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讨论XC9500XL在系统可编程的速度
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大小:333 |
2009-05-13
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XC9500XL devices receive programming vectors and
instructions via the JTAG Test Access Port. During programming,
the address and data information is shifted in
first and then a programming time is initiated to imprint the
programming data into the selected flash cells. This is
repeated for all flash memory addresses within the device.
Therefore, the time required to program an XC9500XL
device includes two components: the information download
time and the flash memory programming time. In the typical
application, where the JTAG clock operates from 1MHz to
10 MHz, the flash memory programming time exceeds 90%
of the total programming time.
instructions via the JTAG Test Access Port. During programming,
the address and data information is shifted in
first and then a programming time is initiated to imprint the
programming data into the selected flash cells. This is
repeated for all flash memory addresses within the device.
Therefore, the time required to program an XC9500XL
device includes two components: the information download
time and the flash memory programming time. In the typical
application, where the JTAG clock operates from 1MHz to
10 MHz, the flash memory programming time exceeds 90%
of the total programming time.
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