參數(shù)資料
型號(hào)： LH79520N0Q000B1
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 數(shù)學(xué)處理器
英文描述： System-on-Chip
封裝： LH79520N0Q000B1<SOT1017-1 (LQFP176)|<<http://www.nxp.com/packages/SOT1017-1.html<1<Always Pb-free,;
文件頁(yè)數(shù)： 31/59頁(yè)
文件大?。?/td> 666K
代理商： LH79520N0Q000B1
System-on-Chip
LH79520
Preliminary data sheet
Rev. 01
—
16 July 2007
31
NXP Semiconductors
Static Memory Controller Waveforms
nWAIT INPUT
The Static Memory Controller (SMC) supports an
nWAIT input that can be used by an external device to
extend the wait time during a memory access. The
SMC samples nWAIT at the beginning of at the begin-
ning of each system clock cycle. The system clock
cycle in which the nCSx signal is asserted counts as
the first wait state. See Figure 11.
The SMC recognizes that nWAIT is active within 2
clock cycles after it has been asserted. To assure that
the current access (read or write) will be extended by
nWAIT, at least two wait states must be programmed
for this bank of memory. If N wait states are pro-
grammed, then the Static Memory Controller (SMC)
holds this state for N system clocks, or until the SMC
detects that nWAIT is inactive, whichever occurs last.
As the number of wait states programmed increases,
the amount of delay before nWAIT must be asserted
also increases. If only 2 wait states are programmed,
then nWAIT must be asserted in the clock cycle imme-
diately following the clock cycle during which the nCSx
signal is asserted. Once the SMC detects that the
external device has deactivated nWAIT, the SMC will
complete its access in 3 system clock cycles.
The formula for the allowable delay between assert-
ing nCSx and asserting nWAIT is:
tASSERT = (system clock period) × (Wait States - 1)
(where Wait States is from 2 to 31.)
READ AND WRITE WAVEFORMS
Figure 12 shows the waveform and timing for an
External Static Memory Write. Figure 13 shows the
waveform and timing for an External Static Memory
Read, with one Wait State. Figure 14 shows the wave-
form and timing for an External Static Memory Read,
with two Wait States.
The signal tIDD is shown without a setup time, as
measurements are made from the Address Valid point
and HCLK is an internal signal, shown for reference only.
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參數(shù)描述
LH79520N0Q000B1,55 功能描述:IC ARM7 BLUESTREAK MCU 176LQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:BlueStreak ; LH7 標(biāo)準(zhǔn)包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設(shè)備:POR，PWM，溫度傳感器，WDT 輸入/輸出數(shù):21 程序存儲(chǔ)器容量:40KB（20K x 16） 程序存儲(chǔ)器類(lèi)型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 6x12b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤(pán) 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323
LH79520N0Q000B1,551 制造商:NXP Semiconductors 功能描述:
LH79520N0Q000B1,557 制造商:NXP Semiconductors 功能描述:SOC Microcontroller 1.98V 176-Pin LQFP
LH79520N0Q000B1;55 功能描述:ARM微控制器 - MCU LCD EXT BUS 3 UART RoHS:否 制造商:STMicroelectronics 核心:ARM Cortex M4F 處理器系列:STM32F373xx 數(shù)據(jù)總線寬度:32 bit 最大時(shí)鐘頻率:72 MHz 程序存儲(chǔ)器大小:256 KB 數(shù)據(jù) RAM 大小:32 KB 片上 ADC:Yes 工作電源電壓:1.65 V to 3.6 V, 2 V to 3.6 V, 2.2 V to 3.6 V 工作溫度范圍:- 40 C to + 85 C 封裝 / 箱體:LQFP-48 安裝風(fēng)格:SMD/SMT
LH79520N0Q000B155 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述:
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