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Internal Probing Feature for Antifuse Families
user I/O’s to achieve successful layout, then the tool will use these pins as user I/Os. If you assign user I/Os
to the PRA and PRB pins and select the Reserve Probe Pin option, the Layout tool overrides the “Reserve
Probe Pin” option.
Design Considerations
Avoid using the TDI, TCK, TDO, PRA, and PRB pins as input or bidirectional ports. Since these pins are
active during probing, critical input signals through these pins are not available. In addition, do not program
the Security Fuse. Programming the Security Fuse disables the Probe Circuit. However, you can still read
the checksum.
Internal Probing Feature for Antifuse Families
Depending on the status of the MODE pin and whether or not the security fuse was programmed, the I/O
capability of the probe pins varies. The probe pins are the PRA, PRB, SDI, and DCLK pins and are used by
the Silicon Explorer for internal signal probing. Consult the Pin Editor or the I/O Attribute Editor to determine
the pin numbers for these pins in the device you are using. The following tables show the I/O capability of
the probe pins for all the MODE/Security combinations.
Table 12 · ACT 1 and 40MX Devices
Mode
Low
Low
Low
Low
High
High
High
High
Program
No
No
Yes
Yes
No
No
Yes
Yes
Probe
No
Yes
No
Yes
No
Yes
No
Yes
PRA, PRB
User Defined I/O
User Defined I/O
User Defined I/O
User Defined I/O
Probe Circuit Outputs
Probe Circuit Disabled
Probe Circuit Outputs
Probe Circuit Disabled
SDI, DCLK
User Defined Input
User Defined Input
User Defined I/O
User Defined I/O
Probe Circuit Inputs
Probe Circuit Disabled
Probe Circuit Inputs
Probe Circuit Disabled
Table 13 · ACT, 1200XL, 3200DX, ACT 3, 42MX
Mode or TMS
Low
High
High
Security
No
Yes
PRA, PRB
User Defined I/O
Probe Circuit Outputs
Probe Circuit Disabled
SDI/TDI, DCLK/TCK
User Defined I/O
Probe Circuits Inputs
Probe Circuit Disabled
Table 14 · SX, eX, SX-A, AX
TMS
Low
High
Security
No
PRA, PRB, (PRC, PRD) 1
User Defined I/O
Probe Circuit Outputs
TDI, TCK
User Defined I/O
Probe Circuit Inputs
Silicon Explorer II User's Guide
51
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