VSC8504-02 datasheet(41/131 Pages) MICROSEMI

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Functional Descriptions

VMDS-10507 VSC8504-02 Datasheet Revision 4.2

multipurpose GPIO[7:4]_I2C_SCL_[3:0] and GPIO8/I2C_SDA device pins, which must be configured to

the corresponding two-wire serial function. For more information about configuring the pins, see

Two-Wire Serial MUX Control 1, page 81. For SFP modules, VSC8504-02 can also provide control for

the MODULE_DETECT and TX_DIS module pins using the multipurpose LED and GPIO pins.

Figure 30 •

Two-Wire Serial MUX with SFP Control and Status

3.15.1

Read/Write Access Using the Two-Wire Serial MUX

Using the integrated two-wire serial MUX, the VSC8504-02 device can read and write to an SFP or PoE

module through the SCL and SDA pins. If the ability is required to write to the slave two-wire serial

device, refer to the device's specific datasheet for more information.

Note: The VSC8504-02 device does not automatically increment the two-wire serial address. Each desired

address must be intentionally set.

Main control of the integrated two-wire serial MUX is available through register 20G. The two-wire serial

MUX pins are enabled or disabled using register 20G bits 3:0. Register 20G bits 15:9 set the two-wire

serial device address (the default is 0xA0). Using register 20G bits 5:4, the two-wire serial frequency can

be changed from 100 kHz to other speeds, such as 50 kHz, 100 kHz (the default), 400 kHz, and 2 MHz.

Note: The frequencies listed are available when the PHY API is used.

Registers 21G and 22G provide status and control of the read/write process. The following illustration

shows the read and write register flow.

Management

Interface

MDC

MDIO

PHY

Integrated I2C

Mux

GPIO4/I2C_SCL_0

GPIO5/I2C_SCL_1

GPIO6/I2C_SCL_2

GPIO7/I2C_SCL_3

GPIO8/I2C_SDA

SFP0

SDA

SCL

SFP1

SDA

SCL

SFP2

SDA

SCL

SFP3

SDA

SCL

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