NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 114

• 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

Single cycle read/write
1 0 2
S t a t i c m e m o r y ( S R A M ) c o n t r o l l e r
Static memory (SRAM) controller
Table 39: Chip Select Option Register B bit definition
Each chip select can be configured to operate using a static memory interface. The
SRAM controller supports these features:
Synchronous SRAM cycles are used primarily for peripherals that can use BCLK or
CS[4:0]_ as the data transfer signal. Figure 6 shows synchronous SRAM cycles.
D01:00
Bits
Synchronous mode: Transactions use the rising edge of BCLK
Asynchronous mode: Force OE_ and WE_ pulses to be inside the active low
portion of CS[4:0]_
Burst cycle
Programmable wait states
Programmable base address and chip select size
R/W
Access
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
SYNC
Mnemonic
0
Reset
TA_ input synchronizer
00
01
10
11
Defines the level of synchronization performed
within the NS7520 for TA_ input. Used only
when the chip select is configured for external
TA_ mode.
The NS7520 can process the TA_ input signal
using a 1-stage flip-flop synchronizer, a 2-stage
flip-flop synchronizer, or no synchronizer.
The 1- or 2-stage synchronizers must be used if
the TA_ input is synchronous to the BCLK
signal. (The 2-stage synchronizer is
recommended as it introduces one additional
BCLK of latency in the access cycle.
Description
Reserved
1-stage synchronizer
2-stage synchronizer
Reserved