VSC7440 datasheet(422/444 Pages) MICROSEMI

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Pin Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

405

7.2.2

General-Purpose Inputs and Outputs

The following table lists the general-purpose I/O (GPIO) pins. Leave GPIO pins unconnected when not in

use.

Many of the GPIO pins serve multiple functions. For more information about the overlaid functions and

how to configure them, GPIO Overlaid Functions, page 352.

7.2.3

JTAG Interface

The following table lists the pins associated with the JTAG interface. The JTAG interface can be

connected to the boundary scan TAP controller or the internal VCore-III TAP controller for software

debug as described under the JTAG_ICE_nEN signal.

The JTAG signals are not 5 V tolerant.

7.2.4

MII Management Interface

The following table lists the pins associated with the MII Management interface. The MIIM signals are

GPIO alternate functions. For more information about the GPIO pin mapping, see GPIO Overlaid

Functions, page 352.

Table 326 •

GPIO Pins

Name

I/O

Level

Description

GPIO_[36:0]

I/O

CMOS

General-purpose inputs and outputs.

Table 327 •

JTAG Interface Pins

Name

I/O

Type

Level

Description

JTAG_ICE_nEN

ST, 3V

CMOS 0: Enables VCore-III debug interface over the JTAG interface.

1: Enables normal JTAG I/O over the JTAG interface.

JTAG_ICE_nEN should be pulled either high or low using a

resistor of 10 k

Ω or less to enable the desired operating mode.

JTAG_nTRST

ST, 3V

CMOS JTAG test reset, active low. For normal device operation,

JTAG_nTRST should be pulled low.

JTAG_TCK

ST, 3V

CMOS JTAG clock.

JTAG_TDI

ST, 3V

CMOS JTAG test data in.

JTAG_TDO

OZ, 3V

CMOS JTAG test data out.

JTAG_TMS

ST, 3V

CMOS JTAG test mode select.

Table 328 •

MII Management Interface Pins

Name

I/O

Type

Level

Description

MDC1

I/O

CMOS

Management data clock.

MDC1 is sourced by the station management entity (the device) to

the PHY as the timing reference for transfer of information on the

MDIO1 signal. MDC1 is an aperiodic signal.

MDIO1

I/O

CMOS

Management data input/output.

MDIO1 is a bidirectional signal between a PHY and the device, used

to transfer control and status information. Control information is

driven by the device synchronously with respect to MDC1 and is

sampled synchronously by the PHY. Status information is driven by

the PHY synchronously with respect to MDC1 and is sampled

synchronously by the device.

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