BCM89359 Advance Data Sheet
SDIO Timing
SDIO Bus Timing Specifications in SDR Modes
Clock Timing
Figure 35: SDIO Clock Timing (SDR Modes)
tCLK
SDIO_CLK
tCR
tCF
tCR
Table 51: SDIO Bus Clock Timing Parameters (SDR Modes)
Parameter
Symbol
Minimum
Maximum
Unit
Comments
–
t
40
20
10
4.8
–
–
–
–
–
ns
ns
ns
ns
ns
SDR12 mode
SDR25 mode
SDR50 mode
SDR104 mode
CLK
–
t
, t
0.2 × t
t
, t < 2.00 ns (max) @100 MHz,
CR CF
CLK
CR CF
C
= 10 pF
CARD
t
C
, t < 0.96 ns (max) @208 MHz,
CR CF
= 10 pF
CARD
Clock duty
–
30
70
%
–
Broadcom®
September 9, 2014 • 89359-DS100-R
Page 133
BROADCOM CONFIDENTIAL
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