NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 260

• Manufacturer Part Number: NS7520B-1-I46
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-I46

• Applications: Network Processor
• Core Processor: ARM7
• Program Memory Type: External Program Memory
• Controller Series: -
• Ram Size: External
• Interface: EBI/EMI, Ethernet, DMA, SPI, UART
• Number Of I /o: 16
• Voltage - Supply: 1.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 177-LFBGA
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

2 4 8
S e r i a l C h a n n e l r e g i s t e r s
FXTALE = xtal/5 = 18.432MHz/5 = 3.6864MHz
This does not change with speed grade.
With the 18.432MHz crystal using SYSCLK as the clock source:
Max. baudrate depends on speed grade. Max. programmable baudrate = SYSCLK/32;
max recommended baudrate is 922K.
16X
8X
16X @ 55.296MHz
16X @ 46.08MHz
N S 7 5 2 0 H a r d w a r e R e f e r e n c e , R e v G 9 / 2 0 0 7
Fbrg = FXTALE/[2 * 16 * (N+1)]
115200 = 3686400/2*16*(N+1)
2*16*(N+1) = 3686400/115200
2*16*(N+1) = 32
N = 32/32-1 = 0
Max baudrate @ 16X = 115.2K
Fbrg = FXTALE/[2 * 8 * (N+1)]
230400 = 3686400/2*8*(N+1)
2*8*(N+1) = 3686400/230400
2*8*(N+1) = 16
N = 16/16-1 = 0
Max baudrate @ 8X = 230.4K
Fbrg = SYSCLK/[2 * 16 * (N+1)]
1728000 = 55296000/2*16*(N+1)
2*16*(N+1) = 55296000/1728000
2*16*(N+1) = 32
N = 32/32-1 = 0
Max programmable baudrate = 1,728K
Fbrg = SYSCLK/[2 * 16 * (N+1)]
1440000 = 46080000/2*16*(N+1)
2*16*(N+1) = 46080000/1440000
2*16*(N+1) = 32
N = 32/32-1 = 0
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