NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 132

• 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

SDRAM read cycles
1 2 0
S D R A M
Figure 11 and Figure 12 provide timing examples for SDRAM normal and burst reads,
respectively, with WAIT and BCYC configured with a value of 0.
Figure 11: SDRAM normal read
TEA_(LAST_) {output}
TEA_(LAST_) {input}
CAS3_(RAS_)
CAS2_(CAS_)
CAS1_(WE_)
TA_ {output}
TA_ {input}
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
CS[7:0]_
BE[3:0]
D[31:0]
A[13:0]
AMUX
BCLK
RW_
TS_
precharge
One Valid Per Cycle
activate
read
bstop