Tusb212 眼图左边压警告线右边PASS.

Jin

Prodigy 40 points

Other Parts Discussed in Thread: TUSB212

1，Tusb212 redriver 测试眼图时，EQ调整到0R电阻对地.JK7mv 眼图左边压警告线右边pass. 如何调整. 如果能调整斜率也好 .

2， DC_BST/ENA_HS(9Pin)这个是调整什么的？如何调整.目前这个眼图情况下是悬空DC_BST/ENA_HS(9Pin)这个脚的测试结果.

3，对于灵敏度调整.改调整哪些参数.

请教各位了

6 年多前

0 Kailyn Chen 6 年多前

TI__Guru**** 295050 points

您好，眼图左边压线，能否附上眼图看下？是否指的斜率不够？
2. DC_BST/ENA_HS(9Pin)这个引脚的定义很详细，如果I2C mode的话，这个引脚不用管，是预留用来测试的。
如果不是在I2C mode下的话，reset时候，是个三态输入信号。 reset之后，是个输出信号，用来检测是否USB高速模式。所以此引脚悬空应该是不会影响眼图效果的。

In I2C mode:
Reserved for TI test purpose.
In non-I2C mode:
At reset: 3-level input signal DC_BOOST. USB High Speed DC signal boost selection.
H (pin is pulled high) – 80 mV
M (pin is left floating) – 60 mV
L (pin is pulled low) – 40 mV
After reset: Output signal ENA_HS. Flag indicating that channel is in High Speed mode.
Asserted upon:
1. Detection of USB-IF High Speed test fixture from an unconnected state followed by
transmission of USB TEST_PACKET pattern.
2. Squelch detection following USB reset with a successful HS handshake [HS
handshake is declared to be successful after single chirp J chirp K pair where each chirp
is within 18 μs – 128 μs].