ADSP-21992 EZ-KIT Lite Evaluation System Manual
4-39
4.3.13 External FLASH Memory Enable Jumper, JP31
Sockets are provided on the ADSP-21992 EZ-KIT Lite board to connect the External Memory
Interface to two 512K x 8-bit flash memory ICs (U5, U6). These flash memory ICs are
connected to the boot memory select (
BMS
) pin, or to the memory select 0 pin (
MS0
) via a 2-input
AND gate. Jumper JP31 is placed on the
MS0
line to disconnect the
MS0
pin if required.
4.3.14 External SRAM Enable Jumpers, JP24 – JP27
A 64K by 16-bit SRAM IC (U8) is provided on the External Memory Interface (EMI) of the
ADSP-21992 EZ-KIT Lite board. External memory space consists of four memory banks. The
MS3 – MS0
memory bank pins select banks 3-0, respectively. JP24 – JP27 map the external
SRAM to
MS0
,
MS1
,
MS2
, or
MS3
.
NOTE:
If using external SRAM, only
one
of these 2-pin jumpers should be CLOSED at any one
time.
4.3.15 Encoder Interface Jumpers, JP28 – JP30
The ADSP-21992 EZ-KIT Lite board allows you to apply differential encoder signals to the
board at the encoder interface connector (EIU), P6. A differential line receiver IC, A8, is
provided to convert the differential encoder signals to single-ended signals for the EIU inputs of
the ADSP-21992. Three 2-pin jumpers, JP28 – JP30, are provided to enable this encoder interface
circuitry. It is also possible to apply encoder signals directly to the Encoder Interface of the
ADSP-21992 at these jumpers, when they are OPEN (i.e., no shunt installed).
4.3.16 CAN Interface Jumpers, JP22 – JP23
A CAN transceiver (U2) is provided on the CAN interface. JP22 can enable (2-3 position) or
disable (1-2 position) the sleep mode on the CAN transceiver. If no shunt is present, this mode
can be defined by external circuitry. Connectors P12 and P13 provide connections to the user’s
CAN bus and allow easy daisy-chaining of CAN devices. CAN bus termination of 120
Ω
is
provided by closing jumper JP23.
