External Memory Interface (Emi); Spi Interface; Spi Eeprom - Analog Devices ADSP-21992 EZ-KIT LITE System Manual

External Memory Interface (EMI)

A 64K x 16-bit SRAM IC (
face (EMI) of the ADSP-21992 EZ-KIT Lite board.
Sockets are provided on the ADSP-21992 EZ-KIT Lite board so that the
EMI can also be connected to two 512K x 8-bit flash memory ICs (
). These Flash memory ICs are connected to the boot memory select pin
U6
( ) and the memory select 0 pin (
BMS
boot the DSP as well as store information during normal operation.
8-bit-wide (and 16-bit, if implemented in boot ROM) booting is possible.
Refer to "Memory Map" on page 2-3
of the flash memory in the DSP's memory map.
Jumpers are provided to allow mapping RAM into different banks. A
two-nput AND gate with a jumper allows mapping the Flash memory into
boot memory space or
All address, data, and control signals are available externally on a connec-
tor. The pin-out of the EMI connector (
schematics in the Appendix.

SPI Interface

The SPI signals (

SPI EEPROM

A socket for an 8-pin SPI Serial EEPROM (64K x 8-bit), such as the
Microchip 25LC640, is provided on the ADSP-21992 EZ-KIT Lite
board, for booting and/or data storage. The
ADSP-21992 is used to select the SPI Serial EEPROM to be active on the
SPI interface. Jumper
pin of the ADSP-21992 is being used as a programmable flag pin.
SPISEL1
ADSP-21992 EZ-KIT Lite Evaluation System Manual
) is provided on the External Memory Inter-
U8
.
MS0
, , and
MISO MOSI SCK
is used to disable the EEPROM when the
JP14
EZ-KIT Lite Hardware Reference
), allowing the Flash memory to
MS0
for information about the location
) can be found in the
P3
) are available on connector
/
PF1 SPISEL1
and
U5
.
P7
pin of the
/
PF1
3-7