Siemens SIMATIC NET SPC 4-2 LF, Руководство пользователя, Страница: 16 / 178

PROFIBUS Controller SPC 4®-2 LF
16
C79000-G8976-C157-3
The SPC 4-2 has a 44-pin plastic quad flat package housing (see Chapter 11). The
pin assignment is described in Table 3-1 Pin Assignment
Note:
All signals that start with X.. are LOW-active
Pin Signal name In/
Out
Description Source / Dest Processor
Variant
1 XCS I Chip select CPU C32 mode: connect
to VDD
otherwise: CS
signal
2 XWR / E I Write signal
E-clock with Motorola 1 clock
pulse=1 memory cycle (in
asynchronous mode, connect to
VDD) CPU
3 DIVIDER I Divider for ISCLK-OUT (pin 7)
0=:4, 1=:2 System
4 XRD
R/W
I Read signal
Read/Write with Motorola
(low=write)
CPU
5 CLK I Clock input System
6 VSS
7 ISCLK-Out L Input clock, divided by 2 or 4 System, CPU
8 Type I Data format of processor interface
(see Mode Table)
9 XINT L Interrupt output CPU, Interrupt-Contr.
10 XINTCI L Port pin in the compatibility mode,
in the extended mode interrupt
output clock synchronization CPU, Interrupt-Contr. Port pin bit 1 of
mode register 2
11 DB0 I/O Data bus CPU, memory C32 mode:
data/address bus
multiplexed
12 DB1 I/O Data bus CPU, memory Otherwise:
data/address bus
separate
13 XHOLDTOKEN L Port pin in compatibility mode, in
extended mode trigger output for
measurements Port pin bit 0 of
mode register 2
14 XREADY
XDTACK
L Ready for external CPU
Data transfer acknowledge with
Motorola System, CPU
15 DB2 I/O Data bus CPU, memory C32 mode:
data/address bus
multiplexed
16 DB3 I/O Data bus CPU, memory Otherwise:
data/address bus
separate
17 VSS
18 VDD
19 DB4 I/O Data bus CPU, memory C32 mode: data