Cypress FM4 Series - Page 873

CHAPTER 15: SD Card Interface
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 873
Bit
Attribute
Description
24
HwInit
Voltage Support 3.3V
1: 3.3 V power supply is supported.
0: 3.3 V power supply is not supported.
23
HwInit
Suspend/Resume Support
The value of this bit is fixed at 1.
The Suspend/Resume function is supported.
22
HwInit
SDMA Support
1: SDMA is supported.
0: SDMA is not supported.
21
HwInit
High Speed Support
The value of this bit is fixed at 1.
The High Speed mode is supported.
20
Rsvd
Reserved
19
HwInit
ADMA2 Support
1: ADMA2 is supported.
0: ADMA2 is not supported.
18
HwInit
8-bit Support for Embedded Device
1: 8-bit bus width is supported.
0: 8-bit bus width is not supported.
17-16
HwInit
Max Block Length
This field indicates the maximum block size of data that can be transferred to the buffer of
the Host Controller.
0b00: 512 bytes
0b01: 1024 bytes
0b10: 2048 bytes
0b11: Reserved
15-08
R HwInit
Base Clock Frequency For SD Clock
This field indicates the base clock frequency.
The base clock frequency can be selected from 1 MHz to 255 MHz
Bit value
Value of Re-Tuning Timer
0xFF
255 MHz
...
...
0x02
2 MHz
0x01
1 MHz
0x00
Get information with another method
07
HwInit
Timeout Clock Unit
This bit indicates the unit of clock frequency for detecting the Data Timeout Error.
0: kHz
1: MHz
06
Rsvd
Reserved
05-00
HwInit
Timeout Clock Frequency
This bit indicates the clock frequency for detecting the Data Timeout Error.
Not 0: 1 kHz to 63 kHz or 1 MHz to 63 MHz
"000000": Get information with another method