WLAN SDIO Transport Layer
SDIO is the WLAN host interface in the DR-WLS1273L-102. This interface is a standard SDIO interface
(SDIO spec Version 2.0). The DR-WLS1273L-102 SDIO also supports the following features:
• 4-bit data bus
• Functions number 0 and 2
• Multi-Block data transfer
• The SDIO interface is used for WLAN. The WLAN block uses function 2. Function 0 is used for the
common I/O area.
WLAN MAC
The DR-WLS1273L-102 MAC implements the IEEE standard 802.11 MAC sub-layer using both dedicated
hardware and embedded firmware. The MAC hardware implements real-time functions, including access
protocol management, encryption and decryption.
WLAN Baseband Processor
The DR-WLS1273L-102 baseband processor sits between the on-chip MAC and the radio. The DR-
WLS1273L-102 baseband processor implements the IEEE 802.11a/b/g/n PHY sub-layers and has been
optimized to perform well in conditions of high multipath and noise.
WLAN RF Radio
The DR-WLS1273L-102 radio is a highly integrated Digital Radio Processor (DRP) designed for
802.11a/b/g/n applications. The DR-WLS1273L-102 RF interfaces are designed for direct, “glueless” con-
nection to single-band RF front ends for 2.4 and 5.8 GHz 802.11a/b/g/n applications.
BT Functional Blocks
The DR-WLS1273L-102 BT architecture comprises a digital radio processor and a point-to-multipoint
baseband core function. The architecture is based on a single-processor ARM core. The device includes
on-chip peripherals to enable easy communication between a host system and the Bluetooth core func-
tion.
BT HCI UART Transport Layers
The DR-WLS1273L-102 incorporates one UART module dedicated to the Host Controller Interface (HCI)
transport layer. The HCI interface is used to transport commands, events, ACL and data between the
Bluetooth device and its host using HCI data packets. The DR-WLS1273L-102 supports the following HCI
transport layers, detected automatically when communication starts:
• UART transport layer - HCI four-wire (H4) and HCI three-wire (H5)
• HCI interface has a 256 byte receive buffer
The HCI UART supports most baud rates (including all PC rates) for all fast-clock frequencies - up to a
maximum of 4 Mbps. After power-up, the baud rate is set for 115.2 kbps. The maximum baud rate devia-
tion supported is -2.5%, +1.5%. The baud rate can thereafter be changed with a VS command. The DR-
WLS1273L-102 responds with a Command Complete Event (still at 115.2 kbps), after which the baud rate
change takes place. The only parameter needed is the desired baud rate. HCI hardware includes the fol-
lowing features:
www.RFM.com
© 2012 by RF Monolithics, Inc.
Technical support +1.972.448.3700
E-mail:
tech_sup@rfm.com
Page 5 of 31
DR-WLS1273L-102 Data Sheet - 12/13/12
RFM [ RF MONOLITHICS, INC ]
