Chapter 3: Hardware Description
Table 3-21:
ICS8442 Divisor Switch Settings
R
SW12-9 or
SW12-10 (2)
“N1”
SW10-9 or
SW12-11 (3)
“N0”
Output Divisor
Value
Output Frequency (MHz)
Minimum Maximum
0
0
1
1
0
1
0
1
1
2
4
8
250
125
62.5
31.25
700
350
175
87.5
Notes:
1. A logic “0” is obtained by moving the switch to the “OPEN” position, and a logic “1” is obtained by
moving the switch to the “CLOSED” position.
2. SW12-9 is for the N1 input of Clock Synthesizer 1, and SW12-10 is for the N1 input of Clock
Synthesizer 2.
3. SW10-9 is for the N0 input of Clock Synthesizer 1, and SW12-11 is for the N0 input of Clock Synthesizer
2.
Parallel Mode Operation
Each clock synthesizer has one set of subminiature DIP switches to set the multiplier and
divider settings in parallel mode. Clock Synthesizer 1, with a 10 MHz reference clock
input, can be set to 0x019 through 0x046 , as shown in Table 3-22, page 64 . Clock
Synthesizer 2, with a 25 MHz reference clock input, can be set to 0x00A through 0x01C , as
shown in Table 3-23, page 66 . DIP switches are provided on the board to allow user
selection of multiplier values that result in valid VCO lock ranges. Multiplier bits that
would result in a VCO unlock condition are hardwired to a logic 0 level on the board.
Figure 3-11 shows the locations of the switches for both synthesizers.
62
Virtex-5 FPGA ML555 Development Kit
UG201 (v1.4) March 10, 2008
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IAC5EQ INPUT MODULE AC 10MA 5VDC
IB8RM SURGE SUPP 8OUT 12'CORD W/REMOTE
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