参数资料
型号: DS3131
厂商: MAXIM INTEGRATED PRODUCTS INC
元件分类: Telecom IC:Other
英文描述: SPECIALTY TELECOM CIRCUIT, PBGA256
封装: 27 X 27 MM, PLASTIC, BGA-256
文件页数: 32/174页
文件大小: 1261K
代理商: DS3131
DS3131
127 of 174
10.1.8
PCI Fast Back-to-Back
Fast back-to-back transactions are two consecutive bus transactions without the usually required idle
cycle (PFRAME and PIRDY deasserted) between them. This can only occur when there is a guarantee
that there is not any contention on the signal lines. The PCI specification allows two types of fast back-
to-back transactions—those that access the same agent (Type 1) and those that do not (Type 2).
Figure 10-9 shows an example of a fast back-to-back transaction where no idle cycle exists. As a bus
master, BoSS is not capable of performing a Type 2 access. As a target, it can accept both types of fast
back-to-back transactions.
Figure 10-9. PCI Fast Back-To-Back
12
3
4
5678910
data #1
Address
CMD
BE #1
PCLK
PFRAME
PAD
PCBE
PIRDY
PTRDY
PDEVSEL
data #2
BE #2
Address
data #1
CMD
BE #1
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