC1
SI Vss_OSC
SCK Vss_PLL
CS Vdd_PLL
RESET Vdd_RX
Vss_RX Vss_TX
TPIN- TPOUT+
TPIN+ TPOUT-RBIAS Vdd_TX
C18
10uF U4
ENC28J60
1
14
+
2
CLKOUT 3
ETH_INT 4
ETH_WOL 5
ETH_SO 6
ETH_SI 7
ETH_SCK 8
ETH_CS 9
10
11
TPIN- 12
R10 2.7K TPIN+ 13
TPOUT/C T
TPOUT+
TPOUT-TPIN+
TPIN-TPIN/CT
LED/YEL/C
LED/YEL/A
LED/GO
LED/GO
OU T
DNG
IN
LM3940
1
VR2
2
L1
1
2
3
4
5
6
7
8
9
10
TPOU T-
TPIN+
TPIN-
TPOU T+
R16
180
R14 49. 9
C19 .01uF R13 49. 9
R12 49. 9
LEDA
LEDB
R15 49. 9
U2
TXD 2
1
RXD 3
20
SP233ACT PIN 7 = +5VDC
SP233AC T PINS 6, 9 =
GND
17 11
10 16
12
15
SP233ACT
T1IN T1OUT
T2IN T2OUT
R1OUT R1IN
R2OUT R2IN
C2+
C2+
C2-
C2-
V-V-
+ 5.0VDC
C2 C3 +
.1uF 47uF
3
R7 200
ETH_SCK_RC3
R8 200
ETH_CS_RB3
ETH_RST_RB5
R9 0
R6 200
ETH_SDO_RC5
L2 60 OHM
OU T
DNG
IN
LM2940
1
VR1
2
+ 3.3VDC
C12
.1uF
C11
.1uF
Y1
C16 18pF
C15 18pF
MCLR
C9 C10
.1uF .1uF
+ 3.3VDC
+6-9VDC
D1
C1 +
47uF
1N5819
J1
50
10MHz
24
23
18
17
16
15
14
13
5
6
7
8
10
9
79
80
1
2
22
21
20
19
62
61
60
59
39
40
41
42
12
25
32
48
71
C8
11.1uF
26
31
51
70
49
OSC2
OSC1
RF1
RF2
RF3
RF4
RF5
RF6
RF7
RG0
RG1
RC2 RG2
SCK RG3
SDI RG4
SDO MCLR/RBG5
RC6
RC7 RH0
RH1
RD0 RH2
RD1 RH3
RD2 RH4
RD3 RH5
RD4 RH6
RD5 RH7
RD6
RD7 RJ0
RJ1
RE0 RJ2
RE1 RJ3
RE2 RJ4
RE3 RJ5
RE4 RJ6
RE5 RJ7
RE6
RE7 VDD
AVDD
VDD
VDD
VDD
RC0
RC1
RF0
VSS
AVSS
VSS
VSS
VSS
RA1
RA2
RA3
RA4
RA5
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RA0
PIC18F8722
29
28
27
34
33
RB0 58
ETH_WOL_RB1 57
ETH_INT_RB2 56
ETH_CS_RB3 55
EE_CS_RB4 54
ETH_RST_RB5 53
PGC 52
PGD 47
U1
30
69
68
67
66
65
64
63
4
3
78
77
76
75
74
73
43
ETH_SCK_RC3 44
ETH_SDI_RC4 45
ETH_SD0_RC5 46
TX1 37
RX1 38
LEDA 72
LEDB
LEDC
C13 20pF
35
C14 20pF 32.768KHz
36
Y3
September 2006 89
