w83628f Winbond Electronics Corp America, w83628f Datasheet - Page 9

• Manufacturer Part Number: w83628f
• Description: Pci To Isa Bridge Set
• Manufacturer: Winbond Electronics Corp America

4.1.1 PCI Interface, contiuned
7.1.2 Control Logic and Handshaking Signals
FRAME#
IDSEL
STOP#
IRDY#
TRDY#
DEVSEL#
SERR#
PAR
PCIRST#
HS[2:0]
ISOLATE#
NOGO
SYMBOL
SYMBOL
112-
PIN
PIN
114
40
29
39
41
42
43
45
49
71
72
76
I/O 24tp3
I/O 12tp3
I/O 12tp3
I/O 12tp3
I/O 12tp3
I/O 12tp3
OD 12
I/O 12
I/O
IN t
IN t
I/O
IN t
IN t
Frame Signal. FRAME# is driven by the current PCI bus master
to indicate the beginning and duration of an access.
Initialization Device Select. IDSEL is used as a chip select
during configuration read and write transactions. This signal
should be externally tied to one of the upper 21 address signals.
Bus Stop#. STOP# indicates the current target is requesting the
master to stop the current PCI bus transaction.
Initiator Ready. IRDY# indicates the initiating agent ability to
complete the current data phase of the PCI bus transaction.
Target Ready. TRDY# indicates the target agent’s ability to
complete the current data phase of the PCI bus transaction.
Device Select. W83628F drives DEVSEL# to indicate that it is
the target of the current PCI bus transaction. W83628F uses
subtractive decoding and the NOGO protocol to claim PCI
transactions.
System Error. SERR# can be pulsed active by any PCI agent
that detects a system error condition.
Parity Signal. W83628F generates even parity across AD[31:0]
and C/BE[3:0]#.
PCI Reset. W83628F receives PCIRST# as a reset from the PCI
Bus.
Handshaking Signals. HS[2:0] connected to W83629D for PCI
to ISA SET handshaking signals.
HS1 is handshaking Signal 1, this pin weak pulled-down
during PCIRST# is asserted, and apply a pull-up
resistor(4.7Kohm) to this pin disables ISA bridge subtraction
decoder.
Isolation Control Input. Isolate# is an active low signal by user
programming to control the W83628F all output signals to
Isolation and Tri-state.
NOGO, This signal indicates which master initiated the current
transaction and also indicates whether or not the current bus
cycle is targeted for the ISA bus. This signal is a point-to-point
connection between PCI HOST Bridge and W83628F.
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W83628F & W83629D
FUNCTION
FUNCTION
Publication Release Date: May 18, 2005
Revision A1