A54SX16-1CG256 ACTEL [Actel Corporation], A54SX16-1CG256 Datasheet - Page 15

• Manufacturer Part Number: A54SX16-1CG256
• Description: SX Family FPGAs RadTolerant and HiRel
• Manufacturer: ACTEL [Actel Corporation]

Design Considerations
For prototyping, the TDI, TCK, TDO, PRA, and PRB pins should not be used as input or bidirectional ports. Because
these pins are active during probing, critical signals input through these pins are not available while probing. In
addition, the security fuse should not be programmed during prototyping because doing so disables the probe
circuitry.
Figure 1-11 • Probe Setup
Related Documents
Datasheets
54SX Family FPGAs
http://www.actel.com/documents/A54SXDS.pdf
Application Notes
Power-Up and Power-Down Behavior of 54SX and RT54SX Devices
http://www.actel.com/documents/PowerUpAN.pdf
Serial Connection
Silicon Explorer II
v2.1
TDO
TRST
TMS
TCK
PRA
PRB
SX Family FPGAs RadTolerant and HiRel
RTSX-S FPGA
1-11