LSI Logic Confidential
SIO Register Descriptions
15-85
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
UART1 / UART2 Divisor Latch MSB Register (DLM)
Offset = 0xBE0104 / 0xBE0184
Read/Write
Default = 0x0000 0000
DMSB
Divisor MSB
31:24
The baud rate generator implements two 8-bit latches,
called divisor latches, that can be accessed by the host
processor for read/write. The host processor can load 16-
bit data in these divisor latches to obtain 16*baud fre-
quency output from the baud rate generator. This block
implements a 16-bit counter, together with the DLL, to
generate the NBDOUT from the input clock.
UART1 Interrupt Identification / FIFO Control Register (UART1_IIR_FCR)
UART2 Interrupt Identification / FIFO Control Register (UART2_IIR_FCR)
In effect, two registers share the offset address 0x108: UART1_IIR, and
UART1_FCR.
Similarly, two registers share the offset address 0x188: UART2_IIR, and
UART2_FCR.
The read or write operation determines which register is accessed:
•
UART*_IIR is read-only; that is, reading this address returns the
contents of UART*_IIR.
•
UART*_FCR is write-only; that is, writing to this address changes the
contents of UART*_FCR.
In either case, each of these two registers is always accessed via the
same software name, UART1_IIR_FCR or UART2_IIR_FCR.
31
24
23
16
DMSB
RSVD
15
0
RSVD
Содержание DMN-8600
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