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Hardware Information
Pin No.
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
C18
#
low active
Under normal conditions, the signals -SBHE, LA17 - LA23, -MEMR and MEMW
are operated as outputs (sending from the CPU). Only CPU boards which are
suitable for use as a master CPU for system bus access send and receive these
signals. A minus sign "-" in front of the signal name shows that the signal is LOW
active.
7-34
Designation
SBHE#
LA 23
LA 22
LA 21
LA 20
LA 19
LA 18
LA 17
MEMR#
MEMW#
SD 08
SD 09
SD 10
SD 11
SD 12
SD 13
SD 14
SD 15
Type *
Pin No.
Designation
O
D1
MEMCS16#
I/O
D2
IOCS16#
I/O
D3
IRQ 10
I/O
D4
IRQ 11
I/O
D5
IRQ 12
I/O
D6
IRQ 15
I/O
D7
IRQ 14
I/O
D8
DACK0#
I/O
D9
DRQ 0
I/O
D10
DACK5#
I/O
D11
DRQ 5
I/O
D12
DACK6#
I/O
D13
DRQ 6
I/O
D14
DACK7#
I/O
D15
DRQ 7
I/O
D16
+ 5V
I/O
D17
MASTER#
I/O
D18
0 V
Type
I
I
I
I
I
I
I
O
I
O
I
O
I
O
I
V
CC
I
GND
SIMATIC Box PC 840 Manual
A5E00085984-04
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