Pcie packet type

posted non-posted completion

Type	Cmd wo/data	Cmd w/data
completion	cpl	cpld
posted	msg	mwt, msgd
non-posted	mrd, iord, cfgrd	iowt, cfgwt, atomics

cpl > non-posted > posted

• cplv = always on
• non-posted =
• posted =

転送長が分からない段階でのクレジット予測。

data credits 16Bytes = 4dw x 4 = 128bit

header 4dw

maxpayload = 256Bの場合、16credits.

1 ctedit 以上は、cpld, mwtの2つ？

ordering