adsp-21478 Analog Devices, Inc., adsp-21478 Datasheet - Page 55

• Manufacturer Part Number: adsp-21478
• Description: Sharc Processor
• Manufacturer: Analog Devices, Inc.

Preliminary Technical Data
Universal Asynchronous Receiver-Transmitter
(UART) Port—Receive and Transmit Timing
Figure 41
The maximum baud rate is PCLK/16 where PCLK = 1/tPCLK.
As shown in
Table 46. Shift Register
1
Parameter
Timing Requirement
t
Switching Characteristic
t
UART signals RXD and TXD are routed through DPI P14-1 pins using the SRU.
RXD
TXD
1
1
describes UART port receive and transmit operations.
Figure 41
TRANSMIT
RECEIVE
Incoming Data Pulse Width
Outgoing Data Pulse Width
UART TRANSMIT
there is some latency between the gener-
UART RECEIVE
INTERRUPT
INTERRUPT
DPI_P14–1
INTERNAL
DPI_P14–1
INTERNAL
[RxD]
[TxD]
START
Figure 41. UART Port—Receive and Transmit Timing
Rev. PrB | Page 55 of 70 | March 2010
t
t
RXD
TXD
DATA (5–8)
DATA (5–8)
ation of internal UART interrupts and the external data
operations. These latencies are negligible at the data transmis-
sion rates for the UART.
STOP
STOP (1–2)
ADSP-21478/ADSP-21479
Min
16 × t
16 × t
UART TRANSMIT BIT SET BY PROGRAM;
UART RECEIVE BIT SET BY DATA STOP;
CLEARED BY WRITE TO TRANSMIT
PCLK
PCLK
CLEARED BY FIFO READ
–1
–1
Max
Unit
ns
ns