MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 464

• Manufacturer Part Number: MCBSTM32EXL
• Description: BOARD EVALUATION FOR STM32F103ZE
• Manufacturer: Keil

Specifications of MCBSTM32EXL

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Secure digital input/output interface (SDIO)
Note:
464/995
Figure 187. SDIO command transfer
●
Table 121. Command format
The SDIO supports two response types. Both use CRC error checking:
●
●
If the response does not contain a CRC (CMD1 response), the device driver must ignore the
CRC failed status.
47
46
[45:40]
[39:8]
[7:1]
0
Command format
–
–
48 bit short response
136 bit long response
SDIO_CMD
Bit position
SDIO_CK
Command: a command is a token that starts an operation. Command are sent
from the host either to a single card (addressed command) or to all connected
cards (broadcast command are available for MMC V3.31 or previous). Commands
are transferred serially on the CMD line. All commands have a fixed length of 48
bits. The general format for a command token for MultiMediaCards, SD-Memory
cards and SDIO-Cards is shown in
extension of MMC commands V4.2, and so have the same format.
The command path operates in a half-duplex mode, so that commands and
responses can either be sent or received. If the CPSM is not in the Send state, the
SDIO_CMD output is in the Hi-Z state, as shown in
on SDIO_CMD are synchronous with the rising edge of SDIO_CK.
the command format.
Response: a response is a token that is sent from an addressed card (or
synchronously from all connected cards for MMC V3.31 or previous), to the host
as an answer to a previously received command. Responses are transferred
serially on the CMD line.
State
Idle
Hi-Z
1
1
6
32
7
1
Controller drives
Command
Width
Doc ID 13902 Rev 9
Send
Wait
Hi-Z
0
1
-
-
-
1
Table
Value
Response
121. CE-ATA commands are an
Receive
Card drives
Figure 187 on page
Start bit
Transmission bit
Command index
Argument
CRC7
End bit
Idle
Hi-Z
at least 8 SDIO_CK cycles
Controller drives
Description
Command
Send
Table
464. Data
RM0008
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