LSI Logic Confidential
SIO Register Descriptions
15-95
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
UART1 Hardware Flow Control Register (UART1_HW_FLOW_CTRL)
UART2 Hardware Flow Control Register (UART2_HW_FLOW_CTRL)
Offset = 0xBE0124 / 0xBE01A4
Read/Write
Default = 0x0000 0000
HWFL
Hardware Flow Control
24
1 = The UART enables hardware flow control. Under
hardware flow control, the UART transmit and receive
operations operate as follows:
•
TX = The input CTS strobe is used as an output
enable for a data byte (if CTS is high, then do not
send data out on the pins). Race conditions result in
data going out.
•
RX = The output RTS strobe is deasserted if the
receive FIFO is at a level of 2 bytes from full, and is
reasserted when it is 3 bytes from full. The software-
programmed value in the Modem Control Register is
ignored, and the register bit reflects the output on the
SIO_UART*_RTS pin.
0 = Hardware flow control is disabled, and the UART
operation is normal.
UART1 DMA Transmit Control Register (UART1_TX_CONTROL_REG_ADDR)
UART2 DMA Transmit Control Register (UART2_TX_CONTROL_REG_ADDR)
Offset = 0xBE0140 / 0xBE01C0
Read/Write
Default = 0x0000 0000
31
25
24
23
16
RSVD
HWFL
RSVD
15
0
RSVD
31
16
RSVD
15
4
3
2
1
0
RSVD
GO
MODE
FLUS
CHEN