Some news from real samples. The RAM in the big RAM chips is overlapping. Read below...
M. ----- Forwarded message from michelqv <mic...@q.........> ----- Date: Sat, 28 Feb 2004 17:15:59 -0000 From: "michelqv" <mic...@q...........> Reply-To: [email protected] To: [email protected] Subject: [msp430] Re: 1611 RAM overlapping? Indeed. Now that I finally got my hands on a 1611 sample, I understand the TI "documentation" relating to the RAM map for F161x. The lower RAM is indeed mapped into the upper RAM area, so that the actual RAM usable by the C compiler really starts at 0x1100, and is contiguous. For the 1610, this means: RAM: 0x1100 to 0x24FF, with the first 2K bytes mirrored at 0x200 through 0x9FF For the 1611: RAM 0x1100 to 0x38FF, with the first 2K bytes mirrored at 0x200 through 0x9FF Michel --- In [email protected], onestone <onest...@b...> wrote: > Paul Curtis wrote: > > The first 2K of the big RAM bank is mirrored into the 2K of standard RAM > > at 0200 on each device. This is the most sensible choice that could > > have been made. > > Why is this sensible? since the memory addressing limit of 64k has not > been breached why wouldn't Ti use both RAM areas to give 12K. It would > make more sense to have the 2K module and an 8k module, since they > appear to be stuck with data flash at 1100H. > > Al > > > > > I've no idea what the TI DLL tells you, it seems to be wrong and have > > gone through various incarnations. We don't need to use it, luckily. > > > > Regards, > > > > -- Paul. > > > > > >>-----Original Message----- > >>From: michelqv [mailto:mic...@q...] > >>Sent: 27 February 2004 18:44 > >>To: [email protected] > >>Subject: [msp430] Re: 1611 RAM overlapping? > >> > >> > >>I asked TI Germany the same question this morning , because their > >>newly released DLL gives this 0x38FF number also, which seems wrong. > >>(Should be 30FF?) > >>All 161x chips have a "first RAM area" between 0x200 and 0x9FF, and a > >>second memory area starting at 0x1100 to complete the RAM. > >>For the 1612, the dll says that the second RAM area is from 0x1100 to > >>0x24FF, > >> and the main memory starts at 0x2500. > >> > >>We will release a new version of AQ430 early next week to support the > >>new chips, but we need some clarification on this memory size first. > >> > >>Michel > >> > >> > >>--- In [email protected], Matthias Weingart <msp...@p...> wrote: > >> > >>>Due to the datasheet, there are actually more than 10k RAM in the > >> > >>1611 > >> > >>>address space: > >>> > >>>0000h-000fH SFR > >>>0010h-00ffH 8bit per. > >>>0100h-01ffh 16bit per. > >>>0200h-09ffh RAM 2k <-############ > >>>0A00h-0bffh gap 512 bytes > >>>0C00h-0fffh ROM 1k > >>>1000h-10ffh flash 256bytes > >>>1100h-38ffh RAM 10k <-############ > >>>3900h-3fffh gap 1792 bytes > >>>4000h-ffffh flash > >>> > >>>Does the range at 200h map into the RAM at 1100h? How? The > >> > >>datasheet is not > >> > >>>clear (it states that 1100h-38ffh is 8k, what is obviously wrong). > >>> > >>>How is the address space in the 1612 assigned? > >>> > >>> Matthias > >>
