RTL8169
2002/03/27
Rev.1.21
10
5.4 LED Interface
Symbol
Type
Pin No
Description
LED3-0
O 114-116,
118
LED pins
(Active low)
1000BaseT mode:
LEDS1-
0
00
01
10
11
LED0
Tx/Rx ACT(Tx/Rx) Tx
LINK10/ACT
LED1
LINK100 LINK10/100/
1000
LINK10/100/
1000
LINK100/ACT
LED2
LINK10 FULL
Rx
FULL
LED3
LINK1000 -
FULL
LINK1000/ACT
TBI mode:
LEDS1-
0
00
01
10
11
LED0
ACT ACT Tx
-
LED1
- LINK
LINK
-
LED2
- FULL Rx FULL
LED3
LINK - FULL LINK
During power down mode, the LED signals are logic high.
5.5 GMII, TBI, PHY CP
Gigabit Media Independent Interface, Ten Bit Interface, PHY Control Pin
Symbol
Type
Pin No
Description
GTxCLK O
145
Gigabit Tx clock:
In GMII mode (1000Mbps Tx clock), GTxCLK is a
continuous clock used for operation at 1000Mbps. GTxCLK provides
the timing reference for the transfer of the TxEN, TxER, and TxD
signals. The values of TxEN, TxER, and TxDs are sampled by the PHY
on the rising edge of GTxCLK.
In GMII mode or TBI mode, the GTxCLK can be used as a 125MHz
reference clock, and it used as the 125MHz transmit clock to an external
PMD and is the reference for transmit TBI signaling.
TxCLK I 147
Transmit Clock (MII mode only):
TxCLK is a continuous clock that
provides a timing reference for the transfer of TxD[3:0], TxEN. In MII
mode, it uses the 25MHz or 2.5MHz supplied by the external PMD
device.
TxEN/
Tx[9]
O 143
Transmit Enable:
In GMII mode (or MII mode), the assertion of TxEN
indicates that the RTL8169 is presenting data on the GMII (or MII) for
transmission. TxEn is asserted synchronously with the first octet (or
nibble) of the preamble and remains asserted while all octets (or
nibbles) to be transmitted are presented to the GMII (or MII).
This signal is synchronous to TxCLK and provides precise framing for
data carried on TXD3-0/TXD7-0 for the external PMD. It is asserted
when TXD3-0/TXD7-0 contains valid data to be transmitted.
Tx[9]:
In TBI mode, Tx[9] is the MSB of the 10-bit vector representing
one transmission code-group. Tx[0] is the first bit to be transmitted, and
Tx[9] is the last bit to be transmitted.
Tx[8] O 146
Tx[8] (TBI mode only):
In TBI mode, Tx[8] is one of the 10-bit vector
representing one transmission code-group.
cont...