MAX9263GCB/V+T Maxim Integrated, MAX9263GCB/V+T Datasheet - Page 56

• Manufacturer Part Number: MAX9263GCB/V+T
• Description: Serializers & Deserializers - Serdes GMSL Serializer w/HDCP Interface
• Manufacturer: Maxim Integrated

56
HDCP Gigabit Multimedia Serial
Link Serializer/Deserializer
*For the short-together case, refer to Application Note 4709: MAX9259 GMSL line-fault detection.
required external resistor connections. LFLT = low when
a line fault is detected and LFLT goes high when the line
returns to normal. The line-fault type is stored in 0x08,
D[3:0] of the serializer. Filter LFLT with the FC to reduce
the detector’s susceptibility to brief ground shifts. The
fault detector threshold voltages are referenced to the
serializer ground. Additional passive components set
the DC level of the cable (Figure 3). If the serializer and
deserializer grounds are different, the link DC voltage
during normal operation can vary and cross one of the
fault detection thresholds. For the fault detection circuit,
select the resistor’s power rating to handle a short to the
battery.
To detect the short-together case, refer to Application
Note 4709: GMSL line-fault detection. Table 19 lists the
mapping for line-fault types.
The deserializer staggers the parallel data outputs to
reduce EMI and noise. Staggering outputs also reduces
the power-supply transient requirements. By default, the
deserializer staggers outputs according to Table 20.
Disable output staggering through the DISSTAG bit
(0x06, D7).
Table 19. Serializer Line-Fault Mapping*
Table 20. Staggered Output Delay
REGISTER
ADDRESS
0x08
DOUT11–DOUT15, DOUT25, DOUT26
DOUT16–DOUT20, DOUT27, DOUT28
DOUT6–DOUT10, DOUT23, DOUT24
DOUT0–DOUT5, DOUT21, DOUT22
Staggered Parallel Data Outputs
D[3:2]
D[1:0]
BITS
PCLKOUT
OUTPUT
LFNEG
LFPOS
NAME
VALUE
The control and configuration inputs on the serial-
izer/deserializer include a pulldown resistor to GND.
Pulldowns are disabled when the device is shut down
(PWDN = low) or put into sleep mode. Keep all inputs
driven or use external pullup/pulldown resistors to pre-
vent additional current consumption and undesired con-
figuration due to undefined inputs.
Both I
to provide a logic-high level. There are tradeoffs between
power dissipation and speed, and a compromise made
in choosing pullup resistor values. Every device connect-
ed to the bus introduces some capacitance even when
the device is not in operation. I
times to go from low to high (30% to 70%) for fast mode,
which is defined for data rates up to 400kbps (see the
I
for details). To meet the fast-mode rise-time requirement,
choose the pullup resistors so that rise time t
R
nized if the transition time becomes too slow. The serial-
izer/deserializer support I
2
00
01
10
11
00
01
10
11
PULLUP
C specifications in the Electrical Characteristics table
DISSTAG = 0
2
OUTPUT DELAY RELATIVE TO DOUT0 (ns)
C/UART open-drain lines require pullup resistors
x C
Choosing I
0.75
0.5
1.5
Negative cable wire shorted to supply voltage.
Negative cable wire shorted to ground.
Normal operation.
Negative cable wire disconnected.
Positive cable wire shorted to supply voltage.
Positive cable wire shorted to ground.
Normal operation.
Positive cable wire disconnected.
0
1
BUS
< 300ns. The waveforms are not recog-
2
LINE-FAULT TYPE
Internal Input Pulldowns
C/UART Pullup Resistors
2
C/UART rates up to 1Mbps.
2
C specifies 300ns rise
DISSTAG = 1
0
0
0
0
0
R
= 0.85 x