zynqmpsoc 开发手册 On-chip Memory 章节

Introduction
The on-chip memory (OCM) contains 256 KB of RAM. It supports a 128-bit AXI slave
interface port. The OCM has eight exclusive access monitors that can simultaneously
monitor up to eight exclusive access transactions.
The OCM supports AXI read and write throughput for RAM access by implementing a
double-width memory (256 bits) to maximize the read and write bandwidth. Maximum
bandwidth is achieved when the read/write accesses are a multiple of 256 bits with 256-bit
aligned addresses. The OCM memory unit implements a read-modify-write operation to
accommodate writes that are not 256 bits or unaligned to an 8 byte boundary.
Arbitration between the read and write channels of the OCM switch ports is performed
within the OCM.
Accesses to the OCM must pass through the OCM protection unit, OCM_XMPU. The entire
256 KB of RAM is divided into 64 blocks (4 KB each) and assigned security attributes
independently

Features
• OCM RAM size is 256 KB.
• Clock frequency up to 600 MHz.
• Ensures low memory access latency for the RPU MCore AXI accesses.
• Exclusive access support, implements eight exclusive access monitors.
• AXI port exclusive access.
• Round-robin arbitration.
• 64-bit ECC with error injection scheme to check ECC errors.
• Four island power down and data retention support.
• Memory protection and TrustZone support.

单词表

单词	音标	释义
exclusive	/ɪkˈskluːsɪv/	_adj. _独有的，专用的；高档的，昂贵的；不含……的；排外的；排斥的；全部的；唯一关心的；（新闻或报道）独家的；（条款）除外责任的；高级的，昂贵的n. 独家新闻，独家报道
simultaneously	ˌsaɪm(ə)lˈteɪniəsli	adv. 同时地
transactions	trænˈzækʃənz	n. 处理，[图情]会报；汇报（transaction 复数）
multiple	ˈmʌltɪp(ə)l	adj.多个的，多种的；多人共有的；影响身体许多部位的n.倍数；<英>连锁商店；（电信）复联，复接
arbitration	ɑːrbɪˈtreɪʃn	n. 仲裁，公断
assigned	əˈsaɪnd	adj. 指定的；已分配的v. 分配（assign 的过去分词）；指定；委派
retention	rɪˈtenʃ(ə)n	_n. _保持，保留；保存，存放；保持力，持续力；记忆力；（热量的）阻滞，