Rainbow Electronics ATF1500ABV - Manual (Page 12)

12
ATF1500ABV
0723I–08/01
Output Slew
Rate Control
Each ATF1500ABV macrocell contains a configuration bit for each I/O to control its output
slew rate. This allows selected data paths to operate at maximum throughput while reducing
system noise from outputs that are not speed-critical. Outputs default to slow edges, and may
be individually set to fast in the design file. Output transition times for outputs configured as
“slow” have a t
SSO
delay adder.
Security Fuse
Usage
A single fuse is provided to prevent unauthorized copying of the ATF1500ABV fuse patterns.
Once programmed, fuse verify and preload are prohibited. However, the 160-bit User Signa-
ture remains accessible.
The security fuse should be programmed last, as its effect is immediate.