参数资料
型号: MCIMX258CJM4
厂商: Freescale Semiconductor
文件页数: 96/153页
文件大小: 0K
描述: MPU IMX25 IND 400-MAPBGA
特色产品: MCIMX25 Applications Processors
标准包装: 90
系列: i.MX25
核心处理器: ARM9
芯体尺寸: 32-位
速度: 400MHz
连通性: 1 线,CAN,EBI/EMI,以太网,I²C,MMC,智能卡,SPI,SSI,UART/USART,USB OTG
外围设备: DMA,I²S,LCD,POR,PWM,WDT
输入/输出数: 128
程序存储器类型: 外部程序存储器
RAM 容量: 144K x 8
电压 - 电源 (Vcc/Vdd): 1.15 V ~ 1.52 V
数据转换器: A/D 3x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 400-LFBGA
包装: 托盘
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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