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TUSB1310A Datasheet(PDF) 20 Page - Texas Instruments |
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TUSB1310A Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 42 page  TUSB1310A SLLSE32D – NOVEMBER 2010 – REVISED MAY 2011 www.ti.com 3.3.1 USB Power Management The USB 3.0 specification improves power consumption by defining 4 power states, U0, U1, U2, and U3 while the PIPE specification defines P0, P1, P2 and P3. The POWER_DOWN pin states are mapped to LTSSM states as described in Table 3-2. For all power state transitions, the Link Layer Controller must not begin any operational sequences or further power state transitions until the TUSB1310A has indicated that the internal state transition is completed. Table 3-2. Power States PIPE POWER USB POWER STATE PCLK PLL TRANSMITTING RECEIVING PHY_STATUS STATE U0, all other LTSSM P0 On On Active or Idle or LFPS Active or Idle A single cycle assertion states P1 U1 On On Idle or LFPS Idle A single cycle assertion U2, RxDetect, Idle or LFPS or P2 On On Idle A single cycle assertion SS.Inactive RxDetect PHY_STATUS is Off. The PIPE is in asserted before PCLK is P3 U3, SS.disabled an asynchronous Off LFPS or RxDetect Idle turned off and mode de-asserted when PCLK is fully off. When the Link Layer Controller wants to transmit LFPS in P1, P2, or P3 state, it must de-assert TX_ELECIDLE. The TUSB1310A generates valid LFPS until the TX_ELECIDLE is asserted. The Link Layer Controller must assert TX_ELECIDLE before transitioning to P0. When RX_ELECIDLE is de-asserted in P0, P1, P2, or P3, the TUSB1310A receiver monitors for LFPS except during reset or when RX_TERMINATION is removed for electrical idle. When the TUSB1310A is in P0 and is actively transmitting; only RX_POLARITY can be asserted. Table 3-3. PIPE Control Pin Matrix POWER STATE TX_DETRX_LPBK TX_ELECIDLE DESCRIPTION 0 0 Transmitting data on TX_DATA. 0 1 Not transmitting and is in electrical idle P0 1 0 Goes into loopback mode 1 1 Transmits LFPS signaling 0 Transmits LFPS signaling P1 Don ’t care 1 Not transmitting and is in electrical idle Don ’t care 0 Transmits LFPS signaling P2 0 1 Idle 1 1 Does a receiver detection operation 0 Transmits LFPS signaling P3 Don ’t care 1 Does a receiver detection operation 20 FUNCTIONAL DESCRIPTION Copyright © 2010–2011, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TUSB1310A |
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