STULPI01ATBR datasheet(23/44 Pages) STMICROELECTRONICS

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STULPI01A - STULPI01B

Block description

23/44

Low power mode is exited by asserting STP pin high. PLL is started immediately, and when

the clock becomes stable, it is passed on the output of CLK pin. Then after minimum of 5

clock cycles DIR is deasserted and low power mode is exited. SuspendM bit is reset to 1b.

Note:

STP signal must be kept high until the DIR is deasserted, otherwise low power mode will not

be exited.

6.16

Power down mode

Power down mode is entered by asserting the CSn/PWRDN pin high. Internal voltage

regulators are disabled, and the device has minimum possible power consumption.

STULPI01 has no wake-up capability or USB functionality during power down mode. This

mode can be exited by deasserting CSn/PWRDN pin. Voltage regulators will be turned on

and internal power-on-reset circuit will reset the chip to initial state. ULPI interface pins are

in high impedance state during power down mode.

6.17

VIO OFF mode

In case 1V8VIO voltage is below the minimum value, the VIO OFF mode is entered. The

behavior of the device in VIO OFF mode is the same as in power down mode.

6.18

Start-up procedure

6.18.1

ULPI device detection

Link detects ULPI device presence by sampling the DIR signal at the reset time (Figure 8).

The NXT signal is '0' after reset to signalize 8-bit device to link controller. CLK is '1' to

signalize a DDR capable device.

6.18.2

SDR mode selection

The STULPI01 samples the D0 line on the first rising edge of the output clock on the CLK

pin. When the sampled value is '0', the STULPI01 remains in SDR mode.

SDR mode can be selected again only after hardware reset. During software reset mode,

selection is not performed.

Note:

IMPORTANT: The controller must not drive the DATA lines to a value other than 0x00 or

0x01 during the first rising edge of ULPI CLK, otherwise the behavior of the device may be

undefined.

Table 11.

Low power mode

Signal

Map to

Dir

Description

linestate (0)

out

Driven combinatorially from SE receivers

linestate (1)

out

Driven combinatorially from SE receivers

reserved

out

Reserved

INT

out

Active high interrupt indication. Asserted whenever

any unmasked interrupt occurs.

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