参数资料
型号: NS7520B-1-C55
厂商: Digi International
文件页数: 5/68页
文件大小: 0K
描述: IC ARM MICROPROCESSOR 177BGA
标准包装: 160
系列: NET+ARM®
应用: 网络处理器
核心处理器: ARM7
程序存储器类型: 外部程序存储器
RAM 容量: 外部
接口: EBI/EMI,以太网,DMA,SPI,UART
输入/输出数: 16
电源电压: 1.4 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 177-LFBGA
包装: 托盘
供应商设备封装: 177-BGA(13x13)
Sys t e m Bus in te rface
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9
System bus interface signal descriptions
RW_
D6
I/O
2
Transfer direction
BR_
D7
NO CONNECT
BG_
C7
NO CONNECT
BUSY_
B7
NO CONNECT
Mnemonic
Signal
Description
BCLK
Bus clock
Provides the bus clock. All system bus interface signals are
referenced to the BCLK signal.
ADDR[27:0]
Address bus
Identifies the address of the peripheral being addressed by the
current bus master. The address bus is bi-directional.
DATA[31:0]
Data bus
Provides the data transfer path between the NS7520 and external
peripheral devices. The data bus is bi-directional.
Recommendation: Less than x32 (S)DRAM/SRAM memory
configurations. Unconnected data bus pins will float during memory
read cycles. Floating inputs can be a source of wasted power.
For other than x32 DRAM/SRAM configurations, the unused data
bus signals should be pulled up.
TS_
Transfer start
NO CONNECT
BE_
Byte enable
Identifies which 8-bit bytes of the 32-bit data bus are active during
any given system bus memory cycle. The BE_ signals are active low
and bi-directional.
TA_
Transfer acknowledge
Indicates the end of the current system bus memory cycle. This
signal is driven to 1 prior to
tri-stating its driver.
TA_ is bi-directional.
TEA_
Transfer error
acknowledge
Indicates an error termination or burst cycle termination:
In conjunction with TA_ to signal the end of a burst cycle.
Independently of TA_ to signal that an error occurred during the
current bus cycle. TEA_ terminates the current burst cycle.
This signal is driven to 1 prior to tri-stating its driver.
TEA_ is bi-directional. The NS7520 or the external peripheral can
drive this signal.
RW_
Read/write indicator
Indicates the direction of the system bus memory cycle. RW_ high
indicates a read operation; RW_ low indicates a write operation. The
RW_ signal is bi-directional.
BR_
Bus request
NO CONNECT
BG_
Bus grant
NO CONNECT
BUSY_
Bus busy
NO CONNECT
Symbol
Pin
I/O
OD
Description
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NS7520B-1-I46 IC ARM MICROPROCESSOR 177BGA
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