NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 107

• 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

Table 37: Chip Select Base Address register bit definition
D05
D04
D03
D02
D01
Bits
R/W
R/W
R/W
R/W
R/W
Access
DMUXM
IDLE
DRSEL
BURST
WP
Mnemonic
0
0
0
0
0
Reset
w w w . d i g i e m b e d d e d . c o m
DRAM internal address multiplexer mode
0
1
Controls which DRAM address multiplexing
style is used for this DRAM memory peripheral.
See "NS7520 DRAM address multiplexing" on
page 105 for more information.
Force BCLK at end of memory cycle
Responds to read and write, but has no effect on
memory controller operation.
DRAM select
Configures the memory peripheral to operate in
DRAM mode.
WE CTRL and OE CTRL bits are ignored in
DRAM mode; they are used only when DRSEL
is set to 0.
Burst memory cycle enable
Controls whether the memory peripheral device
supports bursting.
Write-protect the chip select
Prevents any bus master from writing to the
memory device. When set to 1, all memory
write-cycles are terminated immediately with a
data-abort indicator.
The WP bit can protect non-volatile memory
devices such as flash and EEPROM.
Description
10 CAS
8 CAS
When set to 0, burst cycles are not allowed.
All memory cycles are single cycles.
When set to 1, burst cycles are allowed.
M e m o r y C o n t r o l l e r M o d u l e
9 5