© 2000 Scenix Semiconductor, Inc. All rights reserved. 15 SX User’s Manual Rev. 3.1 www.scenix.com Chapter 1 Overview Furthermore, the growing Virtual Peripheral library features new components, such as the Internet
Protocol stack, and communication interfaces, that allow design engineers to embed Internet connec-
tivity into all of their products at extremely low cost and very little effort.
Scenix’s complete network connectivity protocol stack implementation (SX-Stack), enables single-
chip Web servers and E-mail appliances in embedded applications. The implementation includes the
physical layer interface with the TCP/IP network connectivity protocols, enabling system designers to
produce cost-effective embedded Internet devices without external physical access or a gateway PC.
The hardware platform for SX-Stack is the SX52BD communications controller. The device allows
implementation  of  the  entire  TCP/IP  protocols,  physical  interface,  and  other  relevant  high-speed
communication interfaces as Virtual Peripheral modules. 1.8 Part Numbers and Pinout Diagrams This user’s guide describes the following Scenix SX devices: • SX18AC/SX20AC/  SX28AC  and  SX18AC75/SX20AC75/SX28AC75  devices  (with  2K  pro-
gram memories) • SX48BD/SX52BD devices (with 4K program memories and multi-function timers) The SX18AC/20AC/28AC and SX18AC75/SX20AC75/SX28AC75 devices are available in the pin
configurations shown in Figure 1-1. These devices are functionally the same except that the 18-pin and
20-pin devices do not have the port pins RC0 through RC7. Therefore, Port C cannot be used in the
smaller packages. Figure 1-1 SX18/20/28 Pin Assignments SSOP 1
2
3
4
5
6
7
8 16
15 RC4
RC3 RB6
RB5 SX 28-PIN OSC2
RC7
RC6
RC5 Vdd
Vdd RA2
RA3
RB0
RB1
RB2
RB3
RB4 Vss MCLR
OSC1 RC2
RC1
RC0
RB7 9
10
11
12
13
14 28
27
26
25
24
23
22
21
20
19
18
17      Vss
RTCC RA0
RA1 1
2
3
4
5
6
7
8 16
15 RC4
RC3 RB6
RB5 SX 28-PIN OSC2
RC7
RC6
RC5 n.c.
Vss RA2
RA3
RB0
RB1
RB2
RB3
RB4 MCLR
OSC1 RC2
RC1
RC0
RB7 9
10
11
12
13
14 28
27
26
25
24
23
22
21
20
19
18
17 RTCC Vdd RA0
RA1 n.c. DIP/SOIC 1
2
3
4
5
6
7
8 16
15 RB5
RB4 SX 20-PIN OSC2 RTCC RA0 RB0
RB1
RB2
RB3 MCLR OSC1 Vdd
Vdd
RB7
RB6 9
10 14
13
12
11 20
19
18
17 RA2
RA3 Vss RA1 Vss SSOP 13 1
2
3
4
5
6
7
8 16 RB5
RB4 SX 18-PIN OSC2 RTCC RA0 RB0
RB1
RB2
RB3 MCLR OSC1 Vdd
RB7
RB6 9 10 14 12
11 18
17 RA2
RA3 RA1 Vss DIP/SOIC 15