Specifications

37Maxim Integrated
HDCP Gigabit Multimedia Serial
Link Serializer/Deserializer
MAX9263/MAX9264
Manual Programming of the
Spread-Spectrum Divider
The modulation rate for the serializer/deserializer relates
to the PCLK_ frequency as follows:
PCLK_
M
f
f (1 DRS)
MOD SDIV
= +
×
where:
f
M
= Modulation frequency
DRS = DRS pin input value (0 or 1)
f
PCLK_
= PCLK_ frequency
MOD = Modulation coefficient given in Table 9 or 10
SDIV = 6- or 5-bit SDIV setting, manually programmed
by the FC
To program the SDIV setting, first look up the modulation
coefficient according to the part number and desired
bus-width and spread-spectrum settings. Solve the
above equation for SDIV using the desired pixel clock
and modulation frequencies. If the calculated SDIV
value is larger than the maximum allowed SDIV value in
Table 9 or 10, set SDIV to the maximum value.
Sleep Mode
The serializer/deserializer include a low-power sleep
mode to reduce power consumption on the device not
attached to the FC (the deserializer in LCD applications
and the serializer in camera applications). Set the cor-
responding remote IC’s SLEEP bit to 1 to initiate sleep
mode. The serializer sleeps immediately after setting
its SLEEP = 1. The deserializer sleeps after serial link
inactivity or 8ms (whichever arrives first) after setting
its SLEEP = 1. See the Link Startup Procedure section
for details on waking up the device for different FC and
starting conditions.
The FC side device cannot enter into sleep mode. If
an attempt is made to program the FC side device for
sleep, the SLEEP bit remains 0. Use the PWDN input
pin to bring the FC side device into a low-power state.
Entering sleep mode resets the HDCP registers, but not
the configuration registers.
Power-Down Mode
The serializer/deserializer include a power-down mode
to further reduce power consumption. Set PWDN low to
enter power-down mode. While in power-down mode, the
Table 9. Serializer Modulation Coefficients and Maximum SDIV Settings
Table 10. Deserializer Modulation Coefficients and Maximum SDIV Settings
BIT-WIDTH MODE
SPREAD-SPECTRUM
SETTING (%)
MODULATION
COEFFICIENT MOD (dec)
SDIV UPPER LIMIT (dec)
32 bit
1 104 40
0.5 104 63
3 152 27
1.5 152 54
4 204 15
2 204 30
24 bit
1 80 52
0.5 80 63
3 112 37
1.5 112 63
4 152 21
2 152 42
SPREAD-SPECTRUM SETTING (%) MODULATION COEFFICIENT (dec) SDIV UPPER LIMIT (dec)
4 208 15
2 208 30