VSC8504-02 datasheet(42/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

Figure 31 •

Two-Wire Serial MUX Read and Write Register Flow

To read a value from a specific address of the two-wire serial slave device:

Read the VSC8504-02 device register 21G bit 15, and ensure that it is set.

Write the PHY port address to be read to register 21G bits 11:10.

Write the two-wire serial address to be read to register 21G bits 7:0.

Set both register 21G bits 8 and 9 to 1.

When register 21G bit 15 changes to 1, read the 8-bit data value found at register 22G bits 15:8.

This is the contents of the address just read by the PHY.

To write a value to a specific address of the two-wire serial slave device:

Read the VSC8504-02 device register 21G bit 15 and ensure that it is set.

Write the PHY port address to be written to register 21G bits 11:10.

Write the address to be written to register 21G bits 7:0.

Set register 21 bit 8 to 0.

Set register 22G bits 7:0 with the 8-bit value to be written to the slave device.

Set register 21G bit 9 to 1.

To avoid collisions during read and write transactions on the two-wire serial bus, always wait until register

21G bit 15 changes to 1 before performing another two-wire serial read or write operation.

3.16

GPIO Pins

The VSC8504-02 provides 18 multiplexed general purpose input/output (GPIO) pins. All device GPIO

pins and their behavior are controlled using registers. The following table shows an overview of the

Table 10 •

GPIO Pin

GPIO_ctrl

GPIO Input

GPIO Output

GPIO Output Enable

GPIO0/SIGDET0

13G.1:0

15G.0

16G.0

17G.0

GPIO1/SIGDET1

13G.3:2

15G.1

16G.1

17G.1

GPIO2/SIGDET2

13G.5:4

15G.2

16G.2

17G.2

GPIO3/SIGDET3

13G.7:6

15G.3

16G.3

17G.3

Start

Wait for

Ready

21G.9 = 1

21G.11:10 = PHY port to Write

21G.7:0 = Address to Write

21G.8 = 1

22G.7:0 = Data to Write

Read or Write

Read Data =

22G.15:8

Wait for

Ready

21G.9 = 1

21G.11:10 = PHY port to Read

21G.7:0 = Address to Read

21G.8 = 1

21G.15 = 0

21G.15 = 1

21G.15 = 0

Read SFP Data

21G.15 = 1

Write

SFP

Data

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