Table 232. Au_Size Field; Table 233. Maximum Au Size - ST STM32L4x6 Reference Manual

RM0351
PERFORMANCE_MOVE
02h
---------
FEh
FFh
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.
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
Ah – Fh
The maximum AU size, which depends on the card capacity, is defined in
card can be set to any AU size between RU size and maximum AU size.
Capacity
Maximum AU Size
ERASE_SIZE
This 16-bit field indicates N
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 231. Performance move field (continued)

Table 232. AU_SIZE field

AU_SIZE

Table 233. Maximum AU size

16 MB-64 MB
512 KB
. When N
ERASE
DocID024597 Rev 3
SD/SDIO/MMC card host interface (SDMMC)
Value definition
02h 2 [MB/sec]
---------
254 [MB/sec]
Infinity
Value definition
Not defined
16 KB
32 KB
64 KB
128 KB
256 KB
512 KB
1 MB
2 MB
4 MB
Reserved
128 MB-256 MB
1 MB
numbers of AUs are erased, the timeout
ERASE
Table 233. The
512 MB 1 GB-32 GB
2 MB 4 MB
1423/1693
1450