ARM ARM926EJ-S User's Guide download pdf (Page 263)

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101

Programmer’s Reference

4.25 UART

The PrimeCell UART is an AMBA compliant SoC peripheral that is developed, tested,

and licensed by ARM Limited. There are three UARTs in the ARM926EJ-S PXP

Development Chip and one UART is in FPGA. The 24MHz reference clock to the

UARTs come from the crystal oscillator that is part of OSC0.

The following key parameters are programmable:

• communication baud rate, integer, and fractional parts

• number of data and stop bits

• parity mode

• FIFO enable and FIFO trigger levels

• UART or IrDA protocol

• hardware flow control.

Table 4-73 UART implementation

Property Value

Location ARM926EJ-S PXP Development Chip for UART 0-2 FPGA

for UART3

Memory base address

0x101F1000

for UART0

0x101F2000

for UART1

0x101F3000

for

UART2

0x10009000

for UART3

Interrupt 12 on primary controller for UART0 13 on primary controller

for UART1 14 on primary controller for UART2 6 on secondary

controller for UART3

DMA 15 UART0 Tx 14 UART0 Rx 13 UART1 Tx 12 UART1 Rx 11

UART2 Tx 10 UART2 Rx

DMA channels for UART3 Tx and Rx are selectable as 0,1, or

2. See Direct Memory Access Controller and mapping registers

on page 4-52.

Release version ARM UART PL011 r1p3

Reference documentation ARM PrimeCell UART (PL011) Technical Reference Manual

(see also UART interface on page 3-88)

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