CHAPTER 5 BBR
Preliminary User's Manual A14874EJ3V0UM
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5.3 Retry Function
The retry function, which repeats read or write processing according to a retry request signal (VPRETR) from a
peripheral macro on the NPB, is used in situations such as when the data setup time is insufficient.
If a high-level signal is being input to the VPRETR and VPDACT pins at the falling edge of the VPSTB signal, the
VPSTB signal rises again and the read or write operation is repeated.
Figure 5-7. Retry Function
Address
Data
Address
VPSTB (Output)
VPRETR (Input)
VPDACT (Input)
VPA13 to VPA0
(Output)
VPDO15 to VPDO0
(Output)
Read
Write
1 clock
Note
1 clock
Note
Data
VPDI15 to VPDI0
(Input)
VPWRITE (Output)
Data
Note
This is the same width as one VBCLK clock.
Remark
O mark: Sampling timing
:
Arbitrary input level
