BCM4330 Preliminary Data Sheet
UART Interface
UART_CTS_N
1
2
UART_TXD
Midpoint of STOP bit
Midpoint of STOP bit
UART_RXD
3
UART_RTS_N
Figure 18: UART Timing
Table 12: UART Timing Specifications
Ref No. Characteristics
Minimum Typical
Maximum Unit
1
2
Delay time, UART_CTS_N low to UART_TXD valid –
Setup time, UART_CTS_N high before midpoint of –
stop bit
–
–
1.5
0.5
Bit periods
Bit periods
3
Delay time, midpoint of stop bit to UART_RTS_N
high
–
–
0.5
Bit periods
®
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BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 62