
21145
8
Preliminary 
Datasheet
gep<2>
/
rcv_match/
wake
I/O
125
102
This pin can be configured by software to be:
A general-purpose pin that performs either input or 
output functions. 
A status pin that provides an LED that indicates a 
receive packet has passed address recognition.
This pin can also be controlled by PME_Enable bit 
(Func0_HwOptions<3>) in the serial ROM to be a wake-
up event pin that can be connected to pin pme# of the 
PCI connector or pin cstschg of the CardBus connector. 
When this pin is in a wake function, bit 
MiscHwOptions<1> in the serial ROM determines the 
polarity.
gep<3>/link
I/O
126
103
This pin can be configured by software to be:
A general-purpose pin that performs either input or 
output functions. 
A status pin that provides an LED to indicate 
(according to the MiscHWOptions<0> field in the 
Serial ROM):
— Network link integrity state for 10BASE-T or 
100BASE-TX.
— Both network activity and network link integrity 
state. 
An input link status pin for OnNow support. When 
used with an MII PHY device, this pin should be 
connected to the MII PHY link indication pin (the 
21145 interprets a high logic level on this pin as link-
pass). 
This pin should not be left unconnected if it is used as an 
input in the D1, D2, or D3 power states. 
gnt_l
I
29
21
Bus grant asserts to indicate to the 21145 that access to 
the bus is granted.
hr_rx_n
I
175
143
HomePNA negative differential receive input from the 
phone line.
hr_rx_p
I
174
142
HomePNA positive differential receive input from the 
phone line.
hr_txn
O
12
12
HomePNA negative differential transmit output to phone 
line.
hr_txnh
O
14
14
HomePNA high power negative differential transmit 
output to phone line.
hr_txp
O
11
11
HomePNA positive differential transmit output to phone 
line.
hr_txph
O
13
13
HomePNA high power positive differential transmit output 
to phone line.
idsel
I
42
34
Initialization device select asserts to indicate that the host 
is issuing a configuration cycle to the 21145.
Table 1. Functional Description of 21145 Signals (Sheet 3 of 8)
Signal
Type
Pin 
Number, 
176-pin
Pin 
Number, 
144-pin
Description