AM2432: PRU-EMIF throughput

Tony Tang

Mastermind 30552 points

Part Number: AM2432

Regarding the pru_emif example.

https://github.com/TexasInstruments/open-pru/blob/main/examples/pru_emif/readme.md

What is the 'n' in the test result table?

Is there throughput data?

EMIF Read/Write Tests

Test ID	Name	Description	Test Results	Notes
0	n Read 16-bit, SOB	F283879D read n 16-bit words from AM243x DPM. Read toward start of DPM buffer.	PASS	n=8
1	n Read 16-bit, EOB	F283879D read n 16-bit words from AM243x DPM. Read toward end of DPM buffer.	PASS	n=8

Does it mean read 16-bit data take 8 cycles?

2 months ago

0 Arnav Raj 2 months ago

TI__Prodigy 550 points

Hi Tony Tang,

n here means number of tests with particular test ID. I will get back to you with throughput data.

Regards
Arnav

0 Arnav Raj 2 months ago in reply to Arnav Raj

TI__Prodigy 550 points

Hi Tony Tang,

16 bit asynchronous write operation takes roughly 104 ns ( ~ 20 EMIF Cycles ) whereas 16 bit asynchronous read operation takes 158 ns ( ~32 EMIF Cycles) . EMIF Master ( F2738 Device in this case) Clock runs at 200 MHz.

Regards
Arnav

0 Tony Tang 5 days ago in reply to Arnav Raj

TI__Mastermind 30552 points

Arnav,

I realize the speed is fairly low when I plan to promote to customer:

16 bit asynchronous write: 200/20=10M, 20MByte/s with 16bit

16 bit asynchronous read operation: 200/32=6.25M, 12.5MByte/s with16bit

the throughput is at same level as GPMC.

Processors

Processors forum

AM2432: PRU-EMIF throughput

EMIF Read/Write Tests