88E1111-XX-BAB-C000 MARVELL [Marvell Technology Group Ltd.], 88E1111-XX-BAB-C000 Datasheet - Page 12

• Manufacturer Part Number: 88E1111-XX-BAB-C000
• Description: Integrated 10/100/1000 Ultra Gigabit Ethernet Transceiver
• Manufacturer: MARVELL [Marvell Technology Group Ltd.]

Table 2:
The GMII interface supports both 1000BASE-T and 1000BASE-X modes of operation. The GMII interface pins are
also used for the TBI interface. See
Doc. No. MV-S105540-00, Rev. --
Page 12
117-T FBGA
Pi n #
E2
D1
E1
F2
GMII/MII Interfaces
96 -BCC
Pin #
8
4
9
7
88E1111 Product Brief
Integrated 10/100/1000 Ultra Gigabit Ethernet Transceiver
128 -PQF P
P i n #
14
10
16
13
Document Classification: Proprietary Information
Table 3
Pin Name
GTX_CLK
TX_CLK
TX_EN
TX_ER
for TBI pin definitions. The MAC interface pins are 3.3V tolerant.
Pin
Typ e
I
O, Z
I
I
Desc ription
GMII Transmit Clock. GTX_CLK provides a
125 MHz clock reference for TX_EN,
TX_ER, and TXD[7:0]. This clock can be
stopped when the device is in 10/100BASE-
T modes, and also during Auto-Negotiation.
MII Transmit Clock. TX_CLK provides a 25
MHz clock reference for TX_EN, TX_ER,
and TXD[3:0] in 100BASE-TX mode, and a
2.5 MHz clock reference in 10BASE-T
mode.
TX_CLK provides a 25 MHz, 2.5 MHz, or 0
MHz clock during 1000 Mbps Good Link,
Auto-Negotiation, and Link Lost states
depending on the setting of register 20.6:4.
The 2.5 MHz clock is the default rate, which
may be programmed to another frequency
by writing to register 20.6:4.
GMII and MII Transmit Enable. In GMII/MII
mode when TX_EN is asserted, data on
TXD[7:0] along with TX_ER is encoded and
transmitted onto the cable.
TX_EN is synchronous to GTX_CLK, and
synchronous to TX_CLK in 100BASE-TX
and 10BASE-T modes.
GMII and MII Transmit Error. In GMII/MII
mode when TX_ER and TX_EN are both
asserted, the transmit error symbol is trans-
mitted onto the cable. When TX_ER is
asserted with TX_EN de-asserted, carrier
extension symbol is transmitted onto the
cable.
TX_ER is synchronous to GTX_CLK, and
synchronous to TX_CLK in 100BASE-TX
and 10BASE-T modes.
Copyright © 2009 Marvell
March 4, 2009, Advance