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REHOSTABLE CMC FPDP INTERFACE
Copyright 2012 11-3 FibreXtreme HW Reference for FPDP Cards
11.4.1 Configuration Signal Interconnects
SL240 rehostable CMC cards, whether used as source or destination cards, need to have
the configuration connector wired. The configuration connector is in position P3. Table
11-2 lists the signal assignments on that connector. Tie all RESERVED pins to a 10 k
Ω
resistor tied to ground. Table 11-3 gives descriptions of these signals.
SL240 rehostable CMC cards may be installed on a custom carrier card instead of on a
Curtiss-Wright Controls PCI carrier card. This custom carrier card may use a
microcontroller to access the SL240 CMC card’s register set. If a microcontroller is
used, all pins listed in Table 11-2 must be used. However, access to the register set is not
mandatory to transmit and receive data through the SL240 CMC card. The SL240
rehostable CMC card will also work without a microcontroller on the carrier card. If no
microcontroller is used, many of the pins listed in Table 11-2 are not used and can be
ignored or tied to a constant voltage level. The microcontroller-specific signals from
Table 11-2 are listed below.
•
MCU_PRESENT_L
•
ADS_L
•
WEN_L
•
REN_L
•
INT_L
•
SEL_L
•
AD[15:0]
•
MCLK
•
CFG[1:0]
If a microcontroller is not used, the microcontroller-specific signals should be handled
as shown below.
MCU_PRESENT_L Tie to +3.3 V through a 10k resistor
ADS_L Tie to +3.3 V through a 10k resistor
WEN_L Tie to +3.3 V through a 10k resistor
REN_L Tie to +3.3 V through a 10k resistor
INT_L Ignore. This is an output.
SEL_L Tie to +3.3 V through a 10k resistor
AD[15:0] Ignore.
MCLK Tie to ground through a 10k resistor
CFG[1:0] Tie to ground through a 10k resistor
Even if the microcontroller interface is used, the ADS_L pin should still have an external
pullup resistor. This external pullup resistor is a precaution to try to avoid the potential of
simultaneous register reads and writes to the SL240 CMC card’s FPGA if the other FPGA
deploying the microcontroller interface is powered up at the same time. It is
recommended to have the FPGA deploying the microcontroller interface initialize all of
the SL240 CMC card’s registers after all FPGAs are powered up to ensure all registers
are set to the right values.
The configuration signals affected by MCU_PRESENT_L are CRC_EN,
CLK_CFG[1:0], IGNORE_FC, and CONVERT_SYNC. If MCU_PRESENT_L is set to
‘0,’ the configuration signals from the SL240 CMC card’s register set are used. If
MCU_PRESENT_L is set to ‘1,’ the configuration signals from the P3 connector’s pins
are used.