AMD-766 Datasheet, PDF (9/96 Pages) Advanced Micro Devices – Peripheral Bus Controller

23167B – March 2001
Preliminary Information
AMD-766^TM Peripheral Bus Controller Data Sheet
3.4 ISA/LPC Bus and Legacy Support Signals
Pin name and description
BCLK. ISA bus clock. This is the approximately 8 MHz ISA-bus clock.
It is the frequency of PCLK divided by four.
EKIRQ1. External keyboard controller IRQ1. This is designed to be
connected to the keyboard controller’s IRQ1 for the internal interrupt
controller logic.
EKIRQ12. External keyboard controller IRQ12 mouse interrupt. This is
designed to be connected to the keyboard controller’s IRQ12 for the
internal interrupt controller logic. See C3A46[10:9] for information on
how the IRQ12 pin and the mouse interrupt are combined.
IOCHK#. ISA bus IO channel check signal. The assertion of this signal
controls PORT61[IOCHK].
IOCHRDY. ISA bus IO channel ready signal. This is deasserted by ISA
bus slaves to extend the duration of the cycle.
IOR#. ISA bus IO read signal.
IOW#. ISA bus IO write signal.
IRQ[11:9,7:3]. ISA bus interrupt request signals.
REQ[7:0]#. PCI bus master request pins (alternate function to IRQ[11:9,
7:3]; selected by PMF5). These pins may be used to set PM00[BM_STS].
IRQ12. ISA bus interrupt request 12.
IO cell
type
Output
Input
Input
Input-
PU
Input-
PU
Output
Output
Input-
PU
Input
Power
plane
VDD3
VDD3
VDD3
VDD3
VDD3
VDD3
VDD3
VDD3
VDD3
During Post
Reset Reset
Func. Func.
Input Input
Input Input
-
-
3-state 3-state
High High
High High
-
-
-
-
POS
Func.
Func.
Func.
-
3-state
High
High
-
-
SMBALERT#. SMBus alert (alternate function to IRQ12; selected by
C3A46[10:9]). When enabled to do so, this may be used to generate an
SMI or SCI interrupt associated with the SMBus logic.
USBOC1#. USB over current detect 1 (alternate function to IRQ12;
selected by C3A46[10:9]). When enabled to do so, this may be routed to
the USB block to be a second source of USB port over-current detection.
IRQ[15,14]. Input; ISA bus interrupt request signals.
Input- VDD3 -
-
-
PU
NMPIRQ. Native mode primary IDE port IRQ (alternate function to
IRQ14; selected by C1A08[8]). When C1A08[8] is high, this pin becomes
an active-high, shared interrupt that is logically combined with PIRQA#
such that it may be shared with other PCI devices. This is in support of
native mode as defined by the PCI IDE Controller Specification.
NMSIRQ. Native mode secondary IDE port IRQ (alternate function to
IRQ15; selected by C1A08[10]). When C1A08[10] is high, this pin
becomes an active-high, shared interrupt that is logically combined with
PIRQA# such that it may be shared with other PCI devices. This is in
support of native mode as defined by the PCI IDE Controller
Specification.
ISABIOS. Direct BIOS accesses to the ISA bus versus the LPC bus. The
state of this pin may be accessed in C3A48[ISABIOS]. 1=The ISA bus.
0=The LPC bus.
KA20G. Keyboard A20 gate. This is designed to be the gate A20 signal
from the system keyboard controller. It affects A20M#.
KBRC#. Keyboard reset command. This is designed to be the processor
Input VDD3 Input
Input VDD3 Input
Input VDD3 Input
Input
Input
Input
Input
Func.
Func.
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