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CARD-PCI/GX Hardware Manual
Descriptions on symbols indicating these factors are shown below:
Symbol description
Item
Symbol
I/O
I/O
s/t/s
I/OD
I
O
OD
programmable
Voltage
3.3V
3.3V ,5VT
5VSTB
5V
pull-up
XpU(5V)
/down
xPU(3.3V)
xPU(5VSTB)
xPD
weak-PU
Weak-PD
I
/I
x/-y
OL
OH
Refe-
xPU(5V)
rence
XPU(5VSTB)
PU/PD
XPU(3.3V)
PU
pull-up
/down when
not used
22
Description
Input/output
Sustained tri-state (reference PCI v2.1))
Input and open drain output
Input only
Output only
Open drain output
Input/output is set by software.
Output is 0 to 3.3V. Input must be 0 to 3.3V.
Output is 0 to 3.3V. Input can be 0 to 5V. (5V input is TTL level.)
V
is supplied to the input/output element power supply.
CCSTB
Both input and output is 0 to 5.0V (5V input is TTL level.)
Pulled-up to 5V by resistance of xΩ inside SCE8720C.
Pulled-up to 3.3V by resistance of x Ω inside SCE8720C.
by resistance of x Ω inside SCE8720C.
Pulled-up to V
CCSTB
Pulled-down by resistance of x Ω inside SCE8720C.
Pulled-up to 5V by Approx. 40kΩ resistance.
Pulled-down by Approx. 40kΩ resistance.
Output drivability: sink current x, source current y
Pulled-up to 5V by x Ω resistance.
by x Ω resistance.
Pulled-up to V
CCSTB
Pulled-up to 3.3V by x Ω resistance.
Even when not using the signal in the system, some kind of pull-
up is necessary. NC is not available.
EPSON
Rev.A
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