PRELIMINARY
CYW54907
7.2.8 MAC-PHY Interface
The MAC-PHY interface consists of a data path interface to exchange RX/TX data from/to the PHY. In addition, there is an
programming interface that can be controlled either by the host or the PSM to configure and control the PHY.
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7.3 IEEE 802.11 a/b/g/n/ac PHY
The CYW54907 WLAN digital PHY complies with IEEE 802.11a/b/g/n single-stream specifications to provide wireless LAN connec-
tivity supporting data rates from 1 Mbps to 433.3 Mbps for low-power, high-performance, handheld applications.
The PHY has been designed to work in the presence of interference, radio nonlinearity, and various other impairments. It incorporates
optimized implementations of filters, FFTs, and Viterbi-decoder algorithms. Efficient algorithms have been designed to achieve
maximum throughput and reliability, including algorithms for carrier sensing and rejection, frequency/phase/timing acquisition and
tracking, and channel estimation and tracking. The PHY receiver also contains a robust IEEE 802.11b demodulator. The PHY carrier-
sensing algorithm provides high throughput for IEEE 802.11b/g hybrid networks with Bluetooth coexistence.
The key PHY features include:
■ Programmable data rates from MCS0–7 in 20 MHz and 40 MHz channels.
■ Support for Optional Short GI and Green Field modes in TX and RX.
■ TX and RX LDPC for improved range and power efficiency.
■ All scrambling, encoding, forward error correction, and modulation in the transmit direction and inverse operations in the receive
direction.
■ Support for IEEE 802.11h/k for worldwide operation.
■ Advanced algorithms for low power consumption and enhanced sensitivity, range, and reliability.
■ Algorithms to improve performance in the presence of externally received Bluetooth signals.
■ An automatic gain control scheme for blocking and nonblocking cellular applications.
■ Closed loop transmit power control.
■ Digital RF chip calibration algorithms to handle CMOS RF chip process, voltage, and temperature (PVT) variations.
■ On-the-fly channel frequency and transmit power selection.
■ Per-packet RX antenna diversity.
■ Available per-packet channel quality and signal-strength measurements.
■ Compliance with FCC and other worldwide regulatory requirements.
Document Number: 002-19312 Rev. *C
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CYPRESS [ CYPRESS ]
