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USB Sniffer

This core is a USB analyzer (USB bus sniffer). It converts from a ULPI interface (standard on various USB 2.0 PHYs such as the USB3300) to a bus-mastering Wishbone memory interface.

Configuration of the IP is performed using a Wishbone slave interface.

Features

  • Filtering based on match or not match of device ID and/or endpoint
  • Filtering of SOF packets
  • 0.5uS timing resolution (HS) or 4uS timing resolution (FS/LS)
  • Support LS (1.5mbps), FS (12mbps) and HS (480mbps) captures.
  • Dense logging format.
  • Supports continuous streaming, one shot and detects buffer overruns.
Register Map
Offset Name Description
0x00 USB_BUFFER_CFG [RW] Configuration Register
0x04 USB_BUFFER_BASE [RW] Buffer Base Address
0x08 USB_BUFFER_END [RW] Buffer End Address
0x0c USB_BUFFER_STS [R] Status Register
0x10 USB_BUFFER_CURRENT [R] Buffer Current address
0x14 USB_BUFFER_READ [RW] Buffer Read Address
Register: USB_BUFFER_CFG
Bits Name Description
30:24 DEV Device ID to match (only if MATCH_DEV = 1)
19:16 EP Endpoint to match (only if MATCH_EP = 1)
8:7 SPEED USB bus speed (0 = HS, 1 = FS, 2 = LS)
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 CONT Continuous capture - overwrite on wrap (0 = Stop on full, 1 = cont)
0 ENABLED Capture enabled
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_STS
Bits Name Description
3 OVERFLOW Occurs when write pointer (BUFFER_CURRENT) hits read pointer (BUFFER_READ)
2 MEM_STALL Overrun due to memory stall (data lost)
1 WRAPPED Capture wrapped
0 TRIG Capture triggered
Register: USB_BUFFER_CURRENT
Bits Name Description
31:0 ADDR Current buffer address - always a log entry word
Register: USB_BUFFER_READ
Bits Name Description
31:0 ADDR Used by block to detect overflow
References
Testing

Tested on Spartan 6 LX9 (miniSpartan6+) with internal blockRAM and external USB PHY (USB3300). Various types of USB device traces captured.