RS_SDIO controller
RM0082
682/844
Doc ID 018672 Rev 1
SDCD_n
IN
Active Low. Card Detection for single slot
SDWP
IN
Active High. SD card write protect
led_on
OUT
LED ON : Tp caution the user not to remove the card while the
SD card is being accessed
Table 613.
System Interface
Signal
DIR
Description
clk_xin
IN
This SD clock input is used to generate SD Clock. This clock is
also used to derive Sleep clk which is used to detect Card
insertion / removal and card interrupt. For maximum efficiency
this should be around 52Mhz.
clk_sleep_in
IN
Input Sleep Clock used to detect Card Insertion / removal and
card interrupt.
clk_sleep_out
OUT
Output Sleep Clock - Internally generated Sleep Clock from
clk_xin.
To use External Sleep Clock for Card Detection: Connect the
External Sleep Clock to clk_sleep_in Input. To use Internally
generated Sleep Clock for Card
Detection: At the top, connect both clk_sleep_in &
clk_sleep_out together.
rstahb_n
IN
External reset
clk_sdram
OUT
clk to RAM in sd clock domain
test mode
IN
test mode signal
Table 614.
RAM Interface signals
Signal
DIR
Description
AA_RAM1[7:0]
OUT
Address for PORT A FIFO 1
DA_RAM1[31:0]
OUT
Data in for PORT A FIFO 1
CENA_RAM1
OUT
Chip enable for PORT A FIFO 1
WENA_RAM1
OUT
Write enable for PORT A FIFO 1
AB_RAM1[7:0]
OUT
Address for PORT B FIFO 1
DB_RAM1[31:0]
OUT
Data in for PORT B FIFO 1
CENA_RAM1
OUT
Chip enable for PORT B FIFO 1
WENB_RAM1
OUT
Write enable for PORT B FIFO 1
AA_RAM2[7:0]
OUT
Address for PORT A FIFO 2
DA_RAM2[31:0]
OUT
Data in for PORT A FIFO 2
CENA_RAM2
OUT
Chip enable for PORT A FIFO 2
WENA_RAM2
OUT
Write enable for PORT A FIFO 2
AB_RAM2[7:0]
OUT
Address for PORT B FIFO 2
Table 612.
SD2.0/SDIO2.0/MMC4.2 card interface (continued)
Signal
DIR
Description