NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 130

• 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

Memory timing fields — SDRAM
BSIZE configuration
1 1 8
S D R A M
Table 45: SDRAM command definitions
The WAIT configuration in the Chip Select Option register provides the SDRAM T
and T
precharge commands can be followed immediately by another command on the next
active edge of BCLK. When WAIT is configured with a value larger than 0, wait states
are inserted after the active and precharge commands before another command can
be issued.
The BCYC configuration in the Chip Select Option register provides the SDRAM CAS
latency parameter. The BCYC field must be set to a value of
can support SDRAMs that have a CAS latency specification between 1 and 4 BCLK
clocks, as shown:
The BSIZE configuration in the Chip Select Option register provides the SDRAM burst
length parameter. The BSIZE field is set as shown:
Load mode
1
2
3
4
00
01
10
Command
CAS latency
BSIZE
RP
parameters. When WAIT is configured with a value of 0, the active and
2 words (not supported)
4 words (not supported)
8 words (not supported)
Burst length
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
0
CSx_
Do not use
01
10
11
BCYC configuration
Op-code
A13:0
0
CAS3_ RAS#
0
CAS2_ CAS#
0
CAS1_ WE#
CAS latency - 1
0
CAS0_ A10/AP
. The NS7520
RCD