core_usb_sniffer
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ultraembedded
USB capture IP
trafficstars
USB Sniffer
Github: https://github.com/ultraembedded/core_usb_sniffer
This core is a HS/FS USB2.0 analyzer (USB bus sniffer).
The core monitors a UTMI interface and logs the traffic seen to a memory buffer via an AXI-4 bus master interface.
The log format can be extracted continuously (continuous capture mode) or the core can stop capturing when the memory buffer is full (one-shot mode).
Configuration of the IP is performed using an AXI4-Lite slave interface.
This core has been used to produce a USB 2.0 Capture Device.
Features
- Option of filtering based on device ID and/or endpoint.
- Option of filtering out SOF packets.
- Option of filtering out IN+NAK packets.
- Dense logging format.
- Supports continuous streaming or one-shot mode.
- Detection of buffer overruns.
Register Map
| Offset | Name | Description |
|---|---|---|
| 0x00 | USB_BUFFER_CFG | [RW] Configuration Register |
| 0x04 | USB_BUFFER_STS | [R] Status Register |
| 0x08 | USB_BUFFER_BASE | [RW] Buffer Base Address |
| 0x0c | USB_BUFFER_END | [RW] Buffer End Address |
| 0x10 | USB_BUFFER_CURRENT | [R] Buffer Current address |
Register: USB_BUFFER_CFG
| Bits | Name | Description |
|---|---|---|
| 31 | CONT | Continuous capture - overwrite on wrap (0 = Stop on full, 1 = cont) |
| 30:24 | DEV | Device ID to match (only if MATCH_DEV = 1) |
| 19:16 | EP | Endpoint to match (only if MATCH_EP = 1) |
| 15 | PHY_DMPULLDOWN | UTMI PHY D+ Pulldown Enable (valid if SPEED=manual) |
| 14 | PHY_DPPULLDOWN | UTMI PHY D+ Pulldown Enable (valid if SPEED=manual) |
| 13 | PHY_TERMSELECT | UTMI PHY Termination Select (valid if SPEED=manual) |
| 12:11 | PHY_XCVRSELECT | UTMI PHY Transceiver Select (valid if SPEED=manual) |
| 10:9 | PHY_OPMODE | UTMI PHY Output Mode (valid if SPEED=manual) |
| 8:7 | SPEED | USB bus speed (0 = HS, 1 = FS, 2 = LS, 3=manual) |
| 6 | EXCLUDE_EP | Exclude specific endpoint |
| 5 | MATCH_EP | Match specific endpoint |
| 4 | EXCLUDE_DEV | Exclude specific device ID |
| 3 | MATCH_DEV | Match specific device ID |
| 2 | IGNORE_SOF | Drop SOF packets (0 = Log SOF, 1 = Drop SOF) |
| 1 | IGNORE_IN_NAK | Drop IN + NAK sequences |
| 0 | ENABLED | Capture enabled |
Register: USB_BUFFER_STS
| Bits | Name | Description |
|---|---|---|
| 2 | DATA_LOSS | Data lost due to stream backpressure |
| 1 | WRAPPED | Capture wrapped |
| 0 | TRIG | Capture triggered |
Register: USB_BUFFER_BASE
| Bits | Name | Description |
|---|---|---|
| 31:0 | ADDR | Address of buffer base |
Register: USB_BUFFER_END
| Bits | Name | Description |
|---|---|---|
| 31:0 | ADDR | Address of buffer end |
Register: USB_BUFFER_CURRENT
| Bits | Name | Description |
|---|---|---|
| 31:0 | ADDR | Current buffer address - last entry written |
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