参数资料
型号: DO-CPLD-DK-J-G
厂商: Xilinx Inc
文件页数: 18/24页
文件大小: 0K
描述: KIT STARTER CPLD JAPANESE
标准包装: 1
系列: CoolRunner™- II
类型: CPLD 开发套件
适用于相关产品: CoolRunner-ll,XC9500XL
所含物品: 原型板,下载缆线,软件和文档
Power, Sequencing, and Slew Rates
There are three basic scenarios:
R
?
?
?
V CCINT and V CCIO rise together (both tied to the same 1.8V rail)
V CCIO before V CCINT (I/O comes alive before logic)
V CCINT before V CCIO (logic comes alive before I/O)
During configuration, the I/Os are placed in a Tristate condition with a weak pull-up to
V CCIO . If V CCIO voltage is either rising with V CCINT or is well established before V CCINT
begins rising (i.e., scenario 1 and 2), the I/Os will track V CCIO before the logic that drives
the I/Os is active. This may be seen as Logic High to a downstream device. If the output
should be driving low at power-up, then the tracking of the I/O to V CCIO might appear as
a glitch. However, this is the intended behavior as specified in the data sheet. An example
of the tracking of V CCIO by the output is shown in Figure 4 .
UG445_0 3 _111607
Figure 4:
V CCINT is powered after V CCIO
18
CPLD I/O User Guide
UG445 (v1.2) January 14, 2014
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