NS7520B-1-C36 Digi International, NS7520B-1-C36 Datasheet - Page 135

• 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

Figure 14: SDRAM burst write
TEA_(LAST_) {output}
TEA_(LAST_) {input}
The precharge command is issued, when necessary, during the T1 phase of a
normal or burst write cycle. The precharge command is issued only when
the row selection for the chip select has changed since the last address.
Each chip select maintains a 14-bit register identifying the last row
accessed. Additional clock cycles are inserted between the precharge
command and the active command, depending on the WAIT configuration.
The active command is always issued after the precharge command. The
active command selects a newly activated row address. Additional clock
cycles are inserted between the active command and the read command,
depending on the WAIT configuration.
CAS3_(RAS_)
CAS2_(CAS_)
CAS1_(WE_)
TA_ {output}
TA_ {input}
CS[7:0]_
BE[3:0]
D[31:0]
A[13:0]
AMUX
BCLK
RW_
TS_
nop
write
One Valid Per Cy cle
write
w w w . d i g i e m b e d d e d . c o m
write
M e m o r y C o n t r o l l e r M o d u l e
write
nop
in hi bi t
1 2 3