KS8893ML datasheet(45/106 Pages) MICREL

45 / 106 page

Micrel

KS8893M/ML/MI

June 2005

M9999-063005

The following is a sample procedure for programming the KS8893M using the SPI bus:

1. At the board level, connect the KS8893M pins as follows:

KS8893M Pin #

KS8893M Signal Name

External Processor Signal Description

SPIS_N

SPI Slave Select

SCL

(SPIC)

SPI Clock

SDA

(SPID)

SPI Data

(Master output; Slave input)

SPIQ

SPI Data

(Master input; Slave output)

Table 15. KS8893M SPI Connections

2. Enable SPI slave mode by setting the KS8893M strap-in pins PS[1:0] (pins 100 and 101, respectively) to “10”.

3. Power up the board and assert reset to the KS8893M.

After reset, the “Start Switch” bit (register 1 bit [0]) is set to ‘0’.

4. Configure the desired register settings in the KS8893M, using the SPI write or multiple write command.

5. Read back and verify the register settings in the KS8893M, using the SPI read or multiple read command.

6. Write a ‘1’ to the “Start Switch” bit to start the KS8893M with the programmed settings.

Note: The “Start Switch” bit cannot be set to ‘0’ to stop the switch after an ‘1’ is written to this bit. Thus, it is

recommended that all switch configuration settings are programmed before the “Start Switch” bit is set to ‘1’.

Some of the configuration settings, such as “Aging enable”, “Auto Negotiation Enable”, “Force Speed” and “Power

down” can be programmed after the switch has been started.

The following four figures illustrate the SPI data cycles for “Write”, “Read”, “Multiple Write” and “Multiple Read”.

The read data is registered out of SPIQ on the falling edge of SPIC, and the data input on SPID is registered on

the rising edge of SPIC.

SPIQ

SPIC

SPID

SPIS_N

000

00010

A7 A6 A5 A4 A3 A2 A1 A0

WRITE COMMAND

WRITE ADDRESS

WRITE DATA

Figure 8. SPI Write Data Cycle

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