+According to the FW source, looks like USB block is [FUSB200](http://www.faraday-tech.com/techDocument/FUSB200_ProductBrief_v1_2.pdf).
+
# 0x00 ZM_MAIN_CTRL_OFFSET
* BIT7
* BIT6 - 1 = HighSpeed is set (read only?)
* BIT1 - TEST_J
* BIT0
- According to FUSB200 doc:
- DM(D-) DP(D+) Description
- 0 0 0: SE0
- 0 1 1: 'J' State
- 1 0 2: 'K' State
- 1 1 3: SE1
+According to FUSB200 doc:
+DM(D-) DP(D+) Description
+0 0 0: SE0
+0 1 1: 'J' State
+1 0 2: 'K' State
+1 1 3: SE1
+ 0: Control PHY to turn off 1.5K Ohm pull-up resistor
+ 1: Control PHY to turn on 1.5K Ohm pull-up resistor