參數(shù)資料
型號: MCIMX258CJM4
廠商: Freescale Semiconductor
文件頁數(shù): 96/153頁
文件大?。?/td> 0K
描述: MPU IMX25 IND 400-MAPBGA
特色產(chǎn)品: MCIMX25 Applications Processors
標(biāo)準(zhǔn)包裝: 90
系列: i.MX25
核心處理器: ARM9
芯體尺寸: 32-位
速度: 400MHz
連通性: 1 線,CAN,EBI/EMI,以太網(wǎng),I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外圍設(shè)備: DMA,I²S,LCD,POR,PWM,WDT
輸入/輸出數(shù): 128
程序存儲器類型: 外部程序存儲器
RAM 容量: 144K x 8
電壓 - 電源 (Vcc/Vdd): 1.15 V ~ 1.52 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 3x12b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 400-LFBGA
包裝: 托盤
i.MX25 Applications Processor for Consumer and Industrial Products, Rev. 10
Freescale Semiconductor
47
To meet timing requirements, a number of timing parameters must be controlled. See Table 38 for details
on timing parameters for MDMA read and write modes.
3.7.2.3
Ultra DMA (UDMA) Mode Timing
UDMA mode timing is more complicated than PIO mode or MDMA mode. In this section, timing
diagrams for UDMA in- and out-transfers are provided.
Table 38. Timing Parameters for MDMA Read and Write Modes
ATA
Parameter
MDMA Read1
and Write2
Timing
Parameters
Relation
Adjustable
Parameter(s)
tm, ti
tm
tm(min.) = ti(min.) = time_m
× T – (tskew1 + tskew2 + tskew5)
time_m
td
td, td1
td1(min.) = td(min.) = time_d
× T – (tskew1 + tskew2 + tskew6)
time_d
tk
tk(min.) = time_k
× T – (tskew1 + tskew2 + tskew6)
time_k
t0
t0(min.) = (time_d + time_k)
× T
time_d, time_k
tg(read)
tgr
tgr(min.–read) = tco + tsu + tbuf + tbuf + tcable1 + tcable2
tgr(min.–drive) = td – te(drive)
time_d
tf(read)
tfr
tfr(min.–drive) =0 k
tg(write)
tg(min.–write) = time_d
× T –(tskew1 + tskew2 + tskew5)
time_d
tf(write)
tf(min.–write) = time_k
× T – (tskew1 + tskew2 + tskew6)
time_k
tL
tL(max.) = (time_d + time_k–2)
× T – (tsu + tco + 2 × tbuf + 2 × tcable2)
time_d, time_k3
3 tk1 in the UDMA figures equals (tk –2 × T).
tn, tj
tkjn
tn= tj= tkjn = (max.(time_k,. time_jn)
× T – (tskew1 + tskew2 + tskew6)
time_jn
—ton
toff
ton = time_on
× T – tskew1
toff = time_off
× T – tskew1
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