BCM89359 Advance Data Sheet
SDIO Timing
SDIO Bus Timing Specifications in DDR50 Mode
Figure 40: SDIO Clock Timing (DDR50 Mode)
tCLK
SDIO_CLK
tCR
tCF
tCR
Table 55: SDIO Bus Clock Timing Parameters (DDR50 Mode)
Parameter
Symbol
Minimum
Maximum
Unit
Comments
–
–
t
t
20
–
–
ns
ns
DDR50 mode
CLK
,t
0.2 × tCLK
t
, t < 4.00 ns (max) @50 MHz,
CR CF
CR CF
C
= 10 pF
CARD
Clock duty
–
45
55
%
–
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 137
BROADCOM CONFIDENTIAL