MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 499

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

Specifications of MCBSTM32EXL

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

RM0008
20.9.4
Note:
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
1
2
Bits 31:15
Bits 7:6 WAITRESP: Wait for response bits
Bit 5:0 CMDINDEX: Command index
SDIO command register (SDIO_CMD)
Address offset: 0x0C
Reset value: 0x0000 0000
The SDIO_CMD register contains the command index and command type bits. The
command index is sent to a card as part of a command message. The command type bits
control the command path state machine (CPSM).
After a data write, data cannot be written to this register for seven HCLK clock periods.
MultiMediaCards can send two kinds of response: short responses, 48 bits long, or long
responses,136 bits long. SD card and SD I/O card can send only short responses, the
Bit 14 ATACMD: CE-ATA command
Bit 13 nIEN: not Interrupt Enable
Bit 12 ENCMDcompl: Enable CMD completion
Bit 11 SDIOSuspend: SD I/O suspend command
Bit 10 CPSMEN: Command path state machine (CPSM) Enable bit
Bit 9 WAITPEND: CPSM Waits for ends of data transfer (CmdPend internal signal).
Bit 8 WAITINT: CPSM waits for interrupt request
If this bit is set, the CPSM waits for the end of data transfer before it starts sending a
command.
The command index is sent to the card as part of a command message.
Reserved, always read as 0.
If ATACMD is set, the CPSM transfers CMD61.
if this bit is 0, interrupts in the CE-ATA device are enabled.
If this bit is set, the command completion signal is enabled.
If this bit is set, the command to be sent is a suspend command (to be used only with SDIO
card).
If this bit is set, the CPSM is enabled.
If this bit is set, the CPSM disables command timeout and waits for an interrupt request.
They are used to configure whether the CPSM is to wait for a response, and if yes, which
kind of response.
00: No response, expect CMDSENT flag
01: Short response, expect CMDREND or CCRCFAIL flag
10: No response, expect CMDSENT flag
11: Long response, expect CMDREND or CCRCFAIL flag
Reserved
Doc ID 13902 Rev 9
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Secure digital input/output interface (SDIO)
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