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MMDSP Debugger 1 2

Memory Classes

The following DSP specific memory classes are available.

The Video core STN8810V uses a dictionary for compressing its program memory. When writing code to the

program memory (e.g. by downloading a program to the target via Data.LOAD.Elf or by writing to a P:

memory location), the debugger automatically adds necessary dictionary entries derived from the written

program data. This is hidden from the user, who accesses program memory always in 64bit words (one

VLIW instruction). The compressed program and dictionary memories can be accessed via the DBG:

memory class (see below). Downloading a program to the target via Data.LOAD.Elf deletes the old

dictionary and therefore may invalidate instructions, even if their are not physically overwritten by the new

program.

The DBG memory class gives access to memory resources like host register, indirect host registers, and

dictionary ram (Video core only). The mapping of these resources to addresses is arbitrary and does

not relate to any MMDSP or system address mappings. The mapping is only valid in the context of the

DBG memory class.

To access a memory class, write the class specifier in front of the address:

For accessing indirect host registers (DBG: 0x1000--0x1FFF), the 64-bit access width needs to be specified:

Memory Class Description

PProgram Memory

X Data Memory (X-Bus)

Y Data Memory (Y-Bus)

DBG Debug Memory

Address Range Mapped Resource

DBG: 0x0000--0x007f host registers, 8-bit width

DBG: 0x1000--0x1FFF indirect host registers, up to 64-bit wide

DBG: 0x2000--0x5FFF dictionary memory, 53-bit wide (Video)

DBG: 0x6000--*: compressed instructions, 24-bit wide (Video)

Data.dump p:0--3

d.in dbg:0x1015 /quad

print data.quad(dbg:0x1015)

d.out dbg:0x1015 %quad 0x1122334455667788

Lauterbach MMDSP User Manual

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