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TUSB2046B: 串联电阻和晶体的选择问题

Part Number: TUSB2046B

1:根据这份文件Application Report SLLA314,USB信号线TI建议串联阻抗匹配电阻,请问TUSB2046BI这颗HUB的内阻多大?需要串联多大阻值的电阻?谢谢!

2:请问晶体的频率是否只能选择6MHz这个频率?我们的空间有限,6MHz的晶体体积过大。其他比如8MHz、12MHz是否可以?