s5920 Applied Micro Circuits Corporation (AMCC), s5920 Datasheet - Page 148

• Manufacturer Part Number: s5920
• Description: Pci Product
• Manufacturer: Applied Micro Circuits Corporation (AMCC)

S5920 – PCI Product: Pass-Thru Operation
(disconnect, but with no data transfer), the read data is
held in the FIFO until the master comes back for it. In
this case, the Retry Flush Enb has no effect. The PCI
2.1 Specification states that the master must come
back if it receives a retry.
Write FIFO Mode indicates what to do in the event that
a full FIFO is detected during a PCI write transfer. If
low, the S5920 will perform an immediate disconnect,
thus freeing up the PCI bus for other transfers. The ini-
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tiator will have to come back to complete the data
transfer, after which time the FIFO should no longer be
full. If Write FIFO Mode is high, the S5920 will deas-
sert TRDY#, and allow for either another FIFO location
to become available (as the Add-On has read a
DWORD), or wait for the Target Latency to expire (8
clocks from previous data phase), thus initiating a dis-
connect. This will allow for the Add-on device to
“catch-up” without losing the burst.
Revision 1.02 – April 12, 2007
Data Book
DS1596
148