參數(shù)資料
型號: XC95288XL-10BG352C
英文描述: Flash Complex PLD
中文描述: 閃光復雜可編程邏輯器件
文件頁數(shù): 10/16頁
文件大小: 133K
代理商: XC95288XL-10BG352C
R
XC9500 In-System Programmable CPLD Family
10
September 15, 1999 (Version 5.0)
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
Figure 10
for
details.
The input buffer is compatible with standard 5 V CMOS, 5 V
TTL and 3.3 V signal levels. The input buffer uses the internal
5 V voltage supply (V
CCINT
) to ensure that the input thresh-
olds are constant and do not vary with the V
CCIO
voltage.
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 mac-
rocells, and four global output enables for devices with 180
or more macrocells. Both polarities of any of the global
3-state control (GTS) pins may be used within the device.
Figure 10: I/O Block and Output Enable Capability
I/O Block
V
CCIO
Macrocell
X5899_01
Product Term OE
PTOE
Switch Matrix
OUT
(Inversion in
AND-array)
Global OE 1
1
To other
Macrocells
V
CCINT
Slew Rate
Control
0
Global OE 2
Available in
XC95216
and XC95288
Global OE 3
Global OE 4
I/O/GTS1
I/O
I/O/GTS2
I/O/GTS3
I/O/GTS4
To FastCONNECT
User-
Programmable
Ground
Pull-up
Resistor
*
* Pull-up resistors are used to prevent
floating pins during programming
and other times. They are disabled
during normal operations.
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