Cypress DCT-1D Betriebsanweisung Seite 75

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Appendix B
The Wishbone specification
B.1 Introduction
The Wishbone specification basically dictates the interfaces and how they should behave. The
method of connecting the interfaces to each other is very much up to the designer. This chapter
contains a brief explanation of the Wishbone specification (which consists of approximately
140 pages). More information can be found in the official specification [9]. Some rules from
the specification are cited in the following text.
SYSCON
Wishbone Master
Wishbone Slave
CLK_I
ADR_O
DAT_O
DAT_I
WE_O
SEL_O
STB_O
CYC_O
ACK_I
CTI_O
BTE_O
RST_I RST_I
CLK_I
ADR_I
DAT_I
DAT_O
WE_I
SEL_I
STB_I
CYC_I
ACK_O
CTI_I
BTE_I
ERR_I ERR_O
Figure B.1: Direct connection of Wishbone master and slave.
The interface specification can be used for connecting two cores directly just as well as it
can be used for connecting several cores through some kind of bus. Fig. B.1 shows a direct
connection of a master and a slave. This is the typical connection referred to in the timing
diagrams later.
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