Specifications

34 Maxim Integrated
HDCP Gigabit Multimedia Serial
Link Serializer/Deserializer
MAX9263/MAX9264
Interrupt Control
The INT pin of the serializer is the interrupt output and
the INT pin of the deserializer is the interrupt input. The
interrupt output on the serializer follows the transitions
at the interrupt input. This interrupt function supports
remote-side functions such as touch-screen peripherals,
remote power-up, or remote monitoring. Interrupts that
occur during periods where the reverse control channel
is disabled, such as link startup/shutdown, are automati-
cally resent once the reverse control channel becomes
available again. Bit D4 of register 0x06 in the deserializer
also stores the interrupt input state. The INT output of
the serializer is low after power-up. In addition, the FC
can set the INT output of the serializer by writing to the
SETINT register bit. In normal operation, the state of the
interrupt output changes when the interrupt input on the
deserializer toggles. Do not send a logic-low value lon-
ger than 100Fs in either base or bypass mode to ensure
proper interrupt functionality.
Pre/Deemphasis Driver
The serial line driver in the serializer employs current-
mode logic (CML) signaling. The driver can generate
an adjustable waveform according to the cable length
and characteristics. There are 13 preemphasis settings
as shown in Table 4. Negative preemphasis levels are
deemphasis levels in which the preemphasized swing
level is the same as normal swing, but the no-transition
data is deemphasized. Program the preemphasis lev-
els through register 0x05 D[3:0] of the serializer. This
preemphasis function compensates the high frequency
loss of the cable and enables reliable transmission over
longer link distances. Additionally, a lower power drive
mode can be entered by programming CMLLVL bits
(0x05, D[5:4]) to reduce the driver strength down to
75% (CMLLVL = 10) or 50% (CMLLVL = 01) from 100%
(CMLLVL = 11, default).
Figure 29. Format Conversion Between GMSL UART and I
2
C with Register Address (I2CMETHOD = 1)
: MASTER TO SLAVE
SERIALIZER/DESERIALIZER
SERIALIZER/DESERIALIZER
SERIALIZER/DESERIALIZER
UART-TO-I
2
C CONVERSION OF READ PACKET (I2CMETHOD = 1)
UART-TO-I
2
C CONVERSION OF WRITE PACKET (I2CMETHOD = 1)
FC
SERIALIZER/DESERIALIZERFC
SYNC FRAME
11 11 11 11 11 11 11
1111 11 11 11 11 11
DEVICE ID + RD REGISTER ADDRESS NUMBER OF BYTES
SYNC FRAME DEVICE ID + WR REGISTER ADDRESS NUMBER OF BYTES DATA 0 DATA N ACK FRAME
ACK FRAME DATA 0 DATA N
DATA NADATA 0WADEV IDS AP
PERIPHERAL
PERIPHERAL
S
1118
88
11117 11
8
1117
DEV ID RA AAPDATA 0 DATA N
: SLAVE TO MASTER S: START P: STOP A: ACKNOWLEDGE