A54SX16-2 ACTEL [Actel Corporation], A54SX16-2 Datasheet
A54SX16-2
Manufacturer Part Number
A54SX16-2
Description
PCI Arbiter Core
Manufacturer
ACTEL [Actel Corporation]
Datasheet
1.A54SX16-2.pdf
(4 pages)
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PCI Arbiter Core
Fe a t ur es
• Support for up to Five PCI Bus Masters
• Support for Two Arbitration Schemes
• Support for Bus Parking
• Hidden Bus Arbitration
• Interface with 33 MHz and 66 MHz PCI Systems
• Implementation in Actel’s SX, SX-A, ProASIC and
• Synthesizable VHDL Source Code
• Device Utilization
G en er al D e sc r i p t i on
The Arbiter core is used to efficiently manage access to a
PCI bus that is shared by several masters. Access to the PCI
bus is automatically determined by the individual priorities
of each master.
Figure 2 • Top-Level Interface of the PCI Bus Initiators with the Arbiter
J an u a r y 2 0 0 2
© 2002 Actel Corporation
– Pure Rotation
– Fair Rotation
ProASIC
– SX/SX-A 100-150 Modules
– ProASIC/ProASIC
PLUS
PCI Device 0
Families
PCI Device 1
PLUS
124-135 Tiles
REQn0
GNTn0
REQn1
GNTn1
RSTn
CLK
GNTn2
PCI Device 2
PCI Arbiter
In the most common application, customers use an
embedded processor as the master with highest priority and
a pure-rotation arbitration scheme among other PCI bus
masters. The networking and telecom markets are the
targets for this macro.
I m p l em e n t at i on
At any given time, more than one PCI bus initiator (Master)
device may request use of the PCI bus by asserting its
specific request signal (REQn). The Arbiter determines
which PCI bus initiator controls the PCI bus by asserting
that device’s specific grant signal (GNTn).
the PCI Arbiter Core interface signals and
illustrates the relationship of the PCI bus initiator devices
with the Arbiter.
Figure 1 • PCI Arbiter Core Interface Signals
REQn2
REGn(4:0)
PCI_CLK
FRAMEn
FRAMEn
IRDYn
IRDYn
RSTn
GNTn3
REQn3
GNTn4
REQn4
PCI Device 3
PCI Device 4
Figure 1
GNTn(4:0)
Figure 2
v 4 . 0
shows
1
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A54SX16-2 Summary of contents
Page 1
PCI Arbiter Core • Support for up to Five PCI Bus Masters • Support for Two Arbitration Schemes – Pure Rotation – Fair Rotation • Support for Bus Parking • Hidden Bus Arbitration • Interface ...
Page 2
che m es Pure rotation is a turn-based method that allows each bus master one transaction in turn if multiple masters are requesting the bus simultaneously. If only one master requests the bus, ...
Page 3
... Open the file “arb_wrp.vhd” in the “/vhdl/src” directory and set the constant ALGORITHM to a one. Table 1 • Utilization and Performance Statistics Combinatorial Modules A54SX16-2 84 APA750 135 5. Compile the macro and the test bench. Type the following command at the prompt: do compall ...
Page 4
Actel and the Actel logo are registered trademarks of Actel Corporation. All other trademarks are the property of their owners. Actel Europe Ltd. Maxfli Court, Riverside Way Camberley, Surrey GU15 3YL United Kingdom Tel: +44-(0)1276 401450 Fax: +44-(0)1276 401490 http://www.actel.com ...