VT8601 Via, VT8601 Datasheet - Page 23

• Manufacturer Part Number: VT8601
• Description: Slot-1 / Socket-370 PCI North Bridge
• Manufacturer: Via

Signal Name
AD[31:0]
CBE[3:0]#
PAR
FRAME#
IRDY#
TRDY#
STOP#
DEVSEL#
LOCK#
SERR#
PREQ#
PGNT#
REQ[7:0]#
GNT[7:0]#
INTA#
Note: Clocking of the PCI interface is performed with PCLK; see the clock pin group at the end of the pin descriptions section for
Revision 1.3 September 8, 1999
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descriptions of the clock input pins.
:H &
:H &R R QQHFW
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AE1, AD3, AD2, AE2,
AD1, AC3, AC2, AF2,
AD4, AE4, AD5, AC5
AE3, AF3, AF4, AB5
AD7, AD9, AB11,
see pin list
AB10
AC10
AD10
AC15
AD15
AF12
AE10
AF10
Pin #
AE9
AB9
AE5
W5
I/O
IO
IO
IO
IO
IO
IO
IO
IO
IO
IO
O
O
O
I
I
Signal Description
Address/Data Bus. The standard PCI address and data lines. The address is
driven with FRAME# assertion and data is driven or received in following
cycles.
Command/Byte Enables.
Byte enables corresponding to supplied or requested data are driven on
following clocks.
Parity. A single parity bit is provided over AD[31:0] and C/BE[3:0].
Frame. Assertion indicates the address phase of a PCI transfer. Negation
indicates that one more data transfer is desired by the cycle initiator. 10K
pullup to VCC3.
Initiator Ready. Asserted when initiator is ready for data transfer. 10K
pullup to VCC3.
Target Ready. Asserted when target is ready for data transfer. 10K pullup to
VCC3.
Stop.
transaction. 10K pullup to VCC3.
Device Select. This signal is driven by the ProMedia when a PCI initiator is
attempting to access main memory. It is an input when the ProMedia is acting
as a PCI initiator. 10K pullup to VCC3.
Lock. Used to establish, maintain, and release resource lock. 10K
VCC3.
System Error. The ProMedia will pulse this signal when it detects a system
error condition (10K pullup to VCC3).
South Bridge Request. This signal comes from the South Bridge. PREQ# is
the South Bridge request for the PCI bus. 10K pullup to VCC3.
South Bridge Grant. This signal driven by the ProMedia to grant PCI access
to the South Bridge. 10K pullup to VCC3.
PCI Master Request. PCI master requests for use of the PCI bus. 2.2K
pullup to VCC5.
PCI Master Grant. Permission is given to the master to use the PCI bus.
2.2K pullup to VCC3.
PCI Interrupt Out. INTA# is an asynchronous active low output used to
signal an event that requires handling. It is driven by the integrated graphics
controller.
PCI Bus Interface
Asserted by the target to request the master to stop the current
-17-
Commands are driven with FRAME# assertion.
VT8601 Apollo ProMedia
pullup to
Pinouts