EVB-LAN9252-HBI+ EtherCAT® Evaluation Board User’s Guide
DS50002333C-page 16
2015-2016 Microchip Technology Inc.
FIGURE 2-2:
EVB-LAN9252-HBI+ TOP VIEW NEW FEATURE CALLOUTS
2.4.1
Strap Options
2.4.1.1
CHIP MODE SELECTION
Table 2-2 details the LAN9252 chip mode configuration straps.
2.4.1.2
EEPROM SIZE CONFIGURATION
The EEPROM size configuration strap (J5 & J8) determines the supported EEPROM
size range. A low selects 1Kbits (128 x 8) through 16Kbits (2K x 8)_24C16. A high
selects 32Kbits (4K x 8) through 512Kbits (64K x 8) or 4Mbits (512K x 8)_24C512.
2.4.1.3
COPPER AND FIBER STRAPS
The LAN9252 supports 100BASE-TX (Copper) and 100BASE-FX (Fiber) modes. In
100BASE-FX operation, the presence of the receive signal is indicated by the external
transceiver as either an open-drain, CMOS level, Loss of Signal (SFP) or a LVPECL
Signal Detect (SFF).
TABLE 2-2:
CHIP MODE CONFIGURATION STRAP
Header
Description
Pins
Settings
J4,J6,J7,J9 Chip mode configuration strap
inputs. This strap determines
the number of active ports and
port types.
1-2
2-3
Short 1-2 for high (pull-up)
(Not supported in this EVB)
Short 2-3 for low (pull-down) (default)
Note:
This EVB supports Chip mode 00 which is 2-port mode, where Port 0 = PHY
A and Port 1 = PHY B. This requires J4, J6, J7, and J9 to be pulled-down
(2-3) shorted. All other configurations are not supported with this EVB.
TABLE 2-3:
EEPROM SIZE CONFIGURATION STRAP
Header
Description
Pins
Settings
J5, J8
EEPROM size configuration
strap inputs. This strap deter-
mines the supported
EEPROM size range.
1-2
2-3
Short 1-2 for high (pull-up) (default)
Short 2-3 for low (pull-down)
