VT8231 datasheet(27/132 Pages) ETC

27 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-21-

Pinouts

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Conventional BIOS ROM / ISA Bus Interface

Signal Name

Pin #

I/O

Signal Description

LA21 / USBOC3# / GPO21

LA20 / USBOC2# / GPO20

Y13

W13

System Address Bus. Allows access to physical memory

devices (e.g., BIOS ROMs) up to 4 Mbytes.

SA[19:18],

SA17 / strap,

SA16 / strap,

SA[15:0] / SDD[15:0]

V13, U13,

T13,

Y14,

W18, V17, Y17, W16,

V15, Y15, W14, T15,

U15, U16, V14, W15,

Y16, V16, W17, Y18

System Address Bus.

These address lines are used to

interface to BIOS ROMs but may also be used to

implement a subset of the ISA bus if required. SA[19-16]

are connected to ISA bus SA[19-16] directly. SA[19-17]

are also connected to LA[19-17] of the ISA bus.

SD15 / LGNT2# / GPO11,

SD14 / LREQ2# / GPI13,

SD13 / LGNT1# / GPO10,

SD12 / LREQ1# / GPI12,

SD11 / HGNT2# / GPO9,

SD10 / HREQ2# / GPI11,

SD9 / HGNT1# / GPO8,

SD8 / HREQ1# / GPI10,

SD7,

SD6,

SD5,

SD4,

SD3,

SD2,

SD1,

SD0

V10

W10

Y10

U10

T10

V11

W11

Y11

T11

R11

U11

U12

Y12

W12

V12

R12

IO / O / O

IO / I / I

IO / O / O

IO / I / I

IO / O / O

IO / I / I

IO / O / O

IO / I / I

System Data. SD[15:0] provide the data path for BIOS

ROMs and for devices residing on the ISA bus. SD0-7

also output general purpose output information when

GPOWE# is active.

IOR# / GPO22

I/O Read.

IOR# is the command to an ISA I/O slave

device that the slave may drive data on to the ISA data bus.

IOW# / GPO23

I/O Write. IOW# is the command to an ISA I/O slave

device that the slave may latch data from the ISA data bus.

MEMR#

Memory Read. MEMR# is the command to a memory

slave that it may drive data onto the ISA data bus.

MEMW#

Memory Write. MEMW# is the command to a memory

slave that it may latch data from the ISA data bus.

IRQ1 / MSCK

I / IO

Interrupt 1 (optional external Keyboard Controller).

IRQ8# / GPI1

I / I

Interrupt 8 (optional external RTC).

IRQ12 / MSDT

I / IO

Interrupt 12 (optional external PS2 Mouse Controller).

IRQ14

T14

Interrupt 14 (IDE Primary Channel).

IRQ15

U14

Interrupt 15 (IDE Secondary Channel).

SPKR

Speaker Drive. Output of internal timer/counter 2.

Serial IRQ

Signal Name

Pin #

I/O

Signal Description

SERIRQ

Serial IRQ (Rx68[3] = 1 and Rx74[6] = 0)

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