System bus interface signal descriptions RW_ D6 I/O 2 Transfer direction BR_ D7 NO CONNECT BG_ C7" />
參數(shù)資料
型號(hào)： NS7520B-1-C55
廠商： Digi International
文件頁數(shù)： 5/68頁
文件大?。?/td> 0K
描述： IC ARM MICROPROCESSOR 177BGA
標(biāo)準(zhǔn)包裝： 160
系列： NET+ARM®
應(yīng)用： 網(wǎng)絡(luò)處理器
核心處理器： ARM7
程序存儲(chǔ)器類型： 外部程序存儲(chǔ)器
RAM 容量： 外部
接口： EBI/EMI，以太網(wǎng)，DMA，SPI，UART
輸入/輸出數(shù)： 16
電源電壓： 1.4 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 177-LFBGA
包裝： 托盤
供應(yīng)商設(shè)備封裝： 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
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NS7520B-1-I46 功能描述:IC ARM MICROPROCESSOR 177BGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器 - 特定應(yīng)用 系列:NET+ARM® 產(chǎn)品變化通告:Product Discontinuation 26/Aug/2009 標(biāo)準(zhǔn)包裝:250 系列:- 應(yīng)用:網(wǎng)絡(luò)處理器 核心處理器:4Kc 程序存儲(chǔ)器類型:- 控制器系列:- RAM 容量:16K x 8 接口:以太網(wǎng)，UART，USB 輸入/輸出數(shù):- 電源電壓:1.8V, 3.3V 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:208-LQFP 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:PG-LQFP-208 其它名稱:SP000314382
NS7520B-1-I55 功能描述:IC ARM MICROPROCESSOR 177BGA RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器 - 特定應(yīng)用 系列:NET+ARM® 產(chǎn)品變化通告:Product Discontinuation 26/Aug/2009 標(biāo)準(zhǔn)包裝:250 系列:- 應(yīng)用:網(wǎng)絡(luò)處理器 核心處理器:4Kc 程序存儲(chǔ)器類型:- 控制器系列:- RAM 容量:16K x 8 接口:以太網(wǎng)，UART，USB 輸入/輸出數(shù):- 電源電壓:1.8V, 3.3V 工作溫度:- 安裝類型:表面貼裝 封裝/外殼:208-LQFP 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:PG-LQFP-208 其它名稱:SP000314382
NS752AL 制造商:Hubbell Wiring Device-Kellems 功能描述:PLATE, 1GANG,W/2 F-CONNECTORS,AL
NS752I 制造商:Hubbell Wiring Device-Kellems 功能描述:PLATE, 1GANG,W/2 F-CONNECTORS,EI
NS752LA 制造商:Hubbell Wiring Device-Kellems 功能描述:PLATE, 1GANG,W/2 F-CONNECTORS,LA
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