EVB8187 Standard Microsystems (SMSC), EVB8187 Datasheet - Page 5

• Manufacturer Part Number: EVB8187
• Manufacturer: Standard Microsystems (SMSC)

Specifications of EVB8187

• Lead Free Status / Rohs Status: Supplier Unconfirmed

EVB8187 User Manual
Note:
SMSC EVB8187
2.2.2
2.2.3
2.2.4
Populated
Populated
Populated
Populated
MODE2
Empty
Empty
Empty
Empty
†.Please refer to the Datasheet Section 5.4 for more information on Powerdown mode.
‡.Please refer to the Datasheet Section 5.4 for more information on Repeater mode.
R48
An Empty resistor means an internal pull-up will bootstrap the Mode pin high to a logic 1. A Populated
resistor will bootstrap the Mode pin low to a logic 0.
Boot Mode Configuratino Options
There are Three resistors used to bootstrap the PHY into a specific mode.
to populate the resistor to configure the PHY into different modes upon bootup/after reset..
Pin 46 mode configuration
Pin 46 can either be configured to drive nINT (Active low output interrupt pin) or to drive TXER/TXD4
(Transmit Error pin or Transmit Data 4). This bootstrapping option is controlled by R51 on the board,
which is a 10k pull-down to ground on RXD3/nINTSEL. Normally this resistor is empty and the pin is
pulled high internally. This default is to configure pin 46 option as nINT. To change this to a TXER pin,
the user needs to populate R51. Refer to the LAN8187 datasheet for instructions on changing the
TXER pin to a TXD4 pin.
Digital Communications Mode
Resistor R56 will change the digital communications mode of the LAN8187 PHY. By default this resistor
is empty. An empty resistor defaults the pin to low at bootup and configures the PHY for MII
communication.
If R56 is populated with a 10k resistor, then the device will bootup in RMII mode. However, this EVB
is not designed to handle RMII mode, the resistor is left as a reference for the end customer.
Populated
Populated
Populated
Populated
MODE1
Empty
Empty
Empty
Empty
R49
Populated
Populated
Populated
Populated
MODE0
Empty
Empty
Empty
Empty
R50
Table 3 PHY Address Configuration Resistors
All Capable AutoNegotiate Enable [Default]
Powerdown mode
Repeater Mode
100Base-TX Half Duplex is advertised.
Auto-negotiate enabled.
CRS is active during Receive.
100Base-TX Half Duplex is Advertised.
Auto-negotiation is enabled.
CRS is active during Transmit and Receive.
100Base-TX Full Duplex.
Auto-negotiate disabled.
CRS is active during receive.
100Base-TX Half Duplex.
Auto-negotiaion disabled.
CRS is active during transmit and receive.
10Base-T Full Duplex. Auto-negotiation
disabled.
10Base-T Half Duplex. Auto-negotiation
disabled.
www.smsc.com
BOOT MODE DESCRIPTION
5
‡
:
†
startup..
Table 3
MODE REGISTER BITS
Revision 0.7 (12-8-06)
below shows how
MODE [2:0]
110
101
100
011
010
001
000
111