Rev. 1.0, 09/01, page 116 of 904
6.3.4
Read Strobe Timing Control Register (RDNCR)
RDNCR selects the read strobe signal (
5'
) negation timing in a basic bus interface read access.
Bit
Bit Name
Initial Value
R/W
Description
7
6
5
4
3
2
1
0
RDN7
RDN6
RDN5
RDN4
RDN3
RDN2
RDN1
RDN0
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Read Strobe Timing Control 7 to 0
These bits set the negation timing of the read
strobe in a corresponding area read access.
As shown in figure 6.2, the read strobe for an
area for which the RDNn bit is set to 1 is
negated one half-state earlier than that for an
area for which the RDNn bit is cleared to 0. The
read data setup and hold time specifications are
also one half-state earlier.
0: In an area n read access, the
5'
is negated
at the end of the read cycle
1: In an area n read access, the
5'
is negated
one half-state before the end of the read cycle
(n = 7 to 0)
Bus cycle
T
1
T
2
Data
Data
RDNn = 0
RDNn = 1
T
3
Figure 6.2 Read Strobe Negation Timing (Example of 3-State Access Space)
Содержание H8S/2376 F-ZTAT
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