Secure digital input/output interface (SDIO) RM0090
1048/1749 RM0090 Rev 18
AU_SIZE
This 4-bit field indicates the AU size and the value can be selected in the power of 2 base
from 16 KB.
The maximum AU size, which depends on the card capacity, is defined in Table 163. The
card can be set to any AU size between RU size and maximum AU size.
ERASE_SIZE
This 16-bit field indicates NERASE. When NERASE numbers of AUs are erased, the
timeout value is specified by ERASE_TIMEOUT (Refer to ERASE_TIMEOUT). The host
should determine the proper number of AUs to be erased in one operation so that the host
can show the progress of the erase operation. If this field is set to 0, the erase timeout
calculation is not supported.
Table 162. AU_SIZE field
AU_SIZE Value definition
00h Not defined
01h 16 KB
02h 32 KB
03h 64 KB
04h 128 KB
05h 256 KB
06h 512 KB
07h 1 MB
08h 2 MB
09h 4 MB
Ah – Fh Reserved
Table 163. Maximum AU size
Capacity 16 MB-64 MB 128 MB-256 MB 512 MB 1 GB-32 GB
Maximum AU Size 512 KB 1 MB 2 MB 4 MB
Table 164. Erase size field
ERASE_SIZE Value definition
0000h Erase timeout calculation is not supported.
0001h 1 AU
0002h 2 AU
0003h 3 AU
--------- ---------
FFFFh 65535 AU
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