BCM4354 Data Sheet
SDIO Timing
SDIO Bus Timing Specifications in SDR Modes
Clock Timing
Figure 39: SDIO Clock Timing (SDR Modes)
tCLK
SDIO_CLK
tCR
tCF
tCR
Table 53: 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,
CCARD = 10 pF
tCR, tCF < 0.96 ns (max.) @208 MHz,
CCARD = 10 pF
Clock duty
–
30
70
%
–
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 170
BROADCOM CONFIDENTIAL