R
QPRO Family of XC1700D QML Configuration PROMs
Standby Mode
Programming
The PROM enters a low-power standby mode whenever CE
is asserted High. The output remains in a high impedance
state regardless of the state of the OE input.
The devices can be programmed on programmers supplied
by Xilinx or qualified third-party vendors. The user must
ensure that the appropriate programming algorithm and the
latest version of the programmer software are used. The
wrong choice can permanently damage the device.
Table 1: Truth Table for XC1700 Control Inputs
Control Inputs
Outputs
RESET
CE
Internal Address
DATA
CEO
I
CC
Inactive
Low
If address < TC: increment
If address > TC: don’t change
Active
High-Z
High
Low
Active
reduced
Active
Inactive
Active
Low
High
High
Held reset
Not changing
Held reset
High-Z
High-Z
High-Z
High
High
High
Active
Standby
Standby
Notes:
1. The XC1700 RESET input has programmable polarity
2. TC = Terminal Count = highest address value. TC + 1 = address 0.
Important: Always tie the V pin to V
in your application. Never leave V floating.
PP
CC
PP
DS070 (v2.1) June 1, 2000
www.xilinx.com
5
Product Specification
1-800-255-7778
XILINX [ XILINX, INC ]
