BCM88335 Data Sheet
SDIO/gSPI Timing
SDIO Bus Timing Specifications in SDR Modes
Clock Timing
Figure 36: SDIO Clock Timing (SDR Modes)
tCLK
SDIO_CLK
tCR
tCF
tCR
Table 46: SDIO Bus Clock Timing Parameters (SDR Modes)
Parameter
Symbol
Minimum
Maximum
Unit
Comments
–
tCLK
40
20
10
4.8
–
–
ns
ns
ns
ns
ns
SDR12 mode
SDR25 mode
SDR50 mode
SDR104 mode
–
–
–
–
t
CR, tCF
0.2 × tCLK
tCR, tCF < 2.00 ns (max.) @100 MHz,
CARD = 10 pF
tCR, tCF < 0.96 ns (max.) @208 MHz,
C
CCARD = 10 pF
Clock duty
cycle
–
30
70
%
–
Broadcom®
September 23, 2015 • 88335-DS100-R
Page 124
BROADCOM CONFIDENTIAL
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