max9132 Maxim Integrated Products, Inc., max9132 Datasheet - Page 11

• Manufacturer Part Number: max9132
• Description: Programmable, High-speed, Multiple Input/output Lvds Crossbar Switches
• Manufacturer: Maxim Integrated Products, Inc.

The MAX9132/MAX9134/MAX9135 operate as slaves
that send and receive data through I
The interface uses a serial-data line (SDA) and a serial-
clock line (SCL) to achieve bidirectional communication
between master(s) and slave(s). A master (typically a
microcontroller) initiates all data transfers to and from
the slave and generates the SCL clock that synchro-
nizes the data transfer. The SDA line operates as both
an input and an open-drain output. A pullup resistor,
typically 4.7kΩ, is required on SDA. The SCL line oper-
ates only as an input. A pullup resistor is required on
SCL if there are multiple masters on the I
if the master in a single-master system has an open-
drain SCL output. Each transmission consists of a
START condition sent by a master, followed by the 7-bit
slave address plus R/W bit, a register address byte, a
Table 2b. I
REGISTER
ADDRESS
0x01
0x02
2
C Switch Routing Control Registers for the MAX9135
______________________________________________________________________________________
REGISTER BIT(S)
Input/Output LVDS Crossbar Switches
D[6:4]
D[2:0]
D[7:4]
D[2:0]
D7
D3
D3
Programmable, High-Speed, Multiple
2
C (see Figure 1).
I
2
2
C Interface
C interface, or
DOUT1 Preemphasis
DOUT0 Preemphasis
DOUT2 Preemphasis
DOUT1 Routing
DOUT0 Routing
DOUT2 Routing
DESCRIPTION
Connection
Connection
Connection
Reserved
data byte, and finally a STOP condition. Table 3 shows
the slave address selection by the AS0 and AS1 pins.
A write to the MAX9132/MAX9134/MAX9135 comprises
the transmission of the slave address with the R/W bit
set to 0, followed by at least 1 byte of information. The
first byte of information is the command byte. The com-
mand byte determines which registers of the
MAX9132/MAX9134/MAX9135 are to be written by the
next byte, if received. If a STOP condition is detected
after the command byte is received, the MAX9132/
MAX9134/MAX9135 take no further action beyond stor-
ing the command byte. Any bytes that are received
after the command byte are data bytes. The first data
byte goes into the internal register of the crossbar
switch selected by the command byte (Figure 2). If
VALUE
0000
000
001
010
011
100
000
001
010
011
100
000
001
010
011
100
0
1
0
1
0
1
Data Format for Writing to the Slave
DOUT1 connected to DIN1
DOUT1 connected to DIN0
DOUT1 connected to DIN2
DOUT1 connected to DIN3
DOUT0 connected to DIN1
DOUT0 connected to DIN0
DOUT0 connected to DIN2
DOUT0 connected to DIN3
DOUT2 connected to DIN1
DOUT2 connected to DIN0
DOUT2 connected to DIN2
DOUT2 connected to DIN3
DOUT1 preemphasis off
DOUT1 preemphasis on
DOUT0 preemphasis off
DOUT0 preemphasis on
DOUT2 preemphasis off
DOUT2 preemphasis on
DOUT1 not connected
DOUT0 not connected
DOUT2 not connected
Set these bits to 0000
FUNCTION
11