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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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