Digi NS9750 - Manual (Page 298)

S y s t e m a t t r i b u t e s
2 7 4 N S 9 7 5 0 H a r d w a r e R e f e r e n c e
reset_done Bootup mode
0 Boot from SDRAM using serial SPI EEPROM
1 Boot from flash/ROM
gpio[19] PLL BP (PLL bypass)
0 PLL bypassed
1 PLL not bypassed
gpio[17], gpio[12],
gpio[10], gpio[8],
gpio[4] PLL ND[4:0] (PLL multiplier, ND+1)
See Table 169: "PLL ND[4:0] multiplier values."
gpio[2], gpio[0] PLL FS[1:0] (PLL frequency select)
GPIO FS Divide by
10 00 1
11 01 2
00 10 4
01 11 8
Register configuration:
gpio 17, 12, 10, 8, 4
Multiplier
11010 32
00100 31
11000 30
11001 29
11110 28
11111 27
11100 26
11101 25
10010 24
10011 23
10000 22
Table 169: PLL ND[4:0] multiplier values
Pin name Configuration bits
Table 168: Configuration pins — Bootstrap initialization