СРС308 Processor Module
The Module Structure and Functioning
C P C 3 0 8 U s e r M a n u a l
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Table 3-2: Electrical Characteristics of the ISA Interface Lines
Symbol
Parameter
Conditions
Min.
Typical
Max.
Units
V
IL
Input Low Voltage for 5V cell
TTL
0.8
V
V
IL
Input Low Voltage for 3.3V cell
CMOS
0.3*VC
C3
V
V
IL
Schmitt Input Low Voltage
TTL
1.10
V
V
IH
Input Low Voltage for 5V cell
TTL
2.2
V
V
IH
Input Low Voltage for 3.3V cell
CMOS
0.7*VCC3
V
V
IH
Schmitt Input Low Voltage
TTL
1.87
V
V
IH
Input Low Voltage for 5V cell
0.4
V
V
OL
Input Low Voltage for 3.3V cell
0.4
V
V
OH
Output High Voltage for 5V cell
3.5
V
V
OH
Output High Voltage for 3.3V
cell
2.3
V
V
IL
Input Low Current
no P/D or P/U
-1
1
μA
I
IH
Input High Current
no P/D or P/U
-1
1
μA
I
OZ
Tri-state Leakage Current
-10
10
μA
C
IN
Input Capacitance
3
ρF
C
OUT
Output Capacitance
3 to 6
ρF
C
BID
Bi-directional buffer
Capacitance
3 to 6
ρF
PC/104-PCI Interface
PC/104-PCI interface uses a 120-pin (30x4) XS4 connector located on the top side of the board. It
is used to transmit all the necessary signals of the 32-bit PCI bus at 33 MHz frequency. Three Bus
Master devices are supported.
The layout of the PC/104-PCI connector contacts is shown in a figure below. The designation of
the connector contacts is described in Table 3-3: The Designation of the PC/104-PCI (XS4)
Connector Contacts.
Fig. 3-5: PC/104-PCI (XS4) Connector Contacts
