XC9500 Xilinx Corp., XC9500 Datasheet - Page 10

• Manufacturer Part Number: XC9500
• Description: XC9500 5 V CPLD Family
• Manufacturer: Xilinx Corp.

XC9500 In-System Programmable CPLD Family
I/O Block
The I/O Block (IOB) interfaces between the internal logic
and the device user I/O pins. Each IOB includes an input
buffer, output driver, output enable selection multiplexer,
and user programmable ground control. See
details.
The input buffer is compatible with standard 5V CMOS, 5V
TTL, and 3.3V signal levels. The input buffer uses the internal
10
Macrocell
(Inversion in
I/O/GTS1
AND-array)
I/O/GTS2
I/O/GTS3
I/O/GTS4
Product Term OE
To Fast CONNECT
Switch Matrix
Figure 10: I/O Block and Output Enable Capability
Global OE 1
Global OE 2
Global OE 3
Global OE 4
PTOE
OUT
Figure 10
www.xilinx.com
1-800-255-7778
for
5V voltage supply (V
olds are constant and do not vary with the V
The output enable may be generated from one of four
options: a product term signal from the macrocell, any of the
global OE signals, always “1”, or always “0”. There are two
global output enables for devices with up to 144 macrocells,
and four global output enables for devices with 180 or more
macrocells. Both polarities of any of the global 3-state con-
trol (GTS) pins may be used within the device.
Macrocells
To other
1
0
Available in
XC95216
and XC95288
Slew Rate
Control
CCINT
Programmable
) to ensure that the input thresh-
Ground
User-
DS063 (v5.1) September 22, 2003
Resistor*
Pull-up
V
I/O Block
CCIO
Product Specification
DS063_10_092203
CCIO
I/O
voltage.
R