Cypress FM4 Series - Page 892

CHAPTER 15: SD Card Interface
892 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Bit
Attribute
Description
10
RW
Re-Tuning Tap Select
This bit selects the number of phases to be processed in re-tuning.
0: 8 phases is processed in re-tuning.
1: 3 phases (current phase and two adjacent phases) is processed in re-tuning.
This bit can be set to 1 only when 3 or more bits of the 8 Phase Tuning/Re-Tuning
Result bits in the Tuning Status Register are 1.
Set this bit according to the setting of the Re-Tuning Mode bit as shown below.
Re-Tuning Mode 1: 0 or 1
Re-Tuning Mode 2: 0
Re-Tuning Mode 3: 0
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
Writing 0 to the Sampling Clock Select bit in the Host
Control 2 Register
0 Write
09
RW
Tuning Border Error Select
This bit sets the border for tuning fail in tuning/re-tuning (8 phases).
0: If the SD card interface has properly received from the SD card 3 phases or more of
test pattern, it considers that tuning is successful.
1: If the SD card interface has properly received from the SD card 1 phase or more of
test pattern, it considers that tuning is successful.
If the Re-Tuning Tap Select bit is set to 1, the setting of this bit becomes invalid.
Regardless of the setting of this bit, if the SD card interface has properly received from
the SD card 2 phases or more of test pattern, it considers that tuning is successful.
Set this bit according to the setting of the Re-Tuning Mode bit as shown below.
Re-Tuning Mode 1: 0 or 1
Re-Tuning Mode 2: 0
Re-Tuning Mode 3: 0
Set/Reset
Condition
Set
1 Write
Reset (0)
System reset
Software Reset For All
Writing 0 to the Sampling Clock Select bit in the Host
Control 2 Register
0 Write