参数资料
型号: MC9328MX1DVM20
厂商: Freescale Semiconductor
文件页数: 73/100页
文件大小: 0K
描述: IC MCU I.MX 200MHZ 256-MAPBGA
标准包装: 152
系列: i.MX1
核心处理器: ARM9
芯体尺寸: 32-位
速度: 200MHz
连通性: EBI/EMI,I²C,MMC,智能卡,SPI,SSI,UART/USART,USB
外围设备: DMA,I²S,LCD,POR,PWM,WDT
输入/输出数: 110
程序存储器类型: ROMless
电压 - 电源 (Vcc/Vdd): 1.7 V ~ 3.3 V
振荡器型: 外部
工作温度: -30°C ~ 70°C
封装/外壳: 256-MAPBGA
包装: 托盘
Functional Description and Application Information
MC9328MX1 Technical Data, Rev. 7
74
Freescale Semiconductor
4.10.2
SDIO-IRQ and ReadWait Service Handling
In SDIO, there is a 1-bit or 4-bit interrupt response from the SDIO peripheral card. In 1-bit mode, the
interrupt response is simply that the SD_DAT[1] line is held low. The SD_DAT[1] line is not used as data
in this mode. The memory controller generates an interrupt according to this low and the system interrupt
continues until the source is removed (SD_DAT[1] returns to its high level).
In 4-bit mode, the interrupt is less simple. The interrupt triggers at a particular period called the “Interrupt
Period” during the data access, and the controller must sample SD_DAT[1] during this short period to
determine the IRQ status of the attached card. The interrupt period only happens at the boundary of each
block (512 bytes).
Figure 53. SDIO IRQ Timing Diagram
ReadWait is another feature in SDIO that allows the user to submit commands during the data transfer. In
this mode, the block temporarily pauses the data transfer operation counter and related status, yet keeps
the clock running, and allows the user to submit commands as normal. After all commands are submitted,
the user can switch back to the data transfer operation and all counter and status values are resumed as
access continues.
Command read cycle
NRC
8
Clock cycles
Command-command cycle
NCC
8
Clock cycles
Command write cycle
NWR
2
Clock cycles
Stop transmission cycle
NST
2
Clock cycles
TAAC: Data read access time -1 defined in CSD register bit[119:112]
NSAC: Data read access time -2 in CLK cycles (NSAC100) defined in CSD register bit[111:104]
Table 30. Timing Values for Figure 48 through Figure 52 (Continued)
Parameter
Symbol
Minimum
Maximum
Unit
Interrupt Period
IRQ
DAT[1]
For 4-bit
L H
Interrupt Period
DAT[1]
For 1-bit
CMD
Content
S T
E Z Z P
E Z Z
******
Z Z
Response
CRC
S
Z
E
S
Block Data
E
S
Block Data
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