ADSP-21992 EZ-KIT Lite Evaluation System Manual
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4.3.8 AUXPWM Trip Jumper, JP8
Connecting jumper JP8 in the 2-3 position ties the
AUXTRIP
pin of the ADSP-21992 to VDD
and enables AUXPWM outputs. In this case, the
AUXTRIP
pin of the ADSP-21992 can be
defined by external circuitry, via the PWM connector, P10. Alternatively, connecting jumper JP8
in the 1-2 position connects the
AUXTRIP
pin of the ADSP-21992 to GND, thereby permanently
disabling AUXPWM outputs. A third alternative is to leave JP8 unconnected. Again, in this case,
the
AUXTRIP
pin of the ADSP-21992 is connected to the PWM connector, P10, so that its value
can be defined by external circuitry.
4.3.9 Boot Mode and Bypass Mode Select Jumpers, JP9–JP12
The ADSP-21992 supports different boot modes that are controlled by the three dedicated
hardware boot mode control pins (BMODE2, BMODE1, and BMODE0). These modes can be
selected by the configuration of the three 2-pin jumpers, JP9-JP11. The default setting for these
three 2-pin jumpers is OPEN, whereby no boot mode is selected.
The DSP provides a user-programmable (1x to 32x) multiplication of the input clock, including
fractional values, to support 128 external-to-internal (DSP core) clock ratios. The BYPASS pin,
MSEL6–0, and DF bits in the PLL configuration register, specify the PLL multiplication factor at
reset. When JP12 is CLOSED, BYPASS mode is selected (default).
4.3.10 SPI EEPROM Enable Jumpers, JP13 and JP14
A socket is available on the ADSP-21992 EZ-KIT Lite board for an 8-pin SPI Serial EEPROM,
such as the Microchip 25LC640, which is used for booting and/or data storage. JP13 and JP14 are
used to enable the SPI EEPROM. It is decoded at SPI slave select 1 via JP14. JP13 is used to
enable/disable the write protection pin of the SPI EEPROM.
4.3.11 DAC Enable Jumpers, JP15 and JP16
JP13 and JP14 enable the 8-channel, serial, 12-bit DAC on the ADSP-21992 EZ-KIT Lite board.
The DAC is decoded at SPI slave select 2, via JP15. PF3 is used to update the DAC register via
JP16.
4.3.12 Serial Port / UART Circuitry Jumpers, JP17–JP21
Jumper JP17 connects the transmit clock of the serial port to the receive clock of the Serial port.
Jumpers JP18 – JP21 are used to configure the UART circuitry on the ADSP-21992 EZ-KIT Lite
board. JP18–JP20 to enable the UART circuitry, and JP21 enables the required loopback in the
UART circuitry.
