1.0 Pin Information (Continued)
1.2 Pin Description
Table 1. NRZ CONTROLLER INTERFACE and MANAGEMENT INTERFACE.
These pins provide the interface signalling between the Media Access Controller and the transceiver. (30 Pins)
Symbol
TXC
Pin #
Type
Description
77
O
Transmit Clock: This pin outputs a 10 MHz outputclock signal synchronized to the
transmit data (for all ports).
TXD[4]
TXD[3]
TXD[2]
TXD[1]
40
46
56
71
I
I
Transmit Data: The serial TXD contains the transmit serial data output stream.
TXE[4]
TXE[3]
TXE[2]
TXE[1]
41
47
57
72
Transmit Enable:This active high inputindicates the presenceof validdata on the TXD
pins.
CRS[4]
CRS[3]
CRS[2]
CRS[1]
43
52
59
74
O, pull-up Carrier Sense: Active high output indicates that valid data has been detected on the
O, pull-up receive inputs.
O, pull-up
O, pull-up
CRS[3:1] are dual purpose pins. When RESET is active, the value on these pins are
sampled to determine the transceiver address for the mgmt interface. These pins have
internal pull-ups, a 2.7 kΩ pull down resistor is required to program a logic ‘0’.
COL[4]
COL[3]
COL[2]
COL[1]
44
54
60
75
O, pull-up Collision: This active high output is asserted when a collision condition has been de-
O, pull-up tected. It is also asserted for 1µs at the endof a packetto indicate the SQEtest function.
O, pull-up
O, pull-up
COL[4:1] are dual purpose pins. When RESET is active, these pins are sampled and
selects the operating mode for the device. These pins have internal pull-ups to select
the default mode if no external pull-downs are connected. To select the non-default
mode(s), a 2.7 kΩ pull down resistor(s) is required. The strappable functions are:
COL[4]; selects the number of receive clocks after carrier sense deassertion (5 RXCs
or continuous RXCs). Default is 5 RXCs.
COL[3]; enables or disables the receive filter. Default is to disable the receive filter.
COL[2]; Disables Management Interface and selects the FullDuplex operating mode
(normal or enhanced). Default is normal full duplex mode. If the enhanced Full- Duplex
mode is selected, the functions of pins 89, 90, 92, 93, and 94 are also changed. See
the descriptions in Sectio n3.3.13 and Se ction3.3.14.
COL[1]; selects the LED operating mode (normal or enhanced). Default is normal LED
mode.
RXC[4]
RXC[3]
RXC[2]
RXC[1]
45
55
61
76
O
Receive Clock: This 10 MHz signal is generated by the transceiver, and is the recov-
ered clock from the decoded network data stream. This signal is 10 MHz.
The number of RXCs after the deassertion of CRS is programmable via the Global Con-
figuration Register, GATERXC bit, D0. The options are for 5 RXCs or continuous RXCs.
RXD[4]
RXD[3]
RXD[2]
RXD[1]
42
51
58
73
O, Pull-up Receive Data: Provides the decoded receive serial data. Data is valid on the risin
edge of RXC.
RXD[4:1] are dual purpose pins. When RESET is active, these pins are sampledand
selects the operating mode for the device. These pins have internal pull-ups to select
the default mode if no external pull-downs are connected. To select the non-default
mode(s), a 2.7 kΩ pull down resistor(s) is required. The strappable functions are:
RXD[4] enables/disables Auto-Negotiation.
RXD[3:1] selects one of five MAC interface modes. See the table in the Interface De-
scriptions section.
MDC
LPBK
93
I
Management Data Clock: When management interface is enabled (strap option,
COL[2]=1), this clock signal (0-2.5MHz) is the clock for transferring data across the
management interface.
LoopBack: When “Disable Management Interface” mode is selected (strap option,
COL[2]=0), then this pin is an active high input to configure all ports into diagnostic loop-
back mode.
5
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