LAN9313 Datasheet, PDF (108/398 Pages) SMSC Corporation – Three Port 10/100 Managed Ethernet Switch with MII

Three Port 10/100 Managed Ethernet Switch with MII
Datasheet
8.2.3 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 8.3.
Table 8.3 Microwire EEPROM Size Ranges
eeprom_size_strap[1:0]
00
01
10
11
# OF ADDRESS BITS
7
9
11
EEPROM SIZE
128 x 8
256 x 8 and 512 x 8
1024 x 8 and 2048 x 8
RESERVED
EEPROM TYPES
93xx46A
93xx56A, 93xx66A
93xx76A, 93xx86A
8.2.3.1
Refer to Section 14.5.4, "Microwire Timing," on page 392 for detailed Microwire timing information.
Microwire Master Commands
Table 8.4, Table 8.5, and Table 8.6 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 13.1.3.1, "EEPROM Command Register (E2P_CMD)," on
page 160.
Table 8.4 Microwire Command Set for 7 Address Bits
INST
START
BIT OPCODE
ERASE
1
11
ERAL
1
00
EWDS
1
00
EWEN
1
00
READ
1
10
WRITE
1
01
WRAL
1
00
ADDRESS
A6 A5 A4 A3 A2 A1 A0
10XXXXX
00XXXXX
11XXXXX
A6 A5 A4 A3 A2 A1 A0
A6 A5 A4 A3 A2 A1 A0
01XXXXX
DATA TO DATA FROM # OF
EEPROM EEPROM CLOCKS
-
(RDY/~BSY)
10
-
(RDY/~BSY)
10
-
Hi-Z
10
-
Hi-Z
10
-
D7 - D0
18
D7 - D0 (RDY/~BSY)
18
D7 - D0 (RDY/~BSY)
18
Table 8.5 Microwire Command Set for 9 Address Bits
INST
START
BIT OPCODE
ERASE
1
11
ERAL
1
00
EWDS
1
00
ADDRESS
A8 A7 A6 A5 A4 A3 A2 A1 A0
10XXXXXXX
00XXXXXXX
DATA TO DATA FROM # OF
EEPROM EEPROM CLOCKS
-
(RDY/~BSY)
12
-
(RDY/~BSY)
12
-
Hi-Z
12
Revision 1.2 (04-08-08)
108
DATASHEET
SMSC LAN9313/LAN9313i