Datasheet – SMSC LAN9311i User Manual

Page 65

Two Port 10/100 Managed Ethernet Switch with 16-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9311/LAN9311i

Revision 1.4 (08-19-08)

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)

Entry)

3. Poll the Make Pending bit in the

Switch Engine ALR Command Status Register

(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 368

through

Section 14.5.3.6, on page 375

for detailed

definitions of these registers.

This manual is related to the following products:

LAN9311