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DS31256 bảng dữ liệu(PDF) 136 Page - Maxim Integrated Products

tên linh kiện DS31256
Giải thích chi tiết về linh kiện  256-Channel, High-Throughput HDLC Controller
PDF  183 Pages
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DS31256 bảng dữ liệu(HTML) 136 Page - Maxim Integrated Products

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DS31256 256-Channel, High-Throughput HDLC Controller
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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, the DS31256 cannot perform 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
data #2
BE #2
BE #2
Address
data #1
CMD
BE #1



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