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Architecture
2.1 System Architecture
The LA-5137 is a modified type 1 CFA card. The LA-5137 Compact Flash Adapter CF card consists of all of the
integrated circuits necessary to provide WLAN transceiver functionality for the 2.4GHz and 5 GHz bands. The
Wireless LAN integrated Media Access Controller with Baseband processor directly interfaces with the Dual
Band Direct Conversion transceiver. With the addition of RF Front-end Module (FEM), the LA-5137 Compact
Flash Adapter card incorporates the WLAN chip set solution compliant with 802.11a/b/g standards.
Figure 2.1 Top-level LA-5137 CF Card architecture
The 40MHz crystal controlled clock provides the necessary clocks for both the PLL and the baseband & MAC
chip. The SDRAM provides additional memory to support SHoC (Self Hosted Client) operation. Not shown in
Figure 2.1
are the necessary voltage regulators that provide various supply voltages for the chips. The
regulators require 3.3V input supply.
The EEPROM is used to hold radio information including radio calibration information done at the automatic
manufacturing test step.
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