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BCM4318EKFBG Datasheet(PDF) 11 Page - Cypress Semiconductor |
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BCM4318EKFBG Datasheet(HTML) 11 Page - Cypress Semiconductor |
11 / 54 page Preliminary Data Sheet BCM4318/BCM4318E 11/09/04 Broadcom Corporation Document 4318_4318E-DS01-405-R Section 1:Functional Description Page 3 Figure 2: IEEE 802.11a/g MAC Block Diagram The host interface consists of registers for controlling and monitoring the status of the MAC core and interfacing with the TX/RX FIFOs. There are four transmit FIFOs: asynchronous, priority, Broadcast/Multicast (BC/MC) and ATIM. Each transmit FIFO is 3-KB deep. In addition to the transmit FIFOs, there is a 1-KB template area for response frames. Whenever the host has a frame to transmit, the host queues the frame into one of the transmit FIFOs with a TX descriptor containing TX control information. The PSM schedules the transmission on the medium depending on the frame type, transmission rules in IEEE 802.11 protocol, and the current medium occupancy scenario. After the transmission is completed and an ACK is received, a TX status is returned to the host confirming the same in the TX status FIFO. The MAC contains a single 4.5-KB RX FIFO. Whenever a frame is received, the frame is sent to the host along with an RX descriptor that contains additional information about the frame reception conditions. The Power Management block maintains the information regarding the power management state of the core (and the associated STAs in case of an AP) to help in dynamic decisions by the core regarding frame transmission. The WEP block performs the required WEP operation on the TX/RX frames. The WEP block supports separate transmit and receive keys with four shared keys and 50 link-specific keys. The link-specific keys are used to establish a secure link between any two STAs, with the required key being shared between only those two STAs, hence excluding all the other STAs in the same network from deciphering the communication between those two STAs. The WEP block supports the following encryption schemes that can be selected on a per-destination basis: • None: the WEP block acts as a pass-through • WEP: 40-bit secure key and 24-bit IV as defined in IEEE Std 802.11-1999 Host Interface (Host Registers) N TX FIFOs Template 1 RX FIFO WEP / AES Encryption Power Management Programmable State Machine (PSM) Data Memory Code Memory Timing and Control PHY Interface TX Status FIFO TX Engine RX Engine |
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