BCM4339XKWBGT Datasheet, PDF (61/183 Pages) Cypress Semiconductor – Single-Chip 5G WiFi IEEE 802.11ac MAC/Baseband/Radio with Integrated Bluetooth 4.1 and FM Receiver

BCM4339 Preliminary Data Sheet
UART Interface
Desired Rate
4000000
3692000
3000000
2000000
1500000
1444444
921600
460800
230400
115200
57600
38400
28800
19200
14400
9600
UART_CTS_N
UART_TXD
UART_RXD
UART_RTS_N
Table 13: Example of Common Baud Rates
Actual Rate
4000000
3692308
3000000
2000000
1500000
1454544
923077
461538
230796
115385
57692
38400
28846
19200
14423
9600
Error (%)
0.00
0.01
0.00
0.00
0.00
0.70
0.16
0.16
0.17
0.16
0.16
0.00
0.16
0.00
0.16
0.00
Figure 18: UART Timing
1
2
Midpoint of STOP bit
Midpoint of STOP bit
3
Table 14: UART Timing Specifications
Ref No.
1
2
3
Characteristics
Delay time, UART_CTS_N low to UART_TXD valid
Setup time, UART_CTS_N high before midpoint of stop bit
Delay time, midpoint of stop bit to UART_RTS_N high
Min.
–
–
–
Typ.
–
–
–
Max.
1.5
0.5
0.5
Unit
Bit period
Bit period
Bit period
Broadcom^®
November 17, 2014 • 4339-DS106-R
Page 60