参数资料
型号: MC9328MX1DVM20R2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 200 MHz, RISC PROCESSOR, PBGA256
封装: 14 X 14 MM, 1.30 MM HEIGHT, 0.80 MM PITCH, MAPBGA-256
文件页数: 64/94页
文件大小: 1487K
代理商: MC9328MX1DVM20R2
Specifications
MOTOROLA
MC9328MX1 Advance Information
67
3.14.2 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.
Table 31. Timing Values for Figure 48 through Figure 52
Parameter
Symbol
Minimum
Maximum
Unit
MMC/SD bus clock, CLK (All values are referred to minimum (VIH) and maximum (VIL)
Command response cycle
NCR
2
64
Clock cycles
Identification response cycle
NID
5
Clock cycles
Access time delay cycle
NAC
2
TAAC + NSAC
Clock cycles
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]
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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