LAN91C111-NU Standard Microsystems (SMSC), LAN91C111-NU Datasheet - Page 72
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LAN91C111-NU
Manufacturer Part Number
LAN91C111-NU
Description
Manufacturer
Standard Microsystems (SMSC)
Datasheet
1.LAN91C111-NU.pdf
(128 pages)
Specifications of LAN91C111-NU
Operating Supply Voltage (typ)
3.3V
Operating Supply Voltage (min)
3.135V
Operating Supply Voltage (max)
3.465V
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Pin Count
128
Lead Free Status / RoHS Status
Compliant
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Revision 1.91 (06-01-09)
SYMBOL
REGAD[4:0]
TA1
TA0
D[15:0]....
NAME
Register
Address
Turnaround
Time
Data
DEFINITION
If REGAD[4:0] = 00000-11110, these bits determine the specific
register from which D[15:0] is read/written. If multiple register access
is enabled and REGAD[4:0] = 11111, all registers are read/written in
a single cycle.
These bits provide some turnaround time for MDIO
When READ = 1, TA[1:0] = Z0
When WRITE = 1, TA[1:0] = 10
The turnaround time is a 2 bit time spacing between the Register
Address field and the Data field of a management frame to avoid
contention during a read transaction. For a read transaction, both the
STA and the PHY shall remain in a high impedance state for the first
bit time of the turnaround. The PHY shall drive a zero bit during the
second bit time of the turnaround of a read transaction. During a
write transaction, the STA shall drive a one bit for the first bit time of
the turnaround and a zero bit for the second bit time of the
turnaround.
These 16 bits contain data to/from one of the eleven registers
selected by register address bits REGAD[4:0].
DATASHEET
72
10/100 Non-PCI Ethernet Single Chip MAC + PHY
SMSC LAN91C111 REV C
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