User manual

TB-7Z-020-EMC Hardware User Manual
18
Rev.1.03
7.3. On-board PLL
The TB-7Z-020-EMC has the on-board PLL. Please refer Figure 7-5.
Using IDT VersaClockIII series, 5V49EE504NLGI is an external PLL. It could memory the setting of PLL
via I2C interface which connected to PS (Processing System) I2C Bus. Please refer to the reference
design of PLL setting and Section 7.4 I2C BUS.
Table 7-3 External PLL settings
OUT#
Connect to
Frequency
Note
0
Not connected
(33MHz)
Not Used
1
Ethernet PHY
25MHz
Do not needs to change settings
2
PL Clock
User Define
Default: 148.5MHz(DVI)
3
PL Clock
User Define
Default: 25MHz
6
USB PHY
26MHz
Do not needs to change settings
Figure 7-6 5V49EE504 EEPROM PROGRAMABLE CLOCK GENERATOR
Feature of IDT 5V49EE504.
• Four internal PLLs
• Each PLL has a 7-bit reference divider and a
12-bit feedback-divider
• Internal non-volatile EEPROM with I2C.
• Input frequency range: 1 MHz to 200 MHz
• Output frequency range: 4.9 kHz to 200 MHz
• Two independently controlled VDDO (1.8V -
3.3V)
• 8-bit output-divider blocks
• Fractional division capability on one PLL
• Two of the PLLs support spread spectrum
generation capability
• Programmable slew rate control
• Programmable loop bandwidth
• Programmable output inversion to reduce
bimodal jitter
• Redundant clock inputs with auto and
manual switchover options
Configuration software is available from IDT web site.