78Q2120C09-DB Maxim Integrated Products, 78Q2120C09-DB Datasheet - Page 13

• Manufacturer Part Number: 78Q2120C09-DB
• Description: BOARD DEMO 787Q2120C
• Manufacturer: Maxim Integrated Products

Specifications of 78Q2120C09-DB

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MR1: Status Register
MR3: PHY Identifier Register 2
Page: 13 of 35
MR2: PHY Identifier Register 1
3.15:10
2.15:0
3.9:4
3.3:0
BIT
BIT
BIT
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
SYMBOL TYPE
SYMBOL
SYMBOL
100T2_H
RFAULT
ANEGC
ANEGA
RSVD
MFPS
EXTS
EXTD
[23:6]
LINK
JAB
[5:0]
OUI
OUI
MN
RN
TYPE
TYPE
RC
RC
R
R
R
R
R
R
R
R
R
R
R
R
DEFAULT DESCRIPTION
VALUE
VALUE
000Eh
1Ch
0Ch
9h
(1)
0
0
0
0
0
0
0
0
1
©
DESCRIPTION
Organizationally Unique Identifier:
TERIDIAN Semiconductor Corporation. This register contains the
first 16-bits of the identifier.
DESCRIPTION
Organizationally Unique Identifier: Remaining 6 bits of the OUI.
Model Number: The last 2 digits of the model number 78Q2120C are
encoded into the 6 bits.
Revision Number: The value ‘1001’ corresponds to the ninth revision
of the silicon.
2009 Teridian Semiconductor Corporation
100BASE-T2 Half Duplex Ability:
78Q2120C does not support 100Base-T2 full duplex mode.
Extended Status Information Availability: Reads ‘0’ to indicate the
78Q2120C does not support Extended Status information on MR15.
Reserved
Management Frame Preamble Suppression Support:
indicates that the 78Q2120C can read management frames with a
preamble.
Auto-Negotiation Complete: A logic one indicates that the Auto-
Negotiation process has been completed, and that the contents of
registers MR4,5,6 are valid.
Remote Fault: A logic one indicates that a remote fault condition
has been detected and remains set until it is cleared. This bit can
only be cleared by reading this register (MR1) via the management
interface.
Auto-Negotiation Ability: When set, this bit indicates the device’s
ability to perform Auto-Negotiation.
determined by the ANEGEN bit (MR0.12).
Link Status:
established. If the link status should transition from an OK status to
a NOT-OK status, this bit will become cleared and remains cleared
until it is read.
Jabber Detect: In 10Base-T mode, this bit is set during a jabber
event. After a jabber event, the bit remains set until cleared by a
read operation.
Extended Capability: Reads ’1’ to indicate the 78Q2120C provides
an extended register set (MR2 and beyond).
A logic one indicates that a valid link has been
This value is 00-C0-39 for
Reads ‘0’ to indicate the
The value of this bit is
10/100BASE-TX
Transceiver
78Q2120C
A “0”
Rev 1.3