LAN9312 datasheet(65/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

Revision 1.2 (04-08-08)

DATASHEET

The following procedure should be followed in order to add, delete, and modify the ALR entries:

1. Write the Switch Engine ALR Write Data 0 Register (SWE_ALR_WR_DAT_0) and Switch Engine

ALR Write Data 1 Register (SWE_ALR_WR_DAT_1) with the desired MAC address and control

bits.

Note:An entry can be deleted by setting the Valid and Static bits to 0.

2. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) register with 0004h (Make

Entry)

3. Poll

the

Make

Pending

bit

the

Switch

Engine

ALR

Command

Status

(SWE_ALR_CMD_STS) until it is cleared.

4. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) with 0000h.

The ALR contains a search engine that is used by the host to read the MAC Address Table. This

engine is accessed by using the Switch Engine ALR Command Register (SWE_ALR_CMD), Switch

Engine ALR Read Data 0 Register (SWE_ALR_RD_DAT_0), and Switch Engine ALR Read Data 1

Note: The entries read are not necessarily in the same order as they were learned or manually

added.

The following procedure should be followed in order to read the ALR entries:

1. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) with 0002h (Get First Entry).

2. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) with 0000h (Clear the Get

First Entry Bit)

3. Poll the Valid and End of Table bits in the Switch Engine ALR Read Data 1 Register

(SWE_ALR_RD_DAT_1) until either are set.

4. If the Valid bit is set, then the entry is valid and the data from the Switch Engine ALR Read Data

0 Register (SWE_ALR_RD_DAT_0) and Switch Engine ALR Read Data 1 Register

(SWE_ALR_RD_DAT_1) can be stored.

5. If the End of Table bit is set, then exit.

6. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) with 0001h (Get Next Entry).

7. Write the Switch Engine ALR Command Register (SWE_ALR_CMD) with 0000h (Clear the Get

Next Entry bit)

8. Go to step 3.

Note: Refer to Section 14.5.3.1, on page 367 through Section 14.5.3.6, on page 374 for detailed

definitions of these registers.

LAN9312 Datenblatt(PDF) 65 Page - SMSC Corporation

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