What is the maximum frequency to use when configuring Virtex-II Pro using SelectMAP with no handshaking? The Virtex-II Pro documentation states that FccNH = FccSelectMAP = 50 MHz. Refer to the "Virtex-II Pro DC and Switching Characteristic (Module 3)" data sheet and see the "SelectMAP Write Timing Characteristics" table for more information at:
The Virtex-II documentation states that FccNH = FccSelectMAP = 66 MHz. It makes more sense for FccNH to be less than Fcc_SelectMAP.
Are the Virtex-II/-Pro numbers correct?
FccNH = 50 MHz
Fcc_SelectMAP = 50 Mhz
The numbers for Virtex-II Pro are correct. The maximum SelectMAP CCLK frequency is (Fcc_SelectMAP), which is equal to the max SelectMAP CCLK frequency without handshaking, 50 MHz.
FccNH = FccSelectMAP = 50 MHz.
Since Fcc_SelectMAP = FccNH, handshaking is not required for the Virtex-II Pro SelectMAP configuration except for encrypted bitstreams, see (Xilinx Answer 14458).
If your design requires FccNH and FccSelectMAP to run at 66 MHz, a specific ordering code (SCD) can be attached for the following devices.
Virtex-II: XC2V1000, XC2V2000, XC2V3000, XC2V4000, and XC2V6000 devices.
Virtex-II Pro: XC2VP2, XC2VP4, XC2VP7, XC2VP20, and XC2VP30 devices.
For device availability and ordering information, contact your local FAE and sales office. Note that devices with this SCD do not support CLK2X as a feedback clock for DCMs.