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Cypress FM4 Series - Tuning Setting Register

Cypress FM4 Series
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CHAPTER 15: SD Card Interface
890 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
2.37 Tuning Setting Register
This register controls the settings for tuning.
D31 D28
D27 D24
D23 D17
D16
Rsvd
Data Timeout Counter Value
For Auto Re-Tuning
Rsvd
CMD Conflict Check
Disable
D15 D13
D12 D11
D10
D09
D08
D07 D00
Rsvd
Re-Tuning Range Select
Re-Tuning Tap Select
Tuning Error Border Select
Tuning Phase Select
Enable
Tuning Point Select
*: This Family does not support tuning or re-tuning.
Bit
Attribute
Description
31-28
Rsvd
Reserved
27-24
RW
Data Timeout Counter Value For Auto Re-Tuning
In Re-Tuning Mode 3, this field sets the data timeout counter value used in automatic
re-tuning (re-tuning by CMD19) triggered by a request trigger from SD_RT_REQ_I.
Details of this field are the same as those of Data Timeout Counter Value in the Timeout
Control Register.
Setting
TMCLK (SD_TOCLK_I)
0b1111
Reserved
0b1110
SD_CLK×227
0b1101
SD_CLK×226
...
0b0001
SD_CLK×214
0b0000
SD_CLK×213
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
0 Write

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