88e3016 Marvell Semiconductor, Inc., 88e3016 Datasheet - Page 32

• Manufacturer Part Number: 88e3016
• Description: Integrated 10/100 Fast Ethernet Transceiver
• Manufacturer: Marvell Semiconductor, Inc.

Table 19:
2.10 Auto MDI/MDIX Crossover
The 88E3016 devices automatically determine whether or not it needs to cross over between pairs so that an
external crossover cable is not required. If the 88E3016 devices interoperate with a device that cannot automati-
cally correct for crossover, the 88E3016 devices make the necessary adjustment prior to commencing Auto-Nego-
tiation. If the 88E3016 devices interoperate with a device that implements MDI/MDIX crossover, a random
algorithm as described in IEEE 802.3 section 40.4.4 determines which device performs the crossover.
When the 88E3016 devices interoperate with legacy 10BASE-T devices that do not implement Auto-Negotiation,
the 88E3016 devices follow the same algorithm as described above since link pulses are present. However, when
interoperating with legacy 100BASE-TX devices that do not implement Auto-Negotiation (i.e. link pulses are not
present), the 88E3016 devices use signal detect to determine whether or not to crossover.
The Auto MDI/MDIX crossover function can be disabled via Register 16.5:4.
The 88E3016 devices are set to MDI mode by default if auto MDI/MDIX crossover is disabled at hardware reset.
The pin mapping in MDI and MDIX modes is specified in Table 19. Refer to
details.
Doc. No. MV-S103164-00, Rev. --
Page 32
Ph ysica l Pin
MDIP/N[1]
MDIP/N[0]
MDI/MDIX Pin Functions
88E3016
Integrated 10/100 Fast Ethernet Transceiver
1 0 0 B A SE - T X
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Document Classification: Proprietary Information
MDIX
CONFIDENTIAL
1 0 B A S E - T
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10 0 B A S E - T X
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Figure 24 on page 98
M DI
Copyright © 2006 Marvell
May 4, 2006, Advance
1 0 B A S E - T
for magnetics
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