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IXF1104 Quad-Port 10/100/1000 Mbps Ethernet Media Access Controller
114 Datasheet
Document Number: 278757
Revision Number: 007
Revision Date: March 25, 2004
5.8 LED Interface
The IXF1104 uses a Serial interface, consisting of three signals, to provide LED data to some form
of external driver. This provides the data for 12 separate direct drive LEDs and allows three LEDs
per MAC port.
There are two modes of operation, each with its own separate LED decode mapping. Modes of
operation and LEDs are detailed in the following sections.
5.8.1 Modes of Operation
There are two modes of operation: Mode 0 and Mode 1. Mode selection is accomplished by using
the LED_SEL_MODE bit. This bit is globally selected and controls the operation of all ports (see
Table 109 “LED Control ($0x509)” on page 189).
Mode 0: (LED_SEL_MODE = 0 [Default]): This mode selects operations compatible with the
SGS Thompson M5450 LED Display Driver device. This device converts the serial data stream,
output by the IXF1104, into 30 direct-drive LED outputs. Although the LED interface is capable of
driving all 30 LEDs, only twelve will be driven in the four-port IXF1104, three LEDs per port.
Mode 1: (LED_SEL_MODE = 1): This mode is used with standard TTL (74LS599) or HCMOS
(74HC599) octal shift registers with latches, providing the most general and cost-effective
implementation of the serial data stream conversion.
In addition to these physical modes of operation, there are two types of specific LED data decodes
available for fiber and copper modes. This option is a global selection and controls the operation of
all ports (see Table 109 “LED Control ($0x509)” on page 189).
5.8.2 LED Interface Signal Description
The IXF1104 LED interface consists of three output signal signals that are 2.5 V CMOS level pads.
Table 31 provides LED signal names, pin numbers, and descriptions.
Figure 28. Random Read
DE VICE
ADDRESS
DEV ICE
ADDRESS
WORD
AD DRES S
I
2
C_Data Line
DUMMY WRI TE
(* = DON' T CARE bit for 1k)
START
S
T
A
R
T
R
E
A
D
S
T
A
R
T
W
R
I
T
E
S
T
O
P
M
S
B
M
S
B
M
S
B
L
S
B
R
/
W
L
S
B
DATAn
L
S
B
A
C
K
N
O
A
C
K
A
C
K
*