MT90883 Zarlink Semiconductor, MT90883 Datasheet - Page 71

• Manufacturer Part Number: MT90883
• Description: (MT90880 - MT90883) TDM to Packet Processors
• Manufacturer: Zarlink Semiconductor

6.10.6
The MT9088x signals pci_serr# and pci_inta# do not behave as open drain. Signals pci_serr# and pci_inta# should
behave as open drain. The following external circuitry should be used, so that the board on which the MT9088x is
placed, is compliant with the PCI specifications. Note any other circuitry such as termination resistors, pull-up
resistors, etc. are not shown.
6.11
The MT9088x contains a DMA Controller, automating transfer of data packets between the CPU system
memory and the MT9088x's external packet memory (Figure 32). This can be used to send packets from the
CPU into the packet network, and to direct packets received from the network to the CPU.
DMA Controller
Open Drain Circuitry
MT9088x
Figure 31 - pci_serr#, pci_inta# Open Drain Circuitry
Figure 32 - DMA Transfer to/from System Memory
pci_serr#
pci_inta#
(AB24)
(AF19)
Host CPU
MT90880
Bridge
PCI
Zarlink Semiconductor Inc.
MT90880/1/2/3
DMA transfer
PCI Bus
71
External packet
memory
memory
System
VDD33
Buffer
Quad
Open
Drain
PCI Backplane
(3.3V)
to
Data Sheet