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57
SYS Module
Notes:
1
Digi guarantees that the NS7520B-1-C36 will work at all frequencies up to
36.9MHz.
2 Digi guarantees that the NS7520B-1-C46 will work at all frequencies up to
46.1MHz.
3 Digi guarantees that the Ns7520B-1-C55 will work at all frequencies up to
55.3MHz.
4 55.3MHz is the default frequency when address lines A[8:0] are not adjusted
with pulldown resistors.
PLL Control register: Setting the PLL frequency with the PLL Control register
With this method, the PLL Settings register is configured by writing to the PLL Control
register, FFB0 0008.
147.5 10 11 11 00 01011 1000000 0X0000019F
MHz A[8:7] IS A[6:5] FS A[4:0] ND+1 PLL Settings reg Notes
Bits Access Mnemonic Reset Description
D31:28 N/A Reserved N/ N/A
D27:24 R/W PLLCNT 0x9 SYS_CLK frequency
Writing to this field affects the PLL frequency.
See the discussion following this table.
D23:00 N/A Reserved N/A N/A
Table 22: PLL Control register bit definition
13121110987654321015 14
31 29 28 27 26 25 24 23 22 21 20 19 18 17 1630
Reserved ReservedPLLCNT
Reserved