STM32F479AI datasheet(149/208 Pages) STMICROELECTRONICS

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STM32F479xx

Electrical characteristics

187

Ethernet characteristics

Unless otherwise specified, the parameters given in Table 74, Table 75 and Table 76 for

SMI, RMII and MII are derived from tests performed under the ambient temperature, fHCLK

frequency summarized in Table 17 and VDD supply voltage conditions summarized in

Table 73, with the following configuration:

•

Output speed is set to OSPEEDRy[1:0] = 10

•

Capacitive load C = 30 pF

•

Measurement points are done at CMOS levels: 0.5 VDD.

Refer to Section 5.3.20 for more details on the input/output characteristics.

Table 74 gives the list of Ethernet MAC signals for the SMI (station management interface)

and Figure 49 shows the corresponding timing diagram.

Table 72. Dynamic characteristics: USB ULPI(1)

1. Guaranteed based on test during characterization.

Symbol

Parameter

Conditions

Min.

Typ.

Max. Unit

tSC

Control in (ULPI_DIR, ULPI_NXT)

setup time

-2.0

tHC

Control in (ULPI_DIR, ULPI_NXT)

hold time

-1.5

tSD

Data in setup time

1.0

tHD

Data in hold time

1.0

tDC/tDD Data/control output delay

2.7 V < VDD < 3.6 V,

CL = 20 pF

-7.5

9.0

2.7 V < VDD < 3.6 V,

CL = 15 pF and

-40 < T < 125°C

7.5

12.0

1.7 V < VDD < 3.6 V,

CL = 15 pF and

-40 < T < 90°C

-7.5

11.5

Table 73. Ethernet DC electrical characteristics

Symbol

Parameter

Min.(1)

1. All the voltages are measured from the local ground potential.

Max.(1)

Unit

Input level

VDD

Ethernet operating voltage

2.7

3.6

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