We took apart a PSP-2000, a new Play Station Portable (PSP) developed by Sony Computer Entertainment Inc. (SCE), and a PSP-1000, the old model (See related article). And we compared their substrates.
The substrate of the PSP-1000 is composed of the main substrate, which is mounted with a micro-controller "PSP CPU," and a sub-substrate with a wireless LAN module and connector for memory sticks.
The substrate of the PSP-1000 (top side). The sub-substrate is mounted with a wireless LAN module (silver part of the right substrate).
The substrate of the PSP-1000 (under side). There are few LSIs on the back of the main substrate. A connector for memory sticks is seen on the sub-substrate.
In PSP-2000, a wireless LAN module and a connector for memory sticks are embedded on the main substrate. On the sub-substrate, there are only some terminal ports for external outputs, which the PSP-1000 does not have, and the terminal ports for headsets.
The main substrate of the PSP-2000 (top side). A wireless LAN module is embedded on the right side of the main substrate.
The main substrate of the PSP-2000 (under side). A connector for memory sticks is on the left side of the main substrate.
The dimensions of the wireless LAN modules equipped in the PSP-1000 and PSP-2000 are 20 × 25 mm and 11 × 16 mm, respectively. The package area was diminished by about 65%. In the PSP-1000, the LSI for wireless LAN is composed of two chips, one for base band and another for radio frequency. In the PSP-2000, one chip has both functions.
The wireless LAN modules of the PSP-1000 (top) and PSP-2000 (bottom). The package area was diminished by about 65%.
The weight of the substrates (main substrate and sub-substrate combined) in the PSP-1000 is 31 g, and that in PSP-2000 is 24 g, 7 g lighter.
Micro-controller and 64MB memory in 1 chip
When comparing the two substrates, we noticed that a memory is not directly connected near the micro-controller of the PSP-2000. In the PSP-1000, the micro-controller "CXD2967GG" and the MCP (multi-chip package) "K5E5658ACM," which contains both a flash memory and synchronous DRAM developed by Samsung Electronics Co. Ltd. of Korea, are directly connected.
In the PSP-2000, the functions of the micro-controller and 64MB memory are apparently packaged in one chip. The square measures of the micro-controllers in the PSP-1000 and PSP-2000 are the same (17 × 17 mm), but the micro-controller in the PSP-2000 is twice as thick as that in the PSP-1000. Therefore, we assume that the micro-controller in the PSP-2000 incorporates a memory.
By wires of equal length, the micro-controller in the PSP-1000, "CXD2967GG" (top), is connected to the MCP "K5E5658ACM," which contains both a flash memory and synchronous DRAM developed by Samsung Electronics Co. Ltd. of Korea.
The micro-controller in the PSP-2000, "CXD2975BGG" (top), presumably incorporates a 64MB memory.