NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 290

• 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 7 8
T i m i n g D i a g r a m s
SDRAM read
SDRAM read, CAS latency = 2
Notes:
1
2
3
4
5
TEA*/LAST* (Note-5)
Non-muxed address
CAS0* (A10/AP)
BE[3:0]* (DQM)
Muxed address
Port size determines which byte enable signals are active:
–
–
–
The precharge and/or active commands are not always present. These
commands depend on the address of the previous SDRAM access.
If CAS latency = 3, 2 NOPs occur between the read and burst terminate
commands.
If CAS latency = 3, 3 inhibits occur after burst terminate.
The TA* and TEA*/LAST signals are for reference only.
PortA2/AMUX
CAS3* (RAS)
CAS2* (CAS)
TA* (Note-5)
CAS1* (WE)
read D[31:0]
CS[4:0]*
8-bit port = BE3*
16-bit port = BE[3:2]
32-bit port = BE[3:0]
BCLK
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
RW*
6
35
36
27
34
34
12
prechg
T1
34
34
active
A10
37
35
34
34
34
read
37
34
34
nop
30
31
34
bterm
T2
10
30
31
36
27
34
11
inhibit
inhibit
T1