BCM43455 Preliminary Data Sheet
JTAG Timing
JTAG Timing
Table 62: JTAG Timing Characteristics
Output
Maximum
Output
Minimum
Signal Name
Period
Setup
Hold
TCK
125 ns
–
–
–
–
TDI
–
–
–
20 ns
20 ns
–
0 ns
0 ns
–
TMS
–
–
–
TDO
–
100 ns
–
0 ns
–
JTAG_TRST
250 ns
–
–
SWD Timing
The probe outputs data to SWDIO on the falling edge of SWDCLK and captures data from SWDIO on the rising
edge of SWDCLK. The target outputs data to SWDIO on the rising edge of SWDCLK and captures data from
SWDIO on the rising edge of SWDCLK. SWD timing is defined through the combination of Figure 43 and
Table 63.
Figure 43: SWD Read and Write Timing
Read Cycle
RVI probe output to SWDIO
Thigh Tlow
Stop
Park
TOS
Tri-State
Data
Data
Parity Start
RVI probe output to SWDCLK
Target output to SWDIO
Tri-State
Acknowledge
Tri-State
Write Cycle
RVI probe output to SWDIO
Stop
Park
Tri-State
Tih
Start
Tis
RVI probe output to SWDCLK
Target output to SWDIO
Tri-State
Acknowledge
Data
Data
Parity
Tri-State
Table 63: SWD Read and Write Timing Parameters
Parameter Description
Min. Max. Units
Tcyc
Thigh
Tlow
Tos
SWDCLK cycle time
SWDCLK high period
125
50
–
–
–
5
ns
ns
ns
ns
SWDCLK low period
50
SWDIO output skew to the falling edge of SWDCLK
–5
Tis
Tih
Input setup time between SWDIO and the rising edge of SWDCLK
Input hold time between SWDIO and the rising edge of SWDCLK
20
0
–
ns
100 ns
Broadcom®
November 5, 2015 • 43455-DS109-R
Page 150
BROADCOM CONFIDENTIAL
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