What is AHB APB bridge?
AHB-APB bridges are slaves on the AHB bus synchronizing the time domains of the high-speed AHB bus with the lower speed clocks used by the peripherals. Read/write authentication functions between the CPU and peripheral register are performed by the AHB-APB bridges.
Why is APB bridge to AHB?
It is required to bridge the communication gap between low bandwidth peripherals on APB with the high bandwidth ARM Processors and/or other high-speed devices on AHB. This ensures that there is no data loss between AHB to APB or APB to AHB data transfers.
What is APB and AHB?
Both Advanced Peripheral Bus (APB) and Advanced High-performance Bus (AHB) are part of Advanced Microcontroller Bus Architecture (AMBA) which is a set of interconnect specifications from ARM that sets protocols for effective on-chip communication between IPs and thereby ensuring high-performance SOC Design.
What is the role of APB bridge?
The 32 bit AMBA ASB APB Bridge provides an interface between the Advanced System Bus (ASB) and the Advanced Peripheral Bus (APB). The bridge is designed to respond to transaction requests from the currently enabled ASB master. The ASB transactions are converted into APB transactions.
What is APB interface?
About the APB protocol The Advanced Peripheral Bus (APB) is part of the Advanced Microcontroller Bus Architecture (AMBA) protocol family. It defines a low-cost interface that is optimized for minimal power consumption and reduced interface complexity.
What is AMBA protocol?
The Advanced Micro controller Bus Architecture (AMBA) bus protocols is a set of interconnect specifications from ARM that standardizes on chip communication mechanisms between various functional blocks (or IP) for building high performance SOC designs.
What is APB stm32?
Advanced Peripheral Bus (APB) APB is designed for low bandwidth control accesses, for example register interfaces on system peripherals. This bus has an address and data phase similar to AHB, but a much reduced, low complexity signal list (for example no bursts).
What is difference between AHB and APB?
When talking of the difference between the two, the AHB uses a full duplex parallel communication whereas the APB uses massive memory-I/O accesses. Both the AHB and the APB are on chip Bus standards. The Advanced High-performance Bus is capable of waits, errors and bursts.
What is AHB and APB in stm32?
AHB (Advanced High-performance Bus) APB ( Advanced Peripheral Bus)
Why do we need an ahb2apb bridge?
AHB2APB Bridge interfaces AHB and APB buses. It is required to bridge the communication gap between low bandwidth peripherals on APB with the high bandwidth ARM Processors and/or other high-speed devices on AHB. This is to ensure that there is no data loss between AHB to APB or APB to AHB data transfers.
How does APB interfacing with AHB transfer work?
Decodes the address obtained from AHB transfer and generates the peripheral select PSELx on APB Bus. The APB slave interface is very flexible. For a write transfer the data can be latched at the following points:
What is the role of the Amba APB bridge?
AMBA APB provides the basic peripheral macro cell communications infrastructure as a secondary bus from the higher bandwidth pipelined main system bus.
When does transfer start on the AHB bus?
While PADDR is used to determine which register should be read. Transfer starts on the AHB bus at T1 and address is sampled by APB Bridge at T2. If transfer is for peripheral bus, address is broadcasted on the bus and appropriate PSELx is generated.