From f22f77b22a715a7889067735c1273934825dcf5c Mon Sep 17 00:00:00 2001 From: luweike Date: Wed, 9 Jul 2025 14:33:35 +0800 Subject: [PATCH] docs: Update TCM to SPM for ESP32-P4 memory types --- docs/en/api-guides/memory-types.rst | 4 ++-- docs/zh_CN/api-guides/memory-types.rst | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/docs/en/api-guides/memory-types.rst b/docs/en/api-guides/memory-types.rst index ed69d7c6f0..87455bea14 100644 --- a/docs/en/api-guides/memory-types.rst +++ b/docs/en/api-guides/memory-types.rst @@ -189,10 +189,10 @@ The ``DRAM_ATTR`` attribute can be used to force constants from DROM into the :r .. only:: SOC_MEM_TCM_SUPPORTED - TCM (Tightly-Coupled Memory) + SPM (Scratchpad Memory) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - TCM is memory placed near the CPU, accessible at CPU frequency without passing through a cache. Even though on average, it may not surpass the efficiency or speed of cached memory, it does provide predictable and consistent access times. TCM can be useful for time-critical routines where having a deterministic access speed is important. + SPM (Scratchpad Memory) is a dedicated on-chip memory located near the processor core, offering deterministic access timing. SPM does not rely on hardware caching mechanisms; instead, its access is explicitly managed by software, ensuring predictable and stable latency. The access latency of SPM is configuration dependent. When parity check is enabled, the latency is 4 clock cycles and memory bandwidth is reduced. When parity check is disabled, the latency is 1 clock cycle. This type of memory is typically used to store critical code and data that are sensitive to access timing, making it suitable for real-time systems or embedded applications with strict performance and response time requirements. DMA-Capable Requirement diff --git a/docs/zh_CN/api-guides/memory-types.rst b/docs/zh_CN/api-guides/memory-types.rst index 4f17cbad86..fcb5e8b1c5 100644 --- a/docs/zh_CN/api-guides/memory-types.rst +++ b/docs/zh_CN/api-guides/memory-types.rst @@ -189,10 +189,10 @@ DROM（数据存储在 flash 中） .. only:: SOC_MEM_TCM_SUPPORTED - 紧密耦合内存 (TCM) + SPM（暂存内存） ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - TCM 是靠近 CPU 放置的内存，支持在 CPU 频率下直接访问，无需通过 cache。虽然在一般情况下，TCM 的效率或速度相较 cache 偏低，但是访问 TCM 所需的时间是可以预测且始终一致的。具有稳定的访问速度对于时间关键型例程来说十分重要，因此 TCM 对于此类例程而言非常有用。 + SPM (Scratchpad Memory) 是一种位于处理器核心附近的片上专用存储器，具备确定性的访问时序。SPM 不依赖硬件缓存机制，访问由软件显式管理，访问延迟可预测且稳定。具体访问延迟可能受硬件配置影响：启用奇偶校验功能时，访问延迟为 4 个时钟周期，带宽也会相应下降；关闭奇偶校验后，访问延迟可低至 1 个时钟周期。该内存通常用于存放对访问时序敏感的关键代码和数据，适用于对性能和响应时间要求严格的实时系统或嵌入式应用。 具备 DMA 功能