KSZ8041NLAM MICREL [Micrel Semiconductor], KSZ8041NLAM Datasheet - Page 12

• Manufacturer Part Number: KSZ8041NLAM
• Description: 10Base-T/100Base-TX Physical Layer Transceiver
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
Strapping Options
Note:
1.
Pin strap-ins are latched during power-up or reset. In some systems, the MAC receive input pins may drive high during
power-up or reset, and consequently cause the PHY strap-in pins on the MII/RMII signals to be latched high. In this case,
it is recommended to add 1K pull-downs on these PHY strap-in pins to ensure the PHY does not strap-in to ISOLATE or
PCS Loopback mode, or is not configured with an incorrect PHY Address.
July 2008
15
14
13
18
29
28
20
31
16
30
Pin Number
Ipu/O = Input with internal pull-up (40K +/-30%) during power-up/reset; output pin otherwise.
Ipd/O = Input with internal pull-down (40K +/-30%) during power-up/reset; output pin otherwise.
SPEED
PHYAD2
PHYAD1
PHYAD0
CONFIG2
CONFIG1
CONFIG0
ISO
DUPLEX
NWAYEN
Pin Name
Ipd/O
Ipd/O
Ipu/O
Ipd/O
Ipd/O
Ipd/O
Ipd/O
Ipu/O
Ipu/O
Ipu/O
Type
(1)
Pin Function
The PHY Address is latched at power-up / reset and is configurable to any value from
1 to 7.
The default PHY Address is 00001.
PHY Address bits [4:3] are always set to ‘00’.
The CONFIG[2:0] strap-in pins are latched at power-up / reset and are defined as
follows:
ISOLATE mode
During power-up / reset, this pin value is latched into register 0h bit 10.
SPEED mode
During power-up / reset, this pin value is latched into register 0h bit 13 as the Speed
Select, and also is latched into register 4h (Auto-Negotiation Advertisement) as the
Speed capability support.
DUPLEX mode
During power-up / reset, this pin value is latched into register 0h bit 8 as the Duplex
Mode.
Nway Auto-Negotiation Enable
During power-up / reset, this pin value is latched into register 0h bit 12.
CONFIG[2:0]
000
001
010
011
100
101
110
111
Pull-up = Enable
Pull-down (default) = Disable
Pull-up (default) = 100Mbps
Pull-down = 10Mbps
Pull-up (default) = Half Duplex
Pull-down = Full Duplex
Pull-up (default) = Enable Auto-Negotiation
Pull-down = Disable Auto-Negotiation
Mode
MII (default)
RMII
Reserved – not used
Reserved – not used
PCS Loopback
Reserved – not used
Reserved – not used
Reserved – not used
12
M9999-071808-1.2
KSZ8041NL