Siemens SPC3 - Manual (Page 42)

PROFIBUS Interface Center SPC3
Page 40 V1.3 SPC3 Hardware Description
2003/04 Copyright (C) Siemens AG 2003. All rights reserved.
WR
RD
INTR
READY-
Logic
Clock -Generator
48 MHz
80286
+
Buscontr.
(82288) +
82244
DB
AB
CLK
XWR
XRD
X/INT
XREADY
80286-System (X86-Mode)
3K3
Mode
GND
SPC3
Reset
RTS
TxD
RxD
XCTS
1K
GND
EPROM
64kB
RAM
32kB
Address
Decoder
Reset
SPC3
12/24 MHz
Teiler
:2/4
DIVIDER
AB 23...0 AB 12...1
DB 15...0
DB 7...0
XCS
CS
CSRAM
CSEPROM
Driver, Control-logic
DB
(7..0)
AB
(10..0
)
RD WR