高通QCA9882 802.11ac Wi-Fi芯片技术手册
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更新于2024-07-16
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"高通QCA9882是一款针对802.11ac标准的双频2x2 MIMO无线局域网（WLAN）系统级芯片（SoC）。这款芯片旨在提供高性能的无线连接，支持更快的数据传输速度和更稳定的网络连接。文档可能包含了关于QCA9882的详细规格、功能特性、接口说明、配置指南以及应用示例等内容，但具体内容未在摘要中列出。由于文档被标记为机密和专有，不得在公共平台披露，并且其分发和使用受到严格限制，需遵循高通公司的授权政策。"
高通QCA9882是一款高性能的无线网络解决方案，主要用于实现802.11ac Wi-Fi标准。802.11ac是Wi-Fi联盟认证的一个无线局域网标准，相比于之前的802.11n，它提供了更高的数据传输速率，通常可达到1 Gbps以上，最高可达1.3 Gbps，使得无线网络的性能接近有线以太网的速度。QCA9882作为一款2x2 MIMO（多输入多输出）芯片，意味着它可以同时发送和接收两个独立的数据流，从而提高数据传输效率和网络稳定性。
MIMO技术通过使用多个天线来增强无线信号，通过空间多工和空间分集增加吞吐量和可靠性。QCA9882支持双频操作，意味着它可以工作在2.4 GHz和5 GHz两个频段，2.4 GHz频段适合覆盖更广的区域，而5 GHz频段则提供更低的干扰和更高的数据速率。这种设计使得QCA9882能够在家庭、办公室或公共场所提供灵活且高效的无线连接。
QCA9882 SoC集成了处理器、内存、射频（RF）组件和基带处理单元，这些都封装在一个单一的芯片上，减少了硬件设计的复杂性和成本。此外，它可能还具备功耗管理功能，以便在保持高性能的同时，降低设备的能耗。
这款芯片的使用不仅限于路由器和接入点，还可以用于其他需要高速无线连接的设备，如智能电视、游戏设备、移动设备等。然而，由于文档的保密性质，我们无法获取到关于具体功能特性的详细信息，如射频性能、电源管理策略、安全特性、以及与主机系统的接口等。
高通QCA9882是无线通信领域的重要组成部分，它为实现高效、可靠的802.11ac无线连接提供了强大的硬件基础。对于开发者和工程师而言，了解并掌握这款芯片的特性和用法，将有助于优化他们的产品设计，提升用户体验。但鉴于文档的保密性，实际操作和学习应遵循高通公司的规定和授权。
80-Y0962-1 Rev. B 16 Confidential and Proprietary - Qualcomm Atheros, Inc.
MAY CONTAIN U.S. AND INTERNATIONAL EXPORT CONTROLLED INFORMATION
QCA9882 Dual-Band 2x2 MIMO 802.11ac/abgn WLAN SoC Data Sheet Functional Specification
The QCA9882 is comprised of several internal functional blocks, as summarized in Table 3-1.
Table 3-1 Functional blocks
Block Description
AXI The AXI bus is accessed simultaneously by multiple masters in the PCIE host memory, CPU
memory, and all programmable registers. The WLAN portion of the AXI fabric supports split
transactions to achieve higher utilization on the PCIE bus.
All register access from the CPU route through the AXI fabric. A bridge converts AXI requests
to AHB requests, and the AHB arbiter selects between PCIE register access requests and
CPU register access requests on a round-robin basis. All register accesses for all modules
including the MAC, CE, and blocks such as GPIOs, RTC, or OTP use the APB protocol. A
bridge converts AHB requests into APB. It must be noted here that the entire AXI fabric, AHB,
and APB interfaces all run synchronously on the SoC clock domain. See AXI.
CE The copy engine (CE) establishes a communication channel between the firmware and the
host. It performs a DMA copy from one memory location (source memory) to another memory
location (destination memory), and it can perform this DMA copy operation in a batch, under
control of software. A copy involves a read operation from the source memory, followed by a
write operation to the destination memory.
WLAN Clocking The MAC/baseband clock domain runs off of the WLAN PLL. The PLL runs at either at
160 MHz or 176 MHz. The CPU/SoC clock domain runs off of the CPU PLL. The AXI fabric
together with the AHB and APB buses typically run at either half or quarter CPU clock. The
PCIE clock domain runs at 125 MHz.
CPU Core and
Memory Controller
The CPU is a Tensilica XTENSA 7.0 processor with a hardware abstraction layer (HAL) to
support low level WLAN activity with minimal support from the PCIE host.
The CPU is configured with a peripheral interface (PIF). The outbound PIF is used by the CPU
for register access. The inbound PIF is used by the other AXI masters (MAC and CE) to
access the data memory (DMEM) connected to the CPU.
MAC/Baseband/RF The integrated 2.4/5 GHz 802.11n 2x2 MAC/baseband/radio includes the 802.11n features of
maximal likelihood (ML) decoding, low-density parity check (LDPC), and maximal ratio
combining (MRC). The MAC includes a offload engine (OLE) block responsible for A-MSDU
scatter and gather, L2 header encapsulation and decapsulation, IP/TCP/UDP checksum, and
Rx classification.
PCIE Core All programmable registers can be accessed by either the PCIE host or by the internal CPU.
The PCIE core provides a simple proprietary low-bandwidth controller (LBC) interface for
register accesses.
PCIE Configuration
Space Registers
The QCA9882 PCIE configuration space maps to the host memory space. All programmable
registers can be accessed either by the PCIE host or by the internal CPU. The PCIE core
provides a simple proprietary low-bandwidth controller (LBC) interface for register accesses. A
bridge converts this LBC interface into standard AHB. An AHB-AHB bridge synchronizes the
clock domain from the PCIE clock domain to the SoC clock domain.
Some additional registers are accessible only by the PCIE host. These registers run on the
PCIE clock domain and are not routed through the main AHB arbiter. They allow the PCIE host
to determine the sleep status of the SoC and to wake up the SoC if needed. See PCIE
configuration space register descriptions
.
WLAN AHB Arbiter Selects between the PCIE register access requests and CPU register access requests on a
round-robin basis.
WLAN GPIOs All digital pins map to 16 GPIOs. These GPIOs are used for a variety of purposes such as BT
coexistence, UART, I
2
C, SPI, JTAG. Another set of digital outputs are the four antenna
switches used as scan outputs during ATPG testing. The 16 GPIOs are divided into GPIOs
dedicated to BT and to WLAN, 8 to BT and 8 to WLAN. See GPI/GPIO.
WLAN OTP WLAN one-time programmable (OTP) memory
WLAN RTC The RTC block controls the clocks and power going to other modules within the chip. Its inputs
consist of sleep requests from these modules and its outputs consists of clock enable signals
used to gate the clocks going to these modules. The RTC block also manages resets going to
other modules within the device.
Qualcomm Atheros Confidential
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