VisualDSP++ 4.5 Loader and Utilities Manual - Analog Devices

ADSP-2126x/2136x/2137x Processor Booting
The parallel port DMA channel is used when downloading the boot kernel
information to the processor. At reset, the DMA parameter registers are
initialized to the values listed in Table 5-3.
Table 5-3. Parameter Register Settings for PROM Boot Mode
Parameter Register Initialization Value Comment
PPCTL 0x0000 016F See Table 5-2.
IIPP 0 for ADSP-2126x processors
0x10000 for ADSP-2136x processors
Packing Options for External Memory
This is the offset from internal
memory normal word starting
address of 0x80000.
ICPP 0x180 (384) This is the number of 32-bit words
that are equivalent to 256 instructions.
IMPP 0x01
EIPP 0x00
ECPP 0x600 This is the number of bytes in
0x100 48-bit instructions.
EMPP 0x01
For the ADSP-2126x and ADSP-21362/21363/21364/21365/21366 processors,
the external memory address ranges are 0x2000000–0x3FFFFFF. For
the ADSP-21367/21368/21369 and ADSP-2137x processors, the external
memory address ranges are 0x1000000–0x2FFFFFF.The parallel port automatically
packs internal 32-bit words to either 8-bit or 16-bit words for
external memory. These are the only widths supported. The WIDTH() command
in the linker specifies which packing mode should be used to
initialize the external memory: WIDTH(8) for 8-bit memory, and WIDTH(16)
for 16-bit memory.
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