RS_SDIO controller
RM0082
726/844
Doc ID 018672 Rev 1
[23]
SUSRESSUP
P
1’h1
Hwinit
This bit indicates whether the HC supports
Suspend / Resume functionality. If this bit is logic
‘0’, the Suspend and Resume mechanism are not
supported and the HD shall not issue either
Suspend / Resume commands.
1’b0 - Not Supported
1’b1 - Supported
[22]
SDMASUPP
1’h1
Hwinit
This bit indicates whether the HC is capable of
using DMA to transfer data between system
memory and the HC directly.
1’b0 - SDMA Not Supported
1’b1 - SDMA Supported.
[21]
HSSUPP
1’h1
Hwinit
This bit indicates whether the HC and the Host
System support High Speed mode and they can
supply SD Clock frequency from 25 MHz to 50
MHz.
1’b0 - High Speed Not Supported
1’b1 - High Speed Supported
[20]
-
-
Rsvd
Reserved
[19]
ADMA2SUPP
1’h1
Hwinit
1’b1 - ADMA2 support.
1’b0 - ADMA2 not support
[18]
EXTMDBSUP
P
1’h1
Hwinit
This bit indicates whether the Host Controller is
capable bus.
1’b1 - Extended Media Bus Supported
1’b0 - Extended Media Bus not Supported
[17:16]
MAXBLKLEN
2’h3
Hwinit
This value indicates the maximum block size that
the HD can read and write to the buffer in the HC.
The buffer shall transfer this block size without wait
cycles. Three sizes can be defined as indicated
below.
2’b00 - 512 byte
2’b01 - 1024 byte
2’b10 - 2048 byte
2’b11 - 4096 byte
[15:14]
-
-
Rsvd
Reserved
Table 647.
CAP1 register bit assignments (continued)
Bit
Name
Reset
value
Type
Description