vt82c586a ETC-unknow, vt82c586a Datasheet - Page 14

• Manufacturer Part Number: vt82c586a
• Description: Integrated Peripheral Controller
• Manufacturer: ETC-unknow

MSDT / IRQ12
A20M
KEYLOCK
TURBO
RTCX1 /
IRQ8#
RTCX2/
RTCCS#
VBAT
VEXT
MDRQ0
MDACK0
MIRQ[1:0]
XD[7:0]
XDIR
RTCAS/
PCWE0
ROMCS# /
KBCS#
PCWE1
EXTSMI#
APICCS#
Preliminary Revision 0.1 October 13, 1996

122-121, 119-
116, 114-113
88, 87
111
147
106
107
104
105
102
103
112
135
136
91
92
94
93
90
O
O
O
O
O
O
O
B
B
I
I
I
I
I
I
I
I
I
Multifunction Pin. Function depends on enable/disable of internal KBC.
A20 Mask. Direct connect A20 mask on CPU.
Keyboard Lock. Keyboard lock signal for internal keyboard controller.
Turbo. Turbo mode indicator input.
Multifunction Pin
Multifunction Pin
RTC Battery. Battery input for internal RTC
External Power
Plug and Play DMA Request. DMA request input from non-PNP device to support
the PnP function.
Plug and Play DMA Acknowledge. DMA acknowledge output from non-PNP
device to support the PnP function.
Plug and Play Interrupt Request. Interrupt request inputs from non-PNP device to
support the PnP function.
X-bus Data Bus. These pins are used as strap options during power-up:
X-Bus Data Direction. XDIR is tied directly to the direction control of a 74F245
transceiver that buffers the X-Bus data and ISA-Bus data (the output enable of the
transceiver should be grounded). SD0-7 connect to the “A” side of the transceiver
and XD0-7 connect to the “B” side. XDIR high indicates that SD0-7 drives XD0-7.
Multifunction Pin
Internal RTC disabled: Real Time Clock Address Strobe: RTCAS is connected
directly to the address strobe input of the external RTC.
Internal RTC enabled: General Purpose Write Enable 0: LATCH enable signal to
an external 373 for general purpose outputs (SD15-8).
Multifunction Pin. ROM Chip Select / Keyboard Controller Chip Select.
General Purpose Write Enable 1. LATCH enable signal to an external 373 for
general purpose outputs (SD15-8).
External SMI. External input to trigger SMI output to the CPU.
External IOAPIC Chip Select.
PS/2 mouse enabled: Mouse Data. Data to PS/2 mouse interface.
PS/2 mouse disabled: Interrupt Request 12. IRQ 12 input from external KBC
Internal RTC enabled: RTC Crystal Input: 32.768Khz crystal or oscillator input.
Internal RTC disabled: Interrupt Request 8: IRQ8 input from external KBC
Internal RTC enabled: RTC Crystal Output: 32.768Khz crystal output
Internal RTC disabled: External RTC Chip Select
XD0: 0/1 - Disable/enable internal KBC
XD1: 0/1 - Disable/enable internal PS/2 Mouse
XD2: 0/1 - Disable/enable internal RTC
XD3: 0/1 - PISA/SIO
XD4~XD7: RP13~RP16 for internal KBC
Normal Operation:
Power-up:
1: DACKn as DACKn
ISA memory cycle: ROMCS#. Chip Select to the BIOS ROM.
ISA I/O cycle: KBCS#. Chip Select to the external keyboard controller.
0: DACKn by external 137, DACK0 as DACEN, DACK1-3,5-7 as EXTSMI2-7
Internal Real Time Clock
On Board Plug and Play
Miscellaneous Control
XD Interface
-8-
VT82C586A
Pinouts