R
Platform Flash In-System Programmable Configuration PROMS
configuration is complete, and is also connected to the
PROM CE pin to enable low-power standby mode, then an
external buffer should be used to drive the LED circuit to
ensure valid transitions on the PROM’s CE pin. If low-power
standby mode is not required for the PROM, then the CE pin
should be connected to ground.
Table 9: Truth Table for XCFxxS PROM Control Inputs
Control Inputs
Outputs
OE/RESET
CE
Internal Address
If address < TC(2) : increment
If address = TC(2) : don't change
Held reset
DATA
Active
High-Z
High-Z
High-Z
CEO
High
Low
ICC
Active
High
Low
Reduced
Active
Low
X(1)
Low
High
High
High
Held reset
Standby
Notes:
1. X = don’t care.
2. TC = Terminal Count = highest address value. TC + 1 = address 0.
Table 10: Truth Table for XCFxxP PROM Control Inputs
Control Inputs
Outputs
OE/RESET
CE
CF
BUSY
Internal Address
DATA
CEO
CLKOUT
ICC
If address < TC(2) and
Active
High-Z
High-Z
High
High
Low
High
Active
Active
address < EA(3) : increment
If address < TC(2) and
High
Low
High
Low
High-Z
High-Z
Active
Reduced
Reduced
Active
address = EA(3) : don't change
Else
If address = TC(2) : don't change
Active and
Unchanged
High
Low
High
High
Unchanged
High
Low
X
Low
Low
High
Low
X
X(1)
X
Held reset(4)
Held reset(4)
Held reset(4)
Active
High-Z
High-Z
High
High
High
Active
High-Z
High-Z
Active
Active
X
X
Standby
Notes:
1. X = don’t care.
2. TC = Terminal Count = highest address value. TC + 1 = address 0.
3. For the XCFxxP with Design Revisioning enabled, EA = end address (last address in the selected design revision).
4. For the XCFxxP with Design Revisioning enabled, Held Reset = address reset to the beginning address of the selected bank. If Design Revisioning
is not enabled, then Held Reset = address reset to address 0.
DC Electrical Characteristics
•Absolute Maximum Ratings, page 24
•Supply Voltage Requirements for Power-On Reset and Power-Down, page 24
•Recommended Operating Conditions, page 25
•Quality and Reliability Characteristics, page 25
•DC Characteristics Over Operating Conditions, page 26
AC Electrical Characteristics
•AC Characteristics Over Operating Conditions, page 27
•AC Characteristics Over Operating Conditions When Cascading, page 30
DS123 (v2.4) July 20, 2004
www.xilinx.com
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Preliminary Product Specification
1-800-255-7778
XILINX [ XILINX, INC ]
