7I43 2
HARDWARE CONFIGURATION
GENERAL
Hardware setup jumper positions assume that the 7I43 or 7I43H card is oriented in
an upright position, that is, with the USB connector towards the person doing the
configuration, and the power connector on top right. In the following, "7I43" refers to both
the 7I43 and the 7I43H.
FPGA CONFIGURATION SOURCE
The 7I43's FPGA can be configured via the USB port, The EPP port, or the on card
serial EEPROM. Jumpers W4 and W5 select the configuration source. The 7I43H does
not have the EPP configuration option.
W4
W5
MODE
DOWN
DOWN
EPP (PARALLEL PORT) CONFIG
DOWN
UP
USB CONFIG
UP
DOWN
EEPROM CONFIG
USB POWER
The 7I43 can be powered by the USB host. The maximum power that can be
supplied by a USB host is 450 mA. This will be sufficient for most but not all 7I43
applications. For applications that require more than the 450 mA supplied by the host, the
7I43 has provisions for external power. W6 connects host USB power to the 7I43's power
supplies. To use host power, W6 must be set to the "UP" position. If external 5Vpower is
used, W6 must be set to the "DOWN" position.
WARNING: Connecting an external 5V supply to the 7I43 while W6 is in the "UP"
position and a USB cable connects the 7I43 to a host computer is likely to damage
the computer by feeding external power ‘backwards’ into the USB port!
POWER ENABLE
The 7I43 can be set to power-up only after the USB interface is activated. This is
the suggested operational mode when the 7I43 is interfaced via USB. For applications
where the 7I43 must operate without the USB interface, This function must be disabled.
W7 controls the power up enable mode. When W7 is in the "UP" position, the 7I43 power
supplies are always enabled. When W7 is in the "DOWN" position, the 7I43 power
supplies will only be enabled when the USB interface is active.
Содержание 7I43
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