4 arbitration signals, Table 3.5 arbitration signals, Arbitration signals – Avago Technologies LSI53C896 User Manual
Page 96
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Signal Descriptions
Version 3.3
Copyright © 1998–2003 by LSI Logic Corporation. All rights reserved.
3.2.4 Arbitration Signals
describes the signals for the Arbitration Signals group.
STOP/
R2
S/T/S
16 mA
PCI
Stop indicates that the selected target is requesting the
master to stop the current transaction.
DEVSEL/
R1
S/T/S
16 mA
PCI
Device Select indicates that the driving device has
decoded its address as the target of the current access. As
an input, it indicates to a master whether any device on the
bus has been selected.
IDSEL
L3
I
N/A
Initialization Device Select is used as a chip select in
place of the upper 24 address lines during configuration
read and write transactions.
Table 3.4
Interface Control Signals (Cont.)
Name
Bump
Type
Strength
Description
Table 3.5
Arbitration Signals
Name
Bump
Type
Strength
Description
REQ/
H2
O
16 mA
PCI
Request indicates to the system arbiter that this agent
desires use of the PCI bus. This is a point-to-point signal.
Both SCSI functions share the REQ/ signal.
GNT/
H4
I
N/A
Grant indicates to the agent that access to the PCI bus has
been granted. This is a point-to-point signal. Both SCSI
functions share the GNT/ signal.