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Summary of Contents for Remotek WP320
- Page 1 Wireless LAN PC Card Operational Discription Wireless LAN PC Card WP320 Operational Description Version 1.0 April 2003...
- Page 2 Wireless LAN PC Card Operational Discription Copyright Statement No part of this publication may be reproduced in any form or by any means, or used to make any derivative such as translation, transformation, or adaptation as stipulated by the United States Copyright ACT of 1976.
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Page 4: Table Of Contents
Wireless LAN PC Card Operational Discription Contents 1. Introduction: ..................5 2. About RTL8180 ..................6 2.1 General Description ................6 2.2 Transmit & Receive Operations..............8 2.3 Loopback Operation................8 2.4 Tx Encapsulation..................8 2.5 Rx Decapsulation..................9 2.6 Memory Functions ..................9 2.7 LED Functions..................12 3. About SA2400 : Transceiver for 2.45 GHz ISM Band ..15 3.1 Description ..................15 3.2 Functional Blocks and Features ..............15... -
Page 5: Introduction
LAN. Using radio frequency(RF) connections. Thus, wireless LANs combine data commectivity with user mobility. Figure 1. shows a simplified block diagram of the Wireless LAN PC Card WP320. Figure 1. Wireless LAN PC Card WP320 Block Diagram... -
Page 6: About Rtl8180
Wireless LAN PC Card Operational Discription 2. About RTL8180 2.1 General Description A block diagram that is based on the RTL8180 performs the inter-networking between Ethernet and IEEE802.11b Wireless LAN is shown in Figure 2. The Realtek RTL8180 is a highly integrated and cost-effective wireless LAN network interface controller that integrates a wireless LAN MAC and a direct sequence spread spectrum baseband processor into one chip. - Page 7 Wireless LAN PC Card Operational Discription identifies hardware (i.e., the RTL8180 LAN card). The information may consist of part number, serial number, and other detailed information. The RTL8180 supports an enhanced link list descriptor-based buffer management architecture, which is an essential part of a design for a modern network interface card. It contributes to lowering CPU utilization.
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Page 8: Transmit & Receive Operations
Wireless LAN PC Card Operational Discription 2.2 Transmit & Receive Operations The RTL8180 supports a new descriptor-based buffer management that will significantly lower host CPU utilization. The RTL8180 supports up to 64 consecutive descriptors in memory for transmit and receive separately, which means there might be 5 descriptor rings. Transmit descriptor rings have one beacon transmit descriptor ring, one high priority descriptor ring, one normal priority descriptor ring and one low priority descriptor ring. -
Page 9: Rx Decapsulation
Wireless LAN PC Card Operational Discription necessary data fields of the communications protocol to establish the physical layer link. 3. The MAC frame can be configured for DBPSK, DQPSK or CCK. 2.5 Rx Decapsulation The RTL8180 continuously monitors the network when reception is enabled. When activity is recognized it starts to process the incoming data. - Page 10 Wireless LAN PC Card Operational Discription iii. Memory Read Line (MRL) command operates in conjunction with Memory Read Multiple command (MRM). RTL8180 will terminate the read transaction on the cache line boundary when it is out of resources on the transmit DMA. For example, the transmit FIFO is almost full.
- Page 11 Wireless LAN PC Card Operational Discription ;From Address:<64m+64+(16*4)*22>,<64m+64+(16*4)*22+4>,..,<64m+64+(16* 4)*22+42> Step1: Memory Read Multiple (MRM) Data: (0-3) => (4-7) => (8-11) =>… … … … .. => (1454-1467) From Address: <64m+4>, <64m+8>, … … … ., <64m+64+(16*4)*21+(16-1)*4> Step2. Memory Read(MRL) Data: (1468-1471) => (1472-1475) => … … … … … … … … … … … , => (1510-1513) From Address:<64m+64+(16*4)*22>,<64m+64+(16*4)*22+4>,..,<64m+64+(16* 4)*22+42>...
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Page 12: Led Functions
Wireless LAN PC Card Operational Discription no longer hold. Example: Assume Rx packet length = 1514 byte, cache line size = 16 DWORDs (longwords), and Rx buffer start address = 64m+4 (m > 0). Step1: Memory Write (MW) Data: (0-3) => (4-7) => (8-11) => … … … ... => (56-59) (byte offset of the Rx packet) To Address: <64m+4>, <64m+8>, …... - Page 13 Wireless LAN PC Card Operational Discription 2.7.1 Rx LED Blinking of the Rx LED indicates that receive activity is occurring. Power On LED = High Receiving Packet? LED = High for (100 +- 10) ms LED = Low for (12 +- 2) ms 2.7.2 Tx LED Blinking of the Tx LED indicates that transmit activity is occurring.
- Page 14 Wireless LAN PC Card Operational Discription 2.7.3 Tx/Rx LED Blinking of the Tx/Rx LED indicates that both transmit and receive activity is occurring. Power On LED = High Tx/Rx Packet? LED = High for (100 +- 10) ms LED = Low for (12 +- 2) ms 2.7.4 LINK/ACT LED Blinking of the LINK/ACT LED indicates that the RTL8180 is linked and operating properly.
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Page 15: About Sa2400 : Transceiver For 2.45 Ghz Ism Band
Wireless LAN PC Card Operational Discription 3. About SA2400 : Transceiver for 2.45 GHz ISM Band 3.1 Description The SA2400A is a fully integrated single IC RF transceiver designed for 2.45GHz wireless LAN (WLAN) applications. It features a direct conversion radio architecture and is fabricated in an advanced 30GHz f BiCMOS process. - Page 16 Wireless LAN PC Card Operational Discription An I/Q upconverter from base band directly to 2.45 GHz, with +18.23 dBm output power, -40dBc typical carrier leakage (calibrated) and 3 µs (typical) Rx to Tx switching time, and comprising the following: Wide band IQ modulator producing better than 14% EVM for 11 Msymbols/sec QPSK modulation Integrated reconstruction and spectral shaping filters at I and Q modulation input that is driven by an external D/A.
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Page 17: About Sa2411 : +18.23 Dbm Power Amplifier
Wireless LAN PC Card Operational Discription 4. About SA2411 : +18.23 dBm Power amplifier 4.1 DESCRIPTION The SA2411 is a linear power amplifier designed for the WLAN in the 2.4 GHz band. Together with the SA2400A the chips form a complete 802.11b transceiver. The SA2411 is a Si power amplifier with integrated matching and a possibility to adjust the linearity.The functional block diagram of SA2411 is shown in figure 4. - Page 18 Wireless LAN PC Card Operational Discription Power Detector The power detector detects the power level and transforms it into a low frequency current. The detector output must be loaded with a resistor to ground for the highest accuracy. This resistor has an optimal value of 5.6 kW. Lower values can be used to comply with maximum input sensitivity of ADC’...
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