NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 131

• 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 Mode register
The JEDEC SDRAM standard requires the SDRAM load mode command to set burst
length to
setting. If you want to set burst length to a value other than
steps:
1
2
3
The load mode command is issued as part of the first memory read cycle loading
page
first memory cycle following power reset.
The SDRAM Mode register is loaded during the first memory cycle to the SDRAM device
after the V bit is set to 1 in the Chip Select Base Address register. The MEM module
loads the SDRAM Mode register with the values shown in Table 46.
Table 46: SDRAM Mode register settings
The load mode command is issued after at least one memory read cycle has been
executed to the SDRAM device.
11
11:9
8:7
6:4
3
2:0
BSIZE
Address
into the SDRAM Control register. The load mode command is executed only on the
Set BSIZE to full page.
Read the address within the range of the chip select.
Set BSIZE to the value you want to use.
full page
Full page
Burst length
CAS latency
Write burst mode
Operating mode
Burst type
Burst length
Field
to recognize burst terminate commands. Not all SDRAMs require this
001 - Single location access
00 - Standard operation
BCYC + 1
0 - Sequential
See "BSIZE configuration" on page 118.
Value
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M e m o r y C o n t r o l l e r M o d u l e
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, follow these
full
1 1 9