Pentek Onyx 78741, Installation Manual

Page: 13 / 30

Pentek Model 78741 Installation Manual Page 13
Rev.: 2.5
2.4 XMC Module Switches
(continued)
Switch
SW1
provides user control over the FPGA MGT clocks used for the XMC inter−
face. The following table shows the settings for this switch.
Model 78741 is shipped with a default FPGA configuration on FLASH memory, which
is loaded at power−up. Up to four FPGA configurations can be stored in FLASH, iden−
tified as Version 0, Version 1, Version 2, and Version 3. The default FPGA configuration
is located in the Version 0 space. The other three positions are empty. The board is
shipped with the FPGA configuration SW (
SW1-2 ) set to ON, which sets the board’s
maximum speed to Gen 3. However, the board can negotiate down to Gen 2 or Gen 1
x4, as needed. Note that Gen 3 requires about 2 watts power more than Gen 2.
Table 2
−
1: SW1
−
FPGA Configuration
Switch Function ON OFF
SW1
−
1 FLASH Memory Write Protect/Write Enable Write Protected * Write Enabled
SW1
−
2 PLX PCIe Switch Maximum Speed Select Max. Speed = Gen 3* Max. Speed = Gen 2
SW1
−
3
Select Boot Configuration at power on See Table 2
−
2 below
SW1
−
4
SW1
−
5 PCIe Clock Select XMC P15 Clock * Oscillator
SW1
−
6 P16 Clock Select XMC P16 Clock * Oscillator
SW1
−
7 JTAG Source Select XMC JTAG* Board JTAG
SW1
−
8
GateXpress JTAG Bypass (Factory Use Only)
a
a. SW1
−
8 (factory use only) selects whether all JTAG-linked components on the board are inserted into the JTAG
chain or whether only the Virtex-7 is in the JTAG chain. Only the Virtex-7 can be user modified. Customers
should maintain the factory setting of “bypassed”. When not bypassed, JTAG activity may affect the PCIe link.
Not Bypassed Bypassed *
SW1
−
9 GateXpress Disable S6 is Disabled S6 is Enabled *
SW1
−
10 Spare
* Factory Default Settings
Note: For Model 78741, JTAG Source Select will be set to ON (XMC JTAG) by default.
Table 2
−
2: FPGA Configuration Select
−
Switches SW1
−
3:4
SW1
−
3 SW1
−
4 Configuration Select (FLASH)
ON * ON * Version 0 Boot Code
−
Gen 3 x8 PCIe
OFF ON Version 1 Boot Code
ON OFF Version 2 Boot Code
OFF OFF Version 3 Boot Code
* Factory Default Setting
See Model 71741 Operating Manual for description of FLASH Memory use.