MVTX2803 查看數據表（PDF） - Zarlink Semiconductor Inc

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MVTX2803

Unmanaged 8-Port 1000 Mbps Ethernet Switch

Zarlink Semiconductor Inc 

MVTX2803

Data Sheet

2.1.6 Stop Condition

Generated by the master, the MVTX2803AG. The bus is considered to be free after the Stop condition is

generated. The Stop condition occurs if while the SCL line is High, there is a Low-to-High transition of the SDA.

The I2C interface serves the function of configuring the MVTX2803AG at boot time. The master is the

MVTX2803AG, and the slave is the EEPROM memory.

2.2 Synchronous Serial Interface

The synchronous serial interface serves the function of configuring the MVTX2803AG not at boot time but via a

PC. The PC serves as master and the MVTX2803AG serves as slave. The protocol for the synchronous serial

interface is nearly identical to the I2C protocol. The main difference is that there is no acknowledgment bit after

each byte of data transferred.

The unmanaged MVTX2803AG uses a synchronous serial interface to program the internal registers. To

reduce the number of signals required, the register address, command and data are shifted in serially through

the PS_DI pin. PS_STROBE pin is used as the shift clock. PS_DO pin is used as data return path.

Each command consists of four parts.

• START pulse

• Register Address

• Read or Write command

• Data to be written or read back

Any command can be aborted in the middle by sending an ABORT pulse to the MVTX2803AG.

A START command is detected when PS_DI is sampled high at PS_STROBE - leading edge, and PS_DI is sampled

low when STROBE- falls.

An ABORT command is detected when PS_DI is sampled low at PS_STROBE - leading edge, and PS_DI is sampled

high when PS_STROBE - falls.

2.2.1 Write Command

PS-STROBE-

PS_DI

A0 A1 A2 ... A9 A10 A11 W D0 D1 D2 D3 D4 D5 D6 D7

START

ADDRESS

COMMAND

DATA

2 extra clocks after

last transfer

2.2.2 Read Command

PS-STROBE-

PS_DI

PS_DO

A0 A1 A2 ... A9 A10 A11 R

START

ADDRESS

COMMAND

DATA

D0 D1 D2 D3 D4 D5 D6 D7

All registers in the MVTX2803AG can be modified through this synchronous serial interface.

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