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RM0008
Table 132. AU_SIZE field
Secure digital input/output interface (SDIO)
09h
Ah – Fh
AU_SIZE
4 MB
Reserved
Value definition
The maximum AU size, which depends on the card capacity, is defined in Table 133 . The
card can be set to any AU size between RU size and maximum AU size.
Table 133. Maximum AU size
Capacity
Maximum AU Size
16 MB-64 MB
512 KB
128 MB-256 MB
1 MB
512 MB
2 MB
1 GB-32 GB
4 MB
ERASE_SIZE
This 16-bit field indicates N ERASE . When N ERASE 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 134. Erase size field
ERASE_SIZE
0000h
0001h
0002h
0003h
---------
FFFFh
Value definition
Erase timeout calculation is not supported.
1 AU
2 AU
3 AU
---------
65535 AU
ERASE_TIMEOUT
This 6-bit field indicates T ERASE and the value indicates the erase timeout from offset when
multiple AUs are being erased as specified by ERASE_SIZE. The range of
ERASE_TIMEOUT can be defined as up to 63 seconds and the card manufacturer can
choose any combination of ERASE_SIZE and ERASE_TIMEOUT depending on the
implementation. Determining ERASE_TIMEOUT determines the ERASE_SIZE.
Table 135. Erase timeout field
00
01
02
03
ERASE_TIMEOUT
Value definition
Erase timeout calculation is not supported.
1 [sec]
2 [sec]
3 [sec]
Doc ID 13902 Rev 9
485/995
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