R
Platform Flash In-System Programmable Configuration PROMS
Symbol
Description
CLKOUT alternate (slower) frequency
(10)
CLKOUT alternate (slower) frequency with decompression
(11)
XCF08P, XCF16P,
XCF32P
Min
Max
25
12.5
Units
MHz
MHz
F
S
Notes:
12.5
6
AC test load = 50 pF for XCF01S/XCF02S/XCF04S; 30 pF for XCF08P/XCF16P/XCF32P.
Float delays are measured with 5 pF AC loads. Transition is measured at ±200 mV from steady-state active levels.
Guaranteed by design, not tested.
All AC parameters are measured with V
IL
= 0.0V and V
IH
= 3.0V.
If T
HCE
High < 2
µs,
T
CE
= 2
µs.
If T
HOE
Low < 2
µs,
T
OE
= 2
µs.
The delay before the enabled CLKOUT signal begins clocking data out of the device is dependent on the clocking configuration. The delay
before CLKOUT is enabled will increase if decompression is enabled.
8. Slower CLK frequency option may be required to meet the FPGA data sheet setup time.
9. Typical CLKOUT default (fast) period = 25 ns (40 MHz)
10. Typical CLKOUT alternate (slower) period = 50 ns (20 MHz)
11. When decompression is enabled, the CLKOUT signal becomes a controlled clock output. When decompressed data is available, CLKOUT
will toggle at �½ the source clock frequency (either �½ the selected internal clock frequency or �½ the external CLK input frequency). When
decompressed data is not available, the CLKOUT pin is parked High. If CLKOUT is used, then it must be pulled High externally using a 4.7kΩ
pull-up to V
CCO
.
12. When JTAG CONFIG command is issued, PROM will drive CF Low for at least the T
HCF
minimum.
1.
2.
3.
4.
5.
6.
7.
DS123 (v2.9) May 09, 2006
35
XILINX [ XILINX, INC ]
