AMBA5 Bus Matrix Address Remapping and Alias Behavior in SIE-200 The AMBA5 Bus Matrix, particularly in the context of the ARM SIE-200 IP, introduces a sophisticated mechanism for address remapping and aliasing, which can be both powerful and complex. This post delves into the intricacies of how address remapping and aliasing work within the Bus…
AXI Write Strobe Signals and Their Impact on Read-Modify-Write Operations The AXI (Advanced eXtensible Interface) protocol is a widely used on-chip communication standard for high-performance embedded systems. One of its key features is the ability to perform efficient data transfers using write strobe signals (WSTRB). These signals determine which byte lanes of the data bus…
ARM Cortex-R52 Fast Models Incorrectly Writing Zeroes to Flash for BSS Section The issue revolves around the ARM Cortex-R52 Fast Models incorrectly handling the BSS (Block Started by Symbol) section of an ELF file during simulation. The BSS section, which is marked as NOLOAD in the ELF file, is intended to reserve space in RAM…
AXI4 Protocol Behavior During Write Address and Data Transfers The AXI4 protocol is designed to handle multiple outstanding transactions, ensuring that write addresses and corresponding data are processed in a specific order. When a master initiates a write transaction, the address is sent on the AW channel, and the data is sent on the W…
AXI4 Aligned Address Calculation for INCR Bursts In AXI4, the concept of an aligned address is crucial for understanding how address generation works during INCR (incrementing) burst transactions. An aligned address ensures that each subsequent transfer in a burst adheres to the alignment requirements specified by the AxSIZE signal. The AxSIZE signal defines the number…
AXI5 Data-less Write Transactions and Their Protocol Requirements The AXI5 protocol, as defined in the ARM IHI 0022 Issue K specification, introduces the concept of data-less write transactions. These transactions are unique in that they do not involve the transfer of data on the WDATA channel, yet they still require a formalized sequence of events…
HRESP Non-OKAY Response and HTRANS IDLE Transition Mechanics The ARM Advanced High-performance Bus (AHB) protocol defines a robust mechanism for handling error responses (HRESP) during data transfers. A critical aspect of this protocol is the ability of the bus manager to transition the HTRANS signal from NONSEQ to IDLE when an HRESP non-OKAY response is…
ARM CHI ReadUnique Final State: UC vs. UD and Cache Coherency Implications The ARM Coherent Hub Interface (CHI) protocol is a critical component of modern ARM-based systems, enabling efficient cache coherency and data sharing across multiple request nodes (RNs) and home nodes (HNs). One of the key transactions in the CHI protocol is the ReadUnique…
ARM Power Policy Unit Q-Channel ACTIVE Signal and Power Mode Mapping The ARM Power Policy Unit (PPU) architecture is a critical component in modern ARM-based SoCs, enabling efficient power management by controlling transitions between different power modes. The Q-Channel interface, a key part of the PPU, includes a 1-bit ACTIVE signal that plays a pivotal…
PL022 IP Association Failure with "No IP Package Associations Found" Error The issue at hand revolves around the failure to associate the PrimeCell PL022 Synchronous Serial Port (PL022) IP with the Socrates tool, specifically versions 1.82 and 1.90. The error message "No IP Package Associations have been found" is indicative of a mismatch or misconfiguration…