Analog Devices ADDS-21992-EZLITE, Руководство пользователя

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ADSP-21992 EZ-KIT Lite Evaluation System Manual
3-26
The ADSP-21992 EZ-KIT Lite board provides 512K x 8 bits of external flash memory. 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 (U1). Jumper JP31 is placed on the MS0 line to disconnect the
MS0 pin if required. The flash memory can be accessed in either the boot memory space or the
external memory space,.
If booting from the external flash memory IC, JP31 can be left open. In this case, the external
SRAM provided on the ADSP-21992 EZ-KIT Lite board can be mapped to any of the external
memory banks using one of the jumpers, JP24 – JP27.
If not booting from the flash memory, but using it as external program or data memory, JP31
must be closed. In this case the external SRAM provided on the ADSP-21992 EZ-KIT Lite board
should not be mapped to external memory bank 0 (JP24 should be open in this case) and can be
mapped to any of the other external memory banks using one of the jumpers, JP25 – JP27.
When using the external memories provided on the ADSP-21992 EZ-KIT Lite board, they are
mapped at the start address of the chosen external memory bank.
Table 3-1: ADSP-21992 Memory Map
Start
Address
End
Address
Page Content
0x00 0000 0x00 7FFF
0 32K x 24-Bit Program Memory
0x00 8000 0x00 BFEF
0 16K x 16-Bit Data Memory
Internal
Memory
0x00 C000 0x00 FFFF
0 RESERVED (16K)
0x01 0000 0x3F FFFF
1-63 External Memory (Bank 0)
0x40 0000 0x7F FFFF
64-127 External Memory (Bank 1)
0x80 0000 0xBF FFFF
128-191 External Memory (Bank 2)
External
Memory
(at reset)
0xC0 0000 0xFE FFFF
192-254 External Memory (Bank 3)
0xFF 0000 0xFF 0FFF
255 4K x 24-Bit Boot ROM (Internal)
Reserved
0xFF 1000 0xFF FFFF
255 RESERVED (Internal)
0x00 0000 0x00 1FFF
0-7 16-Bit Internal I/O Memory
IO Memory
0x00 2000 0x03 FFFF
8-255 16-Bit External I/O Memory
! NOTE: Although the flash starts at address 0x01 0000 in the boot memory space,
during EPROM boot the address 0x00 0000 is put on the address bus.
!
NOTE: Only 8K of program memory is available in the EZ-KIT Lite software.
3.4 Example Programs
Example programs are provided with the ADSP-21992 EZ-KIT Lite to demonstrate various
capabilities of the evaluation board. These programs are installed with the EZ-KIT Lite software
and can be found in
\…\VisualDSP\219x\EZ-KITs\ADSP-21990\Examples . Please refer to the
example program readme files for more information.