This document introduces the performance of the ADSP-BF535 Blackfin® Processor PCI interface, including burst and single word transfers
This Engineer to Engineer Note discusses the performance characteristics of the ADSP-BF535 Blackfin Processor's PCI interface. The analysis focuses on burst transfers and single word transfers to determine maximum throughput and efficiency. Testing was conducted using the Eagle-35 and Hawk-35 boards as a system host and PCI device, respectively, with a VMETRO PCI bus analyzer used to monitor traffic.
| MemDMA engine burst size | 8 words |
|---|---|
| Maximum SCLK frequency | 133 MHz |
| PCI interface theoretical maximum throughput (single-word write) | 44 MB/s |
| BF535 transaction FIFO depth | 4 transactions deep |
| Transaction and transmit data FIFO depth | 8 x 32-bit words deep |
The maximum frequency to which SCLK can be set is 133 MHz.
The MemDMA engine's burst size is 8 words, meaning a new address phase is issued after every 8 words transferred.
No, reads are not posted, and there is at least one extra turnaround cycle added between the address and data phases.