NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 69

• Manufacturer Part Number: NS7520B-1-C36
• Description: IC ARM MICROPROCESSOR 177BGA
• Manufacturer: Digi International
• Series: NET+ARM®r

Specifications of NS7520B-1-C36

• 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

PLL Control register: Setting the PLL frequency with the PLL Control register
Notes:
1
2
3
4
With this method, the PLL Settings register is configured by writing to the PLL Control
register, FFB0 0008.
Table 22: PLL Control register bit definition
The PLL frequency can be changed by writing to the PLLCNT field in the PLL Control
register. At bootup, the default value in the PLLCNT field has no affect on the PLL
frequency. This is because the PLL frequency set on bootup is based on the state of
address lines A[8:0]. The value in the PLLCNT field must be rewritten to change the
D31:28
D27:24
D23:00
Bits
15
31
Digi guarantees that the NS7520B-1-C36 will work at all frequencies up to
36.9MHz.
Digi guarantees that the NS7520B-1-C46 will work at all frequencies up to
46.1MHz.
Digi guarantees that the Ns7520B-1-C55 will work at all frequencies up to
55.3MHz.
55.3MHz is the default frequency when address lines A[8:0] are not adjusted
with pulldown resistors.
30
14
Reserved
N/A
R/W
N/A
Access
29
13
28
12
Reserved
PLLCNT
Reserved
Mnemonic
27
11
26
10
PLLCNT
N/
0x9
N/A
Reset
25
9
24
8
Reserved
N/A
SYS_CLK frequency
Writing to this field affects the PLL frequency. See the
discussion following this table.
N/A
Description
w w w . d i g i e m b e d d e d . c o m
23
7
22
6
21
5
20
4
Reserved
19
3
18
2
S Y S M o d u l e
17
1
16
0
5 7