SAM3SD8B Atmel Corporation, SAM3SD8B Datasheet - Page 852

• Manufacturer Part Number: SAM3SD8B
• Manufacturer: Atmel Corporation

34.14.7
Name:
Address:
Access:
• BCNT: 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 Com-
mand Register (HSMCI_CMDR):
Warning: In SDIO Byte and Block modes, writing to the 7 last bits of BCNT field is forbidden and may lead to unpredictable
results.
• BLKLEN: Data Block Length
This field determines the size of the data block.
This field is also accessible in the HSMCI Mode Register (HSMCI_MR).
Bits 16 and 17 must be set to 0 if FBYTE is disabled.
Note:
852
852
Value
31
23
15
0
4
5
7
In SDIO Byte mode, BLKLEN field is not used.
SAM3S8/SD8
SAM3S8/SD8
HSMCI Block Register
MULTIPLE
BYTE
BLOCK
30
22
14
HSMCI_BLKR
0x40000018
Read-write
6
Name
29
21
13
5
Description
MMC/SDCARD Multiple Block
From 1 to 65635: Value 0 corresponds to an infinite block transfer.
SDIO Byte
From 1 to 512 bytes: Value 0 corresponds to a 512-byte transfer.
Values from 0x200 to 0xFFFF are forbidden.
SDIO Block
From 1 to 511 blocks: Value 0 corresponds to an infinite block transfer.
Values from 0x200 to 0xFFFF are forbidden.
28
20
12
4
BLKLEN
BLKLEN
BCNT
BCNT
27
19
11
3
26
18
10
2
25
17
9
1
11090A–ATARM–10-Feb-12
11090A–ATARM–10-Feb-12
24
16
8
0