HSMCI_BLKR

HSMCI Block Register

  0x18 32 Read/Write 0x0  
Parent topic: Register Summary

HSMCI Block Register

Bit  31 30 29 28 27 26 25 24  
  BLKLEN[15:8]  
Access                   
Reset  0 0 0 0 0 0 0 0  
Bit  23 22 21 20 19 18 17 16  
  BLKLEN[7:0]  
Access                   
Reset  0 0 0 0 0 0 0 0  
Bit  15 14 13 12 11 10 9 8  
  BCNT[15:8]  
Access                   
Reset  0 0 0 0 0 0 0 0  
Bit  7 6 5 4 3 2 1 0  
  BCNT[7:0]  
Access                   
Reset  0 0 0 0 0 0 0 0  

Bits 15:0 – BCNT[15:0]: MMC/SDIO Block Count - SDIO Byte Count

MMC/SDIO Block Count - SDIO Byte Count

This field determines the number of data byte(s) or block(s) to transfer.

The transfer data type and the authorized values for BCNT field are determined by the TRTYP field in the HSMCI Command Register (HSMCI_CMDR).

When TRTYP = 1 (MMC/SDCARD Multiple Block), BCNT can be programmed from 1 to 65535, 0 corresponds to an infinite block transfer.

When TRTYP = 4 (SDIO Byte), BCNT can be programmed from 1 to 511, 0 corresponds to 512-byte transfer. Values in range 512 to 65536 are forbidden.

When TRTYP = 5 (SDIO Block), BCNT can be programmed from 1 to 511, 0 corresponds to an infinite block transfer. Values in range 512 to 65536 are forbidden.

Warning: In SDIO Byte and Block modes (TRTYP = 4 or 5), writing the 7 last bits of BCNT field with a value which differs from 0 is forbidden and may lead to unpredictable results.

Bits 31:16 – BLKLEN[15:0]: Data Block Length

Data Block Length

This field determines the size of the data block.

Bits 16 and 17 must be configured to 0 if FBYTE is disabled.

Note: In SDIO Byte mode, BLKLEN field is not used.