LSI Logic Confidential
AC Timing
18-31
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
18.2.8 UART Interface Timing
UART is an asynchronous, two-wire protocol: one for transmitting data,
and one for receiving data.
shows timing parameters for the
UART interface.
lists timing values for UART parameters.
Figure 18.25 UART Interface AC Timing
T1
Driving edge SCLK to FSYNC/data output delay
−
10
10
ns
T2
FSYNC/data input to sampling edge SCLK setup
10
ns
T3
FSYNC/data input to sampling edge SCLK hold
10
ns
T4
2
SCLK period (Absolute)
40
3
ns
T4
2
SCLK period (Relative):
- Less than four data pins active, IEC958 active,
R958=0, and OTim =0
- Four data pins active
- Less than four data pins active
6 cycles
9 cycles
5 cycles
ns
1. “Cycles” refers to internal system clock cycles.
2. Four data pins are active if ChCnt=3, or FrForm=1, or (FrForm=0 && ChCnt=4). See Audio Output
Control register and Audio Input Control register for bit descriptions.
3. The minimum SCLK period is the greater of the absolute or relative minimum period
Table 18.19 Audio Input/Output AC Timing Parameters
Symbol
Description
Min
1
Typ
Max
Unit
SIO_UART_TX (O)
SIO_UART_RX (I)
SIO_UART_RTS (O)
SIO_UART_CTS (I)
T
1
T
2
T
3
T
4
Содержание DMN-8600
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