TUSB1310

SLLSE16B – DECEMBER 2009 – REVISED JUNE 2010

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Table 3-8. Disparity Errors

RX_STATUS2-0

DETECTED ERROR

LENGTH

Clock cycles during the ef-fected byte is

111b

Disparity error

transferred on RX_DATA15-0

3.5

Loopback

The TUSB1310 begins an internal loopback operation from SSRXP/SSRXN differential pairs to

SSTXP/SSTXN differential pairs when the TX_DETRX_LPBK is asserted while holding TX_ELECIDLE

de-asserted. The TUSB1310 will stop transmitting data to the SSTXP/SSTXN signaling pair from the

TX_DATA and begin transmitting on the SSTXP/SSTXN signaling pair the data received at the

SSRXP/SSRXN signaling pair. This data is not routed through the 8b/10b coding/encoding paths. While in

the loopback operation, the received data is still sent to the RX_DATA. The data sent to the RX_DATA is

routed through the 10b/8b decoder.

The TX_DETRX_LPBK de-assertion will terminate the loopback operation and return to transmitting

TX_DATA over the SSTXP/SSTXN signaling pair. The TUSB1310 only transitions out of loopback on

detection of LFPS signaling by transitioning to P2 state and starting the LFPS handshake.

22

FUNCTIONAL DESCRIPTION

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