LAN9312 datasheet(144/458 Pages) SMSC

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

Datasheet

Revision 1.2 (04-08-08)

144

SMSC LAN9312

DATASHEET

10.2.3

Microwire EEPROM

Based on the configuration strap eeprom_type_strap, various sized Microwire EEPROMs are

supported. The varying size ranges are supported by additional bits in the address field

(EPC_ADDRESS) of the EEPROM Command Register (E2P_CMD). Within each size range, the

largest EEPROM uses all the address bits, while the smaller EEPROMs treat the upper address bits

as don’t cares. The EEPROM controller drives all the address bits as requested regardless of the

actual size of the EEPROM. The supported size ranges for Microwire operation are shown in

Table 10.3.

Refer to Section 15.5.10, "Microwire Timing," on page 453 for detailed Microwire timing information.

10.2.3.1

Microwire Master Commands

Table 10.4, Table 10.5, and Table 10.6 detail the Microwire command set, including the number of clock

cycles required, for 7, 9, and 11 address bits respectively. These commands are detailed in the

following sections as well as in Section 14.2.4.1, "EEPROM Command Register (E2P_CMD)," on

page 197.

Table 10.3 Microwire EEPROM Size Ranges

eeprom_size_strap[1:0]

# OF ADDRESS BITS

EEPROM SIZE

EEPROM TYPES

128 x 8

93xx46A

256 x 8 and 512 x 8

93xx56A, 93xx66A

1024 x 8 and 2048 x 8

93xx76A, 93xx86A

RESERVED

Table 10.4 Microwire Command Set for 7 Address Bits

INST

START

BIT

OPCODE

ADDRESS

DATA TO

EEPROM

DATA FROM

EEPROM

# OF

CLOCKS

ERASE

A6 A5 A4 A3 A2 A1 A0

(RDY/~BSY)

ERAL

1 0 X X X X X

(RDY/~BSY)

EWDS

0 0 X X X X X

Hi-Z

EWEN

1 1 X X X X X

Hi-Z

READ

A6 A5 A4 A3 A2 A1 A0

D7 - D0

WRITE

A6 A5 A4 A3 A2 A1 A0

D7 - D0

(RDY/~BSY)

WRAL

0 1 X X X X X

D7 - D0

(RDY/~BSY)

Table 10.5 Microwire Command Set for 9 Address Bits

INST

START

BIT

OPCODE

ADDRESS

DATA TO

EEPROM

DATA FROM

EEPROM

# OF

CLOCKS

ERASE

A8 A7 A6 A5 A4 A3 A2 A1 A0

(RDY/~BSY)

ERAL

1 0 X X X X X X X

(RDY/~BSY)

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