September 2003
Intermediate to advanced
1120 pages
23h 44m
English
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Infinite Flow Control Advertisement
PCI Express defines an infinite Flow Control credit value. A device that advertises infinite Flow Control credits need not send Flow Control Update packets following initialization and the transmitter will never be blocked from sending transactions. During flow control initialization, a device advertises “infinite” credits by delivering a zero in the credit field of the FC_INIT1 DLLP.
Who Advertises Infinite Flow Control Credits?
It's interesting to note that the minimum Flow Control credits that must be advertised includes infinite credits for completion transactions in certain situations. See Table 7-1 on page 303. These requirements involve devices that originate requests for which completions are expected ...
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