Memory Usage Monitor#
- Authors:
Aarón Cuevas López
- Version:
1
- IO:
Frame Source, Register Access
- ONIX ID:
28
- ONIX Hubs:
Description#
The Memory Usage Monitor produces periodic samples that contain information about data buffer memory status. This device is useful for monitoring if frames are being cleared fast enough by the host PC to prevent real-time delays or overflows. Ideally, buffering should never be used and the memory usage should remain at 0.
Register Programming#
Address |
Name |
Access |
Time of Effect |
POR Value |
Reset Action |
Description |
|---|---|---|---|---|---|---|
0x00 |
ENABLE |
R/W |
On Reset |
Implementation dependent, see hub documentation |
None |
The LSB is used to enable or disable the device data stream:
|
0x01 |
CLK_DIV |
R/W |
On Reset |
CLK_HZ / HB_HZ where HB_HZ is a implementation dependent default rate |
None |
Read frequency clock divider ratio. Minimum value is CLK_HZ / 10e6 |
0x02 |
CLK_HZ |
R |
N/A |
N/A |
None |
The frequency parameter, CLK_HZ, used in the calculation of CLK_DIV. |
0x03 |
MEM_WORDS |
R |
N/A |
N/A |
None |
The total number of 32-bit words in memory. |
0x04 |
MEM_USAGE |
R |
Continuous |
0 |
None |
Number of 32-bit words stored in memory, same value as what the frames generate |
Device To Host Data Frames#
Each frame transmitted to the host is structured as follows:
Host To Device Data Frames#
This device does not accept input frames. All write attempts will fail with an error.