参数资料
型号: MC9328MXLVM20R2
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, LEAD FREE, MAPBGA-256
文件页数: 44/82页
文件大小: 1452K
代理商: MC9328MXLVM20R2
Specifications
MOTOROLA
MC9328MXL Advance Information
49
3.11.1 Command Response Timing on MMC/SD Bus
The card identification and card operation conditions timing are processed in open-drain mode. The card
response to the host command starts after exactly NID clock cycles. For the card address assignment,
SET_RCA is also processed in the open-drain mode. The minimum delay between the host command and
card response is NCR clock cycles as illustrated in Figure 39. The symbols for Figure 39 through Figure 43
are defined in Table 19.
Figure 39. Timing Diagrams at Identification Mode
After a card receives its RCA, it switches to data transfer mode. As shown on the first diagram in
Figure 40, SD_CMD lines in this mode are driven with push-pull drivers. The command is followed by a
period of two Z bits (allowing time for direction switching on the bus) and then by P bits pushed up by the
responding card. The other two diagrams show the separating periods NRC and NCC.
Table 19. State Signal Parameters for Figure 39 through Figure 43
Card Active
Host Active
Symbol
Definition
Symbol
Definition
Z
High impedance state
S
Start bit (0)
D
Data bits
T
Transmitter bit
(Host = 1, Card = 0)
*
Repetition
P
One-cycle pull-up (1)
CRC
Cyclic redundancy check bits (7 bits)
E
End bit (1)
SET_RCA Timing
Identification Timing
Host Command
CID/OCR
NID cycles
CMD
Content
S T
E Z
Z S T
Content
Z Z
******
CRC
Z
Host Command
CID/OCR
NCR cycles
CMD
Content
S T
E Z
Z S T
Content
Z Z
******
CRC
Z
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