LAN9312 datasheet(30/458 Pages) SMSC

30 / 458 page

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

Datasheet

Revision 1.2 (04-08-08)

SMSC LAN9312

DATASHEET

122,125

+3.3V Port 2

Analog Power

Supply

VDD33A2

+3.3V Port 2 Analog Power Supply

Refer to the LAN9312 application note for

additional connection information.

120

+3.3V Master

Bias Power

Supply

VDD33BIAS

+3.3V Master Bias Power Supply

Refer to the LAN9312 application note for

additional connection information.

121

Port 2

Transmitter

+1.8V Power

Supply

VDD18TX2

Port 2 Transmitter +1.8V Power Supply: This pin

is supplied from the internal PHY voltage regulator.

This pin must be tied to the VDD18TX1 pin for

proper operation.

Refer to the LAN9312 application note for

additional connection information.

118

Port 1

Transmitter

+1.8V Power

Supply

VDD18TX1

+1.8V Port 1 Transmitter Power Supply: This pin

must be connected directly to the VDD18TX2 pin

for proper operation.

Refer to the LAN9312 application note for

additional connection information.

Table 3.4 Host Bus Interface Pins

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

4-6,

8-12,

15-17,19,

20,22-26,

28-32,

34-38,

41-44

Host Bus

Data

D[31:0]

IS/O8

Host Bus Data High: Bits 31-0 of the Host Bus 32-

bit data port.

Note:

Big and little endianess is supported.

45,47,

49-53,

Host Bus

Address

A[9:2]

Host Bus Address: 9-bit Host Bus Address Port

used to select Internal CSR’s and TX and RX

FIFO’s.

Note:

The A0 and A1 bits are not used because

the LAN9312 must be accessed on

DWORD boundaries.

Read Strobe

nRD

Read Strobe: Active low strobe to indicate a read

cycle. This signal is qualified by the nCS chip

select.

Write Strobe

nWR

Write Strobe: Active low strobe to indicate a write

cycle. This signal is qualified by the nCS chip

select.

Chip Select

nCS

Chip Select: Active low signal used to qualify read

and write operations.

Table 3.3 LAN Port 1 & 2 Power and Common Pins (continued)

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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