NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 321
![no-image](/images/manufacturer_photos/0/1/193/digi_international_sml.jpg)
NS7520B-1-I46
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
NS7520B-1-I46
Manufacturer:
Digi International
Quantity:
10 000
Part Number:
NS7520B-1-I46
Manufacturer:
NETARM
Quantity:
20 000
- Current page: 321 of 338
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Serial port error in 7-bit mode
SDRAM 256 MB mask failure
Erroneous timeouts when loading timer
The NS7520’s serial ports do not function correctly when configured in the 7-bit
mode. The 7-bit transmitter will transmit 8-bit data, and the data in the receive
buffer will be incorrect. The other modes — 8-bit, 6-bit, and 5-bit — all function
correctly.
Workaround
None. Use the 8-bit, 6-bit, or 5-bit modes only.
The NS7520 chip select does not generate the required precharge commands if a
value larger than 128 MB is written in the Chip Select Option register mask word. In
particular, if the SDRAM is located at 0–256M and one read is done at address
another read is done at address
address 0.
Workaround
Mask size
There can be two erroneous timeouts when the timer is first loaded.
Workaround
In most cases, no workaround is required because the error averages out over many
readings. The problem can become critical if you set the timer to a large value, such
as four hours. A workaround for this situation is to program the timer to timeout
twice, with a small value such as 4μ, then load the larger value.
0xF0000
(256 MB) should not be used.
0x0
, there is no precharge for the read at
w w w . d i g i e m b e d d e d . c o m
N S 7 5 2 0 E r r a t a
0x400
and
3 0 9
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