TOPSTREAM™ WLAN

In order to realize the mobile phone which was equipped with the IP phone function by wireless LAN, such as a hot spot, in addition to access to a mobile phone network, it is necessary to realize the Wi-Fi function which needs the operation throughput of 3,000 or more MIPS by SoC of power consumption of 100 mW or less.

TOPSTREAM WLAN uses a scalable multi-core platform, and is IEEE-802.11 MAC for mobile phone-oriented wireless LAN, and it is IP for the multi-cores SoC designed to IEEE-802.11b baseband processing. In order to reduce the power consumption by the data transfer and signal-processing operation on an internal bus, sign magnitude expression is used for I/Q signal processing by the matched filter or a 128-bitSIMD processor. As a result, the processor of four different kinds was combined and the wireless LAN function by 802.11b is realized by the clock frequency of 50 MHz, and 100 mW of power consumption.

TOPSTREAM™ WLAN IP configuration
　○TS-ISIM for WLAN multi-core ISS　(c++, Tck/Tk, or Qt)
　○TOPSTREAM™ WLAM (VHDL source code)
　　・ MC : 32-bit RISC core for control + cache memory
　　・ WPE : 32-bit + 128-bit processor core for baseband processing
　　・ RPE : 32-bit processor core for packet processing
　　・ SPE : 32-bit processor core for security processing
　　・ DM ： memory for on-chip data
　　・ IM ： memory for on-chip instruction
　　・ TOPSTREAM™ bus：On-chip bus (line 3: I-bus, D-bus, D-bus)
　　・ Bus Bridge : AMBA APB bridge + Inter-processor communication unit
　　・ On-chip peripheral ：Host Interface, SD Card I/F(optional)
　　・ TOPS_LIB ：RTL component library