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Document Number: 002-14949 Rev. *G
Page 41 of 113
PRELIMINARY
CYW43353
9. WLAN Host Interfaces
9.1 SDIO v3.0
The CYW43353 WLAN section supports SDIO version 3.0, including the new UHS-I modes:
■
DS: Default speed (DS) up to 25 MHz, including 1- and 4-bit modes (3.3V signaling).
■
HS: High speed up to 50 MHz (3.3V signaling).
■
SDR12: SDR up to 25 MHz (1.8V signaling).
■
SDR25: SDR up to 50 MHz (1.8V signaling).
■
SDR50: SDR up to 100 MHz (1.8V signaling).
■
SDR104: SDR up to 208 MHz (1.8V signaling).
■
DDR50: DDR up to 50 MHz (1.8V signaling).
Note:
The CYW43353 is backward compatible with SDIO v2.0 host interfaces.
The SDIO interface also has the ability to map the interrupt signal on to a GPIO pin for applications requiring an interrupt different
from the one provided by the SDIO interface. The ability to force control of the gated clocks from within the device is also provided.
SDIO mode is enabled by strapping options. Refer to
WLAN GPIO Functions and Strapping Options.
The following three functions are supported:
■
Function 0 Standard SDIO function (Max. BlockSize/ByteCount = 32B)
■
Function 1 Backplane Function to access the internal system-on-chip (SoC) address space
(Max. BlockSize/ByteCount = 64B)
■
Function 2 WLAN Function for efficient WLAN packet transfer through DMA
(Max. BlockSize/ByteCount = 512B)
9.1.1 SDIO Pins
Table 12. SDIO Pin Description
Figure 17. Signal Connections to SDIO Host (SD 4-Bit Mode)
SD 4-Bit Mode
SD 1-Bit Mode
gSPI Mode
DATA0
Data line 0
DATA
Data line
DO
Data output
DATA1
Data line 1 or Interrupt
IRQ
Interrupt
IRQ
Interrupt
DATA2
Data line 2 or Read Wait
RW
Read Wait
NC
Not used
DATA3
Data line 3
N/C
Not used
CS
Card select
CLK
Clock
CLK
Clock
SCLK
Clock
CMD
Command line
CMD
Command line
DI
Data input
SD Host
CYW43353
CLK
CMD
DAT[3:0]