sorry I just too busy the last semester,I'll do the replacement one week later,and now I'm trying to buy the memory chips.
would MT47H64M16HR-3IT be fine? thx~ trag於 2012年11月16日星期五UTC+8上午6時13分41秒寫道： > > > > On Wednesday, November 14, 2012 11:47:32 PM UTC-6, willx wrote: >> >> >> I think it's not a jack connection problem,my ATV will show the RTL >> enternet card when I type lspci,but if i type ifconfig,there is no eth0. >> I have 3 ATV, the other two will show eth0 even if there is no enternet >> cable plugged in >> and I have decided to use that one as victim~ >> here I'm in China,and a second-hand DDR2 ram is more cheap,for a 1GB one >> with 8 chips,only costs about USD$8,so my question is, how to figure out >> the chip on the ram is fit or not >> > > Other than simple things,I'm out of ideas for the ethernet. I would > double check the power supplies to the RTL8100. Pins 3, 7, 20, 26, 41, 56, > 71, 84, 94 and 107 should be at 3.3V. Pins 12, 32, 54, 78 and 99 should > be at 2.5V. Also, double check your soldering. Exam the chip visually > under magnification. If you have the patience, check the continuity > between the pins where they enter the chip body and the associated pads, > and neighboring pads. > > Regarding the RAM, I do not think that you can salvage the necessary RAM > from a DIMM. The RAM chips on DIMMs are either 4 bits wide or sometimes 8 > bits wide. The ATV1 uses four 16 bit wide memory chips. > > Using Micron as an example.... Micron makes DDR2 memory chips in three > capacities, 512 Mbit, 1 Gbit, and 2 Gbit. But each of those total > capacities is manufactured in three organizations. The memory chip may be > 4 bits wide, 8 bits wide or 16 bits wide. > > So, a 512 Mbit chip which is 4 bits wide has 128M addresses. 8 bits wide > gives 64M addresses. 16 bits wide gives 32M addresses. The latter is > what was used in the ATV1. > > The Micron part number for 16 bit wide, 1 Gbit and 2 Gbit chips are, > respectively: MT47H64M16 and MT47H128M16. > > Note the trailing 16 in the part number and the 64 and 128 in the middle > of the part number. 64M X 16 bits. 128M X 16 bits. > > There are additional characters after the 16 in a real part number, > denoting package type, speed, temperature range, and revision. Anything > as fast or faster than 3.75ns should be fine (-37E or faster). I think > that -25 or -25E is much more common now days. > > The package will be 84 ball FBGA. The 60 ball package does not have > enough pins to support the 16 bit width (16 data pins needed). > > The writing on the package will not use the above part numbers. You need > to use the Micron FBGA Decoder > Micron FBGA Decoder <http://www.micron.com/products/support/fbga> > > to translate between the part number written on the actual package and the > long part numbers discussed above. > > If you do not have them, get the datasheets from Micron for 1 Gbit and 2 > Gbit DDR2 memory. Looking over the datasheet helps a lot. > > BTW, I recently investigated a little further into the possibility of > replacing the RTL8100 with the RTL8110 or maybe 8111. One of those has a > version for which RealTek's literature claims it is pin compatible with the > RTL8100. However, while the chips are "pin compatible" the 8110 uses > several of the NC pins on the 8100 as new power pins for 1.8V and > additional connections to the RJ45 jack are required. One could drop in > the more capable chip, but one would have to run a bunch of rework wires to > various pins to get it functioning. > > Interesting about the extra VRAM. I missed that. > -- -- To post to this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/atv-bootloader?hl=en --- You received this message because you are subscribed to the Google Groups "atv-bootloader" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
