Asic Interface; Mode Register; Mode Register 0 - Siemens SPC3 Hardware Description

5 ASIC Interface

The registers that determine both the hardware function of the ASIC as well as telegram processing are
described in the following.

5.1 Mode Register

Parameter bits that access the controller directly or which the controller directly sets are combined in two
mode registers (0 and 1) in the SPC3.

5.1.1 Mode Register 0

Setting parameters for Mode Register 0 takes place in the offline state only (for example, after
switching on). The SPC3 may not exit offline until Mode Register 0, all processor parameters, and
organizational parameters are loaded (START_SPC3 = 1, Mode-Register 1).
Address
Control 7
Register
06H Freeze_ Sync_
Support- Support-
(Intel)
ed
Address
Control 15 14
Register
07H
(Intel)
*) When Spec_Clear_Mode (Fail Safe Mode ) = 1 the SPC3 will accept data telegramm with a data unit=0 in
the state Data Exchange. The reaction to the outputs can be parameterized f.e. in the parameterization
telegram ( only available from version Step C).
**) When using a big number of parameters to be transmitted from the PROFIBUS-Master to the slave the
Auxiliary buffer ½ has to have the same size like the Parameterization buffer. Sometimes this could reach
the limit of the available memory space in the SPC3. When Spec_Prm_Puf_Mode = 1 the parameterization
data are processed directly in this special buffer and the Auxiliary buffers can be held compact.
SPC3 Hardware Description
Copyright (C) Siemens AG 2003 All rights reserved.
SPC3
Bit Position
6 5 4
EARLY_ INT_
RDY POL
ed
Bit Position
13 12
Spec_Cle Spec_Prm_
ar_Mode Puf_Mode
*) **)
PROFIBUS Interface Center
3 2 1
DIS_
MinTSDR STOP_
CON
TROL
11 10 9
WD User EOI
Test Time Time
base base
V1.3
Designation
0
DIS_ Mode Reg0
START_
7..0
CON
TROL
Designation
8
DP
Mode-Reg0
Mode
13 .. 8
Page 17
2003/04