R
Platform Flash In-System Programmable Configuration PROMs
AC Characteristics Over Operating Conditions When Cascading
X-Ref Target - Figure 10
OE/RESET
CE
CLK
CLKOUT
(optional)
T
T
CDF
CODF
DATA
CEO
Last Bit
First Bit
T
OCE
T
OOE
T
OCK
T
COCE
ds123_23_102203
XCF01S, XCF02S,
XCF04S
XCF08P, XCF16P,
XCF32P
Symbol
Description
Units
Min
Max
Min
Max
CLK to output float delay(2,3)
when VCCO = 2.5V or 3.3V
–
25
–
20
ns
TCDF
CLK to output float delay(2,3) when VCCO = 1.8V
–
–
–
–
–
–
–
–
–
35
20
35
20
35
20
35
–
–
–
–
–
–
–
–
–
–
20
20
20
80
80
80
80
20
20
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLK to CEO delay(3,5) when VCCO = 2.5V or 3.3V
CLK to CEO delay(3,5) when VCCO = 1.8V
TOCK
TOCE
TOOE
TCOCE
CE to CEO delay(3,6) when VCCO = 2.5V or 3.3V
CE to CEO delay(3,6) when VCCO = 1.8V
OE/RESET to CEO delay(3) when VCCO = 2.5V or 3.3V
OE/RESET to CEO delay(3) when VCCO = 1.8V
CLKOUT to CEO delay when VCCO = 2.5V or 3.3V
CLKOUT to CEO delay when VCCO = 1.8V
–
CLKOUT to output float delay
when VCCO = 2.5V or 3.3V
–
–
–
–
–
–
25
25
ns
ns
TCODF
CLKOUT to output float delay when VCCO = 1.8V
Notes:
1. AC test load = 50 pF for XCF01S/XCF02S/XCF04S; 30 pF for XCF08P/XCF16P/XCF32P.
2. Float delays are measured with 5 pF AC loads. Transition is measured at 200 mV from steady state active levels.
3. Guaranteed by design, not tested.
4. All AC parameters are measured with V = 0.0V and V = 3.0V.
IL
IH
5. For cascaded PROMs, if the FPGA’s dual-purpose configuration data pins are set to persist as configuration pins, the minimum period is
increased based on the CLK to CEO and CE to data propagation delays:
- T
- T
minimum = T
+ T + FPGA Data setup time
CYC
CAC
OCK CE
OCK
maximum = T
+ T
CE
6. For cascaded PROMs, if the FPGA’s dual-purpose configuration data pins become general I/O pins after configuration; to allow for the
disable to propagate to the cascaded PROMs and to avoid contention on the data lines following configuration, the minimum period is
increased based on the CE to CEO and CE to data propagation delays:
- T
- T
minimum = T
+ T
CYC
CAC
OCE CE
OCK
maximum = T
+ T
CE
DS123 (v2.18) May 19, 2010
www.xilinx.com
Product Specification
23
XILINX [ XILINX, INC ]
