VSC7440 datasheet(375/444 Pages) MICROSEMI

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VCore-III System and CPU Interfaces

VMDS-10492 VSC7440 Datasheet Revision 4.2

358

The output mode can additionally be modified with PWM (SIO_PORT_CFG.PWM_SOURCE) and

configurable polarity (SIO_PORT_CFG.BIT_POLARITY).

Static Mode The static mode is used to assign a fixed value to the SGPIO, for example, fixed 0 or

fixed 1.

Blink Mode The blink mode makes the SGPIO blink at a fixed rate. The SIO controller features two

blink modes that can be set independently. A SGPIO can then be configured to use either blink mode 0

or blink mode 1. The blink outputs are configured in SIO_CFG.SIO_BMODE_0 and

SIO_CFG.SIO_BMODE_1. To synchronize the blink modes between different devices, reset the blink

counter using SIO_CFG.SIO_BLINK_RESET. All the SIO controllers on a device must be reset at same

time to maintain the synchronization. The burst toggle mode of blink mode 1 toggles the output with

every burst.

Link Activity Mode The link activity mode makes the output blink when there is activity on the port

module (Rx or Tx). The following table lists the mapping between the SIO port number and port modules.

Table 264 •

Blink Modes

Description

Blink Mode 0

0: 20 Hz blink frequency

1: 10 Hz blink frequency

2: 5 Hz blink frequency

3: 2.5 Hz blink frequency

Blink Mode 1

0: 20 Hz blink frequency

1: 10 Hz blink frequency

2: 5 Hz blink frequency

3: Burst toggle

Table 265 •

SIO Controller Port Mapping

SIO Port

SG0 Mapping

Port module 0

Port module 1

Port module 2

Port module 3

Port module 4

Port module 5

Port module 6

Port module 7

Port module 8

Port module 9

Port module 10

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