LSI Logic Confidential
10-16
Host Async Master Interface
Copyright © 2001, 2002 by LSI Logic Corporation. All rights reserved.
Interrupt/GPIO Configuration Register
0x6F050
The operating modes, shown in
, are specified by the least
significant 3 bits of the 4-bit field.
The distinction between interrupt and input is based on whether the
interrupt is masked in the interrupt control register in the SPARC (some
GPIOs are not connected to the interrupt controller and never generate
interrupts). For edge-triggered interrupts, a rising or falling edge on the
associated interrupt pin will be converted to an internal level interrupt
request to the SPARCs. When interrupt acknowledge for that interrupt is
received from the SPARC (or after chip reset), the internal level interrupt
request will be reset. The next rising or falling edge after the level is reset
will cause a new interrupt to be generated.
The most significant bit of each 4-bit field is a write enable. Writes to the
Interrupt/GPIO configuration register will only update fields which have
the write-enable bit set to one. Any fields that have a 0 write enable bit
during register writes remain unchanged.
31
24 23
20 19
16 15
12 11
8
7
4
3
0
Reserved
GPIO[5]
Mode
GPIO[4]
Mode
GPIO[3]
Mode
GPIO[2]
Mode
GPIO[1]
Mode
GPIO[0]
Mode
Table 10.3
GPIO Pin Operating Modes
Value
Mode
0
Shared function mode (not interrupt or GPIO). The shared function is
defined in the pinout description (
and
). Pins that
do not have a shared function will act as inputs.
1
General Purpose Output
4
Negative edge triggered interrupt
5
Positive edge triggered interrupt
6
General purpose input: For pins 0 to 3, corresponding GPIO value bit
is complement of input. For pins 4 to 7, corresponding GPIO value bit
is same as input.
7
General purpose input or positive asserted level triggered interrupt
Содержание DMN-8600
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