BCM43907 Preliminary Data Sheet
SDIO Interface Timing
SDIO Bus Timing Specifications in SDR Modes
Clock Timing
SDIO clock timing in the SDR modes is shown by the combination of Figure 26 and Table 47.
Figure 26: SDIO Clock Timing (SDR Modes)
tCLK
SDIO_CLK
tCR
tCF
tCR
Table 47: SDIO Bus Clock Timing Parameters (SDR Modes)
Parameter
Symbol
Minimum
Maximum
Unit
Comments
–
t
40
20
–
–
–
ns
ns
ns
SDR12 mode
SDR25 mode
CLK
–
t
, t
0.2 × t
70
C
–
= 10 pF
CARD
CR CF
CLK
Clock duty
cycle
–
30
%
Broadcom®
March 12, 2016 • 43907-DS104-R
Page 107
BROADCOM CONFIDENTIAL