IMX53CEC datasheet(121/204 Pages) FREESCALE

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Electrical Characteristics

i.MX53xD Applications Processors for Consumer Products, Rev. 2

Freescale Semiconductor

121

4.7.13.2.2

SATA PHY Receiver Characteristics

Table 79 provides specifications for SATA PHY receiver characteristics.

4.7.13.3

SATA_REXT Reference Resistor Connection

The impedance calibration process requires connection of reference resistor 191 Ω. 1% precision resistor

on SATA_REXT pad to ground.

Resistor calibration consists of learning which state of the internal Resistor Calibration register causes an

internal, digitally trimmed calibration resistor to best match the impedance applied to the SATA_REXT

pin. The calibration register value is then supplied to all Tx and Rx termination resistors.

During the calibration process (for a few tens of microseconds), up to 0.3 mW can be dissipated in the

external SATA_REXT resistor. At other times, no power is dissipated by the SATA_REXT resistor.

4.7.13.4

SATA Connectivity When Not in Use

NOTE

The Temperature Sensor is part of the SATA module. If SATA IP is disabled,

the Temperature Sensor will not work as well. Temperature Sensor

functionality is important in supporting high performance applications

without overheating the device (at high ambient temp).

When both SATA and thermal sensor are not required, connect VP and VPH supplies to ground. The rest

of the ports, both inputs and outputs (SATA_REFCLKM, SATA_REFCLKP, SATA_REXT, SATA_RXM,

SATA_RXP, SATA_TXM) can be left floating. It is not recommended to turn off the VPH while the VP is

active.

When SATA is not in use but thermal sensor is still required, both VP and VPH supplies must be powered

on according to their nominal voltage levels. The reference clock input frequency must fall within the

specified range of 25 MHz to 156.25 MHz. SATA_REXT does not need to be connected, as the

termination impedance is not of consequence.

Table 79. SATA PHY Receiver Characteristics

Parameters

Symbol

Min

Typ

Max

Unit

Minimum Rx eye height (differential peak-to-peak) VMIN_RX_EYE_HEIGHT

—

175

Tolerance

PPM

–400

—

400

ppm

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