这个IP核是一个 HS/FS USB2.0 分析器（USB 总线嗅探器）。
该内核监控 UTMI 接口并通过 AXI-4 总线主接口将看到的流量记录到内存缓冲区。
可以连续提取日志格式（连续捕获模式），或者当内存缓冲区已满时内核可以停止捕获（单次模式）。
使用 AXI4-Lite 从接口执行 IP 配置。
该IP核已用于生产USB 2.0 协议分析设备。
特征
- 基于设备 ID 和/或端点的过滤选项。
- 过滤掉 SOF 数据包的选项。
- 过滤掉 IN+NAK 数据包的选项。
- 密集的日志记录格式。
- 支持连续流式传输或一次性模式。
- 检测缓冲区溢出。
寄存器映射 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 |
References
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