NS7520B-1-I46 Digi International, NS7520B-1-I46 Datasheet - Page 274

• 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

2 6 2
A C c h a r a c t e r i s t i c s
Figure 30: System configuration for specified timing
Table 100: System loading details
Exceeding the loading shown in Table 100 can result in additional signal delay. The
delay can be approximated by derating the output buffer based on the expected load
capacitance per the values shown in Table 101.
BCLK
A[27:0], CAS[3:0]_
CS[4:0]_
DATA[31:0]
BE*_
TS_, TA_, TEA_, BR_, BG_, BUSY_, WE_,
OE_
PORTA3, PORTA1, PORTC3, PORTC1
(operating external DMA)
Other PORTA[*] and PORTC[*], TDO
MDC, MDIO, TXEN, TXER, TXD[3:0]
Signal
NS7520
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
SDRAM
23
23
13
18
19
15
15
85
20
Estimated load
(pF)
SDRAM
other
memory
devices
Buffer
Two SDRAMs, 1 clock buffer/clock
input to PLD
Two SDRAM An, 1 buffer/PLD
Two SDRAM CSn, 1 buffer PLD
One SDRAM DQ, 1 buffer/PLD
One SDRAM DQ, 1 buffer/PLD
1 buffer/PLD
1 buffer/PLD
Tester load
One PHY
Device loads