Only the new Dreambox can be the best DreamBox!
Dream-Multimedia company again delighted fans of sat tv, releasing a new product – the Dreambox dm 7020 s model. At first glance, the receiver remained the same as its previous brother in the shop. But this is not so. The upgrade affected the inside of the Dreambox. And so, let’s look inside the receiver and consider in more detail what has been changed, and also talk about the advantages and disadvantages of the new model. The motherboard is very high quality. It immediately catches the eye that the power supply was removed from it. In the Dreambox dm 7000 s, the board was made in the form of a monoblock. The processor remained unchanged – Set Top Box IBM PowerPC STB04500 series. But flash-memory has undergone a major reorganization. In the Dreambox dm 7020 s there is NAND flash of Samsung K9F6508U of 32 Mb volume. NAND technology is designed to store data on flash cards. NAND flash microchips are just one direction from a set of technologies for the manufacture of electrically erasable and programmable storage devices (Eeprom). NAND memory allows you to store large amounts of information, and its low cost and high enough speed makes it even more attractive.
At first glance, a microcircuit, like a microcircuit. But this is not so. some similarities in flash K9F2808U is a USB flash with a capacity of 16 Mb. Dream-multimedia engineers again “killed two birds with one stone”. 1- Increased the amount of flash memory. After all, everyone knows that with all kinds of emulators, plugins and add-ons stuffed, the main memory was not enough and I had to use an external USB flash 2- We made a bootloader (BootStarp) in OTP Eeprom. Since the central processor has a parallel architecture (data bus, address bus, etc.), it will not be able to start the initial boot process with a serial NAND flash. 27L512 is a one-time programmable 64 Kb memory chip. This was enough to fit the boot loader, which pulls the OS Linux kernel with NAND flash into RAM and transfers control to the kernel. Further, all the functions of reading and writing to flash are provided by the kernel of the system. Approximately according to this scheme, the multi-loader FlashWizardPro works. The cost of NAND memory is very different in a smaller direction compared to flash memory parallel organization. And then a lot of people tormented themselves with corrupted bootloaders in other dreambox models. Now we need to try very hard to disable OTP Eeprom Let’s continue. Dreambox dm 7020 s satellite receiver uses a brand new Philips tuner
The same tuner is used in the younger model – Dreambox dm 500 s. This is due to the low quality of the LG tuners that are on the DM56XX and DM7000S. The Dreambox dm 7020 s model is made with one tuner, but the 7025 will already contain two input tuners. To separate the transport streams (data), the PLM Xilinx XC9572XL chip is used (photo 7). Attention, the firmware of this chip for the Dreambox dm 7020 s model contains a stream handler from only one tuner. And besides, the LNB control circuit (photo 8) can only serve one input tuner. Probably, in the Dreambox dm 7025 there will be a slightly different layout of the printed circuit board, taking into account these innovations. Photo 9 shows the Video Selector, made on the STV6412 chip. This is a complete device that contains various switches and shapers video standards.
Front Processor is based on Atmel’s Atmega8535 chip. FP is a necessary component of the receiver. In order not to load the main processor with any routine trifle (processing remote control commands, displaying information on the LCD screen, buttons, standby mode, power management), all these functions are assigned to this small but very powerful microcontroller. The front panel connector is made using standard IDC pin connectors. It will be difficult to break it. I also want to note the excellent quality of the CompactFlash connector. In the previous model, after installing the CA card several times, the legs on this connector broke off. Another plus is the simultaneous operation of the CF and the hard drive. The jumper in photo 11 allows you to set the Master / Slave devices connected to the ATA bus. The analogue board of the modem is visible, the reverse side in photo 13. This is not relevant for us, since we do not have to order PPV programs by phone, although if you collect the PPPD package, CardsSharing fans will be able to directly use the Internet access services without a computer.
The network interface is made on a very common chip manufactured by ASIX ax88796 10/100 enternet controller. This chip has already been used on the DM5620 and DM500. On the reverse side of the motherboard there is no mounting, with the exception of capacities, filters for powering the processor. Now let’s take a look at the weak points – the front panel, namely the installation location of the LCD indicator. On the Dreambox dm 7000 s, if the top cover of the case is ineptly opened, the elastic cable is likely to break.