Nec Network Controller uPD98502 Manual de usuario Pagina 370

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Preliminary User’s Manual S15543EJ1V0UM
CHAPTER 7 PCI CONTROLLER
7.1 Overview
The PCI Controller supports both NIC mode and Host mode. With the NIC mode, the PCI Controller does not issue
configuration cycle and the arbitration function is not enabled. With the Host mode, the PCI Controller can issue
configuration cycle and the arbitration function is enabled. Futures of the PCI Controller are as follows.
32-bit PCI Interface
33-MHz PCI frequency capable
Compliant to PCI Local Bus Specification Rev.2.2
Compliant to PCI bus Power Management Interface Rev.1.1
Supports up to 16-word burst access
Supports posted write function
Supports Delayed/Non Delayed read/write cycle
Implements PCI bus arbiter that supports up to 4 external PCI-master devices at Host-mode
Figure 7-1. The PCI Controller Block Diagram
PCI Slave
IBUS Master
PCI
Master
IBUS Slave
RegistersFIFO FIFO FIFO FIFO
P2I
Control
I2P
Control
Data Flow
Control
PCI
Arbiter
Idle
Control
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